Buffer busy waits
Hi,
Version : Oracle 9i
I am getting buffer busy waits on some tables. Will increase in inittrans & pctfree of those tables reduce buffer busy waits?
Tablespace is having segment space mgmt auto & extent management local.
cursor_sharing is similar.
Users are not experiencing any problem.Is there any problem other than this in statspack report?
STATSPACK report for
DB Name DB Id Instance Inst Num Release Cluster Host
AHD 3712247982 ahd 1 9.2.0.1.0 NO SBGSDPRI
Snap Id Snap Time Sessions Curs/Sess Comment
Begin Snap: 20 13-Feb-07 14:48:35 33 9.9
End Snap: 21 13-Feb-07 15:12:19 34 10.4
Elapsed: 23.73 (mins)
Cache Sizes (end)
~~~~~~~~~~~~~~~~~
Buffer Cache: 656M Std Block Size: 8K
Shared Pool Size: 152M Log Buffer: 768K
Load Profile
~~~~~~~~~~~~ Per Second Per Transaction
Redo size: 5,960.83 2,761.29
Logical reads: 2,376.85 1,101.05
Block changes: 35.48 16.44
Physical reads: 97.56 45.20
Physical writes: 1.15 0.53
User calls: 92.63 42.91
Parses: 20.00 9.27
Hard parses: 0.29 0.13
Sorts: 4.80 2.22
Logons: 0.01 0.00
Executes: 23.14 10.72
Transactions: 2.16
% Blocks changed per Read: 1.49 Recursive Call %: 14.69
Rollback per transaction %: 0.00 Rows per Sort: 472.64
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.65 Redo NoWait %: 100.00
Buffer Hit %: 95.90 In-memory Sort %: 100.00
Library Hit %: 99.15 Soft Parse %: 98.55
Execute to Parse %: 13.57 Latch Hit %: 99.70
Parse CPU to Parse Elapsd %: 90.83 % Non-Parse CPU: 96.58
Shared Pool Statistics Begin End
Memory Usage %: 84.68 84.76
% SQL with executions>1: 77.32 79.22
% Memory for SQL w/exec>1: 90.74 92.81
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
CPU time 125 54.23
db file sequential read 83,110 69 30.14
db file scattered read 23,196 27 11.75
buffer busy waits 11,760 6 2.42
log file sync 3,078 1 .45
Wait Events for DB: AHD Instance: ahd Snaps: 20 -21
-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
db file sequential read 83,110 0 69 1 27.0
db file scattered read 23,196 0 27 1 7.5
buffer busy waits 11,760 0 6 0 3.8
log file sync 3,078 0 1 0 1.0
log file parallel write 5,216 4,841 1 0 1.7
control file sequential read 1,390 0 1 1 0.5
control file parallel write 462 0 0 1 0.2
db file parallel write 672 336 0 0 0.2
latch free 54 24 0 2 0.0
SQL*Net more data to client 1,026 0 0 0 0.3
LGWR wait for redo copy 12 0 0 0 0.0
SQL*Net message from client 131,863 0 22,857 173 42.9
virtual circuit status 48 48 1,497 31188 0.0
wakeup time manager 45 45 1,446 32123 0.0
SQL*Net message to client 131,864 0 0 0 42.9
SQL*Net more data from clien 27 0 0 0 0.0
Background Wait Events for DB: AHD Instance: ahd Snaps: 20 -21
-> ordered by wait time desc, waits desc (idle events last)
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
log file parallel write 5,216 4,841 1 0 1.7
control file parallel write 462 0 0 1 0.2
control file sequential read 184 0 0 2 0.1
db file parallel write 672 336 0 0 0.2
log file sync 24 0 0 0 0.0
db file sequential read 1 0 0 8 0.0
LGWR wait for redo copy 12 0 0 0 0.0
rdbms ipc message 12,386 7,345 10,752 868 4.0
SQL*Net message from client 384 0 1,498 3901 0.1
smon timer 4 4 1,229 ###### 0.0
SQL*Net message to client 384 0 0 0 0.1
SQL ordered by Gets for DB: AHD Instance: ahd Snaps: 20 -21
-> End Buffer Gets Threshold: 10000
-> Note that resources reported for PL/SQL includes the resources used by
all SQL statements called within the PL/SQL code. As individual SQL
statements are also reported, it is possible and valid for the summed
total % to exceed 100
CPU Elapsd
Buffer Gets Executions Gets per Exec %Total Time (s) Time (s) Hash Value
1,269,773 52 24,418.7 37.5 27.03 76.26 3370382957
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1" ) AND ( (
381,394 44 8,668.0 11.3 21.30 22.94 3653016280
SELECT count(*) FROM call_req, ctct, loc, site, z_zo, z_lho WHER
E ( call_req.customer = ctct.id AND ctct.c_l_id = loc.id AND l
oc.l_si_id = site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo
lhoid = z_lho.id AND z_lho.lho_name LIKE :"SYS_B_0" AND cal
l_req.active_flag = :"SYS_B_1" ) AND ( ( call_req.group_id != :"
239,582 10 23,958.2 7.1 5.95 17.44 1650906216
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_0" ) AND ( ( call_req.group_id != :"SYS_B_1" ) and
146,016 9 16,224.0 4.3 2.58 12.01 977739309
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.group_id IN ( SELECT id FROM ctct WHERE id = :"SYS_B_00" O
R id = :"SYS_B_01" OR id = :"SYS_B_02" OR id = :"SYS_B_03" OR id
= :"SYS_B_04" OR id = :"SYS_B_05" OR id = :"SYS_B_06" OR id = :
"SYS_B_07" OR id = :"SYS_B_08" OR id = :"SYS_B_09" OR id = :"SYS
117,569 7 16,795.6 3.5 0.52 0.52 1972089848
SELECT call_req.open_date, call_req.id FROM call_req, ctct WHERE
( call_req.status = :"SYS_B_00" AND call_req.group_id = ctct.id
AND ctct.c_last_name LIKE :"SYS_B_01" AND ( call_req.assigne
e IS NULL ) ) AND ( call_req.group_id IN ( SELECT id FROM ctct W
HERE id = :"SYS_B_02" OR id = :"SYS_B_03" OR id = :"SYS_B_04" OR
100,276 4 25,069.0 3.0 2.77 6.95 771782876
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho, ctct cn01 WHERE ( call_req.customer = ctct.i
d AND ctct.c_l_id = loc.id AND loc.l_si_id = site.id AND site
.z_si_zo_id = z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.
lho_name LIKE :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1"
95,832 4 23,958.0 2.8 2.13 3.80 1755292198
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_00" AND call_req.active_flag = :"SYS_B_01" AND ( ca
86,680 10 8,668.0 2.6 7.69 8.21 3407388950
SQL ordered by Gets for DB: AHD Instance: ahd Snaps: 20 -21
-> End Buffer Gets Threshold: 10000
-> Note that resources reported for PL/SQL includes the resources used by
all SQL statements called within the PL/SQL code. As individual SQL
statements are also reported, it is possible and valid for the summed
total % to exceed 100
CPU Elapsd
Buffer Gets Executions Gets per Exec %Total Time (s) Time (s) Hash Value
SELECT count(*) FROM call_req, ctct, loc, site, z_zo, z_lho WHER
E ( call_req.customer = ctct.id AND ctct.c_l_id = loc.id AND l
oc.l_si_id = site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo
lhoid = z_lho.id AND z_lho.lho_name LIKE :"SYS_B_0" ) AND (
( call_req.group_id != :"SYS_B_1" ) and ( call_req.group_id !=
71,839 3 23,946.3 2.1 2.73 6.07 1599404397
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo WHERE ( call_req.active_flag = :"SYS_B_0" AND call_r
eq.customer = ctct.id AND ctct.c_l_id = loc.id AND loc.l_si_id
= site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo_name LIK
E :"SYS_B_1" ) AND ( ( call_req.group_id != :"SYS_B_2" ) and (
60,507 9 6,723.0 1.8 1.47 1.49 632450130
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho, ctct cn01 WHERE ( call_req.customer = ctct.i
d AND ctct.c_l_id = loc.id AND loc.l_si_id = site.id AND site
.z_si_zo_id = z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.
lho_name LIKE :"SYS_B_0" AND call_req.status = :"SYS_B_1" AND
57,682 191 302.0 1.7 3.48 3.52 484128938
SELECT cnote.posted_date, cnote.text FROM cnote WHERE ( ( cnote.
loc_id = :"SYS_B_0" ) OR cnote.loc_id IS NULL ) AND ( cnote.inte
rnal IS NULL OR cnote.internal != :"SYS_B_1" ) ORDER BY cnote.p
osted_date DESC
52,146 3 17,382.0 1.5 1.22 3.60 930247717
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.group_id IN ( SELECT id FROM ctct WHERE id = :"SYS_B_00" O
R id = :"SYS_B_01" OR id = :"SYS_B_02" OR id = :"SYS_B_03" OR id
= :"SYS_B_04" OR id = :"SYS_B_05" OR id = :"SYS_B_06" OR id = :
"SYS_B_07" OR id = :"SYS_B_08" OR id = :"SYS_B_09" OR id = :"SYS
43,534 4 10,883.5 1.3 2.05 2.10 2363733805
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho, prob_ctg, ctct cn01 WHERE ( call_req.custome
r = ctct.id AND ctct.c_l_id = loc.id AND loc.l_si_id = site.id
AND site.z_si_zo_id = z_zo.id AND z_zo.zo_lho_id = z_lho.id A
ND z_lho.lho_name LIKE :"SYS_B_00" AND call_req.active_flag =
SQL ordered by Reads for DB: AHD Instance: ahd Snaps: 20 -21
-> End Disk Reads Threshold: 1000
CPU Elapsd
Physical Reads Executions Reads per Exec %Total Time (s) Time (s) Hash Value
81,653 52 1,570.3 58.8 27.03 76.26 3370382957
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1" ) AND ( (
15,402 10 1,540.2 11.1 5.95 17.44 1650906216
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_0" ) AND ( ( call_req.group_id != :"SYS_B_1" ) and
13,371 9 1,485.7 9.6 2.58 12.01 977739309
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.group_id IN ( SELECT id FROM ctct WHERE id = :"SYS_B_00" O
R id = :"SYS_B_01" OR id = :"SYS_B_02" OR id = :"SYS_B_03" OR id
= :"SYS_B_04" OR id = :"SYS_B_05" OR id = :"SYS_B_06" OR id = :
"SYS_B_07" OR id = :"SYS_B_08" OR id = :"SYS_B_09" OR id = :"SYS
6,157 4 1,539.3 4.4 2.77 6.95 771782876
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho, ctct cn01 WHERE ( call_req.customer = ctct.i
d AND ctct.c_l_id = loc.id AND loc.l_si_id = site.id AND site
.z_si_zo_id = z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.
lho_name LIKE :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1"
6,152 4 1,538.0 4.4 2.13 3.80 1755292198
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_00" AND call_req.active_flag = :"SYS_B_01" AND ( ca
4,622 3 1,540.7 3.3 2.73 6.07 1599404397
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo WHERE ( call_req.active_flag = :"SYS_B_0" AND call_r
eq.customer = ctct.id AND ctct.c_l_id = loc.id AND loc.l_si_id
= site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo_name LIK
E :"SYS_B_1" ) AND ( ( call_req.group_id != :"SYS_B_2" ) and (
2,982 3 994.0 2.1 1.22 3.60 930247717
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.group_id IN ( SELECT id FROM ctct WHERE id = :"SYS_B_00" O
R id = :"SYS_B_01" OR id = :"SYS_B_02" OR id = :"SYS_B_03" OR id
= :"SYS_B_04" OR id = :"SYS_B_05" OR id = :"SYS_B_06" OR id = :
"SYS_B_07" OR id = :"SYS_B_08" OR id = :"SYS_B_09" OR id = :"SYS
1,566 44 35.6 1.1 21.30 22.94 3653016280
SELECT count(*) FROM call_req, ctct, loc, site, z_zo, z_lho WHER
E ( call_req.customer = ctct.id AND ctct.c_l_id = loc.id AND l
oc.l_si_id = site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo
_lho_id = z_lho.id AND z_lho.lho_name LIKE :"SYS_B_0" AND cal
SQL ordered by Reads for DB: AHD Instance: ahd Snaps: 20 -21
-> End Disk Reads Threshold: 1000
CPU Elapsd
Physical Reads Executions Reads per Exec %Total Time (s) Time (s) Hash Value
l_req.active_flag = :"SYS_B_1" ) AND ( ( call_req.group_id != :"
1,540 1 1,540.0 1.1 0.56 1.64 2582352638
SELECT call_req.open_date, call_req.id FROM call_req, ctct, loc,
site, z_zo, z_lho WHERE ( call_req.customer = ctct.id AND ctct
.c_l_id = loc.id AND loc.l_si_id = site.id AND site.z_si_zo_id
= z_zo.id AND z_zo.zo_lho_id = z_lho.id AND z_lho.lho_name L
IKE :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1" AND ( call
1,106 2 553.0 0.8 1.25 3.01 548248759
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( ( c
all_req.assignee IS NOT NULL OR call_req.group_id IS NOT NULL )
AND ( call_req.type = :"SYS_B_00" OR call_req.type = :"SYS_B_01"
OR call_req.type IS NULL ) AND call_req.active_flag = :"SYS_B_0
2" ) AND ( call_req.group_id IN ( SELECT id FROM ctct WHERE id =
875 2 437.5 0.6 0.94 2.95 1195215130
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( ( c
all_req.assignee IS NULL AND call_req.group_id IS NULL ) AND ( c
all_req.type = :"SYS_B_00" OR call_req.type = :"SYS_B_01" OR cal
l_req.type IS NULL ) AND call_req.active_flag = :"SYS_B_02" ) AN
D ( call_req.group_id IN ( SELECT id FROM ctct WHERE id = :"SYS_
473 1 473.0 0.3 1.80 5.57 3376831664
BEGIN statspack.snap; END;
357 10 35.7 0.3 7.69 8.21 3407388950
SELECT count(*) FROM call_req, ctct, loc, site, z_zo, z_lho WHER
E ( call_req.customer = ctct.id AND ctct.c_l_id = loc.id AND l
oc.l_si_id = site.id AND site.z_si_zo_id = z_zo.id AND z_zo.zo
_lho_id = z_lho.id AND z_lho.lho_name LIKE :"SYS_B_0" ) AND (
( call_req.group_id != :"SYS_B_1" ) and ( call_req.group_id !=
177 5 35.4 0.1 1.81 2.08 920690862
SELECT ctct.c_last_name, ctct.c_first_name, ctct.c_middle_name,
ctct.c_public_phone, ctct.c_contact_num, ctct.c_org_id, ctct.c_l
_id, ctct.id FROM ctct, ct_ty WHERE ( ctct.c_ctp_id = ct_ty.id A
SQL ordered by Executions for DB: AHD Instance: ahd Snaps: 20 -21
-> End Executions Threshold: 100
CPU per Elap per
Executions Rows Processed Rows per Exec Exec (s) Exec (s) Hash Value
7,741 7,738 1.0 0.00 0.00 1060224445
SELECT grpmem.group_id , grpmem.manager_flag , grpmem.member , g
rpmem.notify_flag FROM grpmem WHERE grpmem.id = :"SYS_B_0"
2,459 2,459 1.0 0.00 0.00 3026674282
SELECT act_log.action_desc , act_log.analyst , act_log.call_req_
id , act_log.description , act_log.internal , act_log.knowledge_
session , act_log.knowledge_tool , act_log.last_mod_dt , act_log
.persid , act_log.system_time , act_log.time_spent , act_log.tim
e_stamp , act_log.type FROM act_log WHERE act_log.id = :"SYS_B_0
1,449 1,449 1.0 0.00 0.00 3299996875
SELECT att_evt.cancel_time , att_evt.event_tmpl , att_evt.fire_t
ime , att_evt.first_fire_time , att_evt.group_name , att_evt.las
t_mod_dt , att_evt.num_fire , att_evt.obj_id , att_evt.persid ,
att_evt.start_time , att_evt.status_flag , att_evt.user_smag , a
tt_evt.wait_time FROM att_evt WHERE att_evt.id = :"SYS_B_0"
1,336 1,336 1.0 0.00 0.00 3034229510
SELECT cr_prp.description , cr_prp.label , cr_prp.last_mod_by ,
cr_prp.last_mod_dt , cr_prp.owning_cr , cr_prp.persid , cr_prp.r
equired , cr_prp.sample , cr_prp.sequence , cr_prp.value FROM cr
prp WHERE crprp.id = :"SYS_B_0"
968 968 1.0 0.00 0.00 3460529092
select t.name, (select owner_instance from sys.aq$_queue_table_
affinities where table_objno = t.objno) from system.aq$_queue
_tables t where t.name = :1 and t.schema = :2 for update skip lo
cked
808 808 1.0 0.00 0.00 3346182257
SELECT call_req.active_flag , call_req.affected_rc , call_req.as
signee , call_req.call_back_date , call_req.call_back_flag , cal
l_req.category , call_req.change , call_req.charge_back_id , cal
l_req.close_date , call_req.created_via , call_req.customer , ca
ll_req.description , call_req.event_token , call_req.extern_ref
720 720 1.0 0.00 0.00 140137628
Module: Spotlight On Oracle, classic
SELECT DECODE(:b1,'BL','Buffer hash table instance lock','CF','C
ontrol file schema global enqueue lock','CI','Cross-instance fun
ction invocation instance lock','CS','Control file schema global
enqueue lock','CU','Cursor bind lock','DF','Data file instance
lock','DL','Direct loader parallel index create','DM','Mount/sta
718 718 1.0 0.00 0.00 4078915446
SELECT options.app_name, options.sym, options.id FROM options WH
ERE ( options.sym = :"SYS_B_0" ) AND ( options.del = :"SYS_B_1"
) ORDER BY options.app_name
634 634 1.0 0.00 0.00 1199698393
SELECT loc.alias , loc.del , loc.l_addr1 , loc.l_addr2 , loc.l_a
ddr3 , loc.l_addr4 , loc.l_addr5 , loc.l_addr6 , loc.l_details ,
loc.l_name , loc.l_si_id , loc.last_mod , loc.persid , loc.z_cb
SQL ordered by Executions for DB: AHD Instance: ahd Snaps: 20 -21
-> End Executions Threshold: 100
CPU per Elap per
Executions Rows Processed Rows per Exec Exec (s) Exec (s) Hash Value
l1 , loc.zcb_l2 , loc.z_cb_l3 , loc.z_l_code , loc.z_ro_code ,
loc.z_zo_code FROM loc WHERE loc.id = :"SYS_B_0"
531 208 0.4 0.00 0.00 800192270
SELECT lrel.l_persid, lrel.l_attr, lrel.l_sql, lrel.r_persid, lr
el.r_attr, lrel.r_sql, lrel.id FROM lrel WHERE lrel.l_persid = :
"SYS_B_0" and lrel.l_attr = :"SYS_B_1" ORDER BY lrel.l_persid ,
lrel.l_attr , lrel.l_sql
438 438 1.0 0.00 0.00 1317334374
Select PROPERTY_NAME,PROPERTY_VALUE,PROPERTY_TYPE from CI_PROPER
TIES where PROPERTY_NAME=:"SYS_B_0"
429 8,151 19.0 0.00 0.00 1976028604
SELECT cr_stat.sym, cr_stat.code FROM cr_stat WHERE cr_stat.del
= :"SYS_B_0" ORDER BY cr_stat.sym
383 383 1.0 0.00 0.00 2599265718
DELETE FROM anima WHERE id = :"SYS_B_0"
359 359 1.0 0.00 0.00 1719939797
DELETE FROM att_evt WHERE id = :"SYS_B_0"
337 337 1.0 0.00 0.00 3069423312
SELECT anima.a_act , anima.a_delta , anima.a_lock , anima.a_name
, anima.a_org , anima.a_string , anima.a_time , anima.t_method
, anima.t_persid , anima.t_type FROM anima WHERE anima.id = :"SY
S_B_0"
332 331 1.0 0.00 0.00 1549656119
SELECT crsq.id FROM crsq WHERE crsq.code = :"SYS_B_0"
315 315 1.0 0.00 0.00 1734736338
UPDATE cr_prp SET last_mod_by = :"SYS_B_0" , last_mod_dt = :"SYS
_B_1" WHERE id = :"SYS_B_2"
308 1,580 5.1 0.00 0.00 618252548
SELECT cr_prp.sequence, cr_prp.id FROM cr_prp WHERE cr_prp.ownin
g_cr = :"SYS_B_0" ORDER BY cr_prp.sequence
279 1,716 6.2 0.00 0.00 749386807
SELECT call_req.open_date, call_req.id FROM call_req WHERE call_
req.customer = :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1"
ORDER BY call_req.open_date DESC
277 277 1.0 0.00 0.00 321149819
INSERT INTO anima ( a_act, a_delta, a_lock, a_name, a_org, a_str
ing, a_time, t_method, t_persid, t_type, id ) VALUES ( :"SYS_B_
0" , :"SYS_B_1" , :"SYS_B_2" , :"SYS_B_3" , :"SYS_B_4" , nu
ll , :"SYS_B_5" , :"SYS_B_6" , :"SYS_B_7" , :"SYS_B_8" , :"
SQL ordered by Parse Calls for DB: AHD Instance: ahd Snaps: 20 -21
-> End Parse Calls Threshold: 1000
% Total
Parse Calls Executions Parses Hash Value
7,733 7,741 27.15 1060224445
SELECT grpmem.group_id , grpmem.manager_flag , grpmem.member , g
rpmem.notify_flag FROM grpmem WHERE grpmem.id = :"SYS_B_0"
2,459 2,459 8.63 3026674282
SELECT act_log.action_desc , act_log.analyst , act_log.call_req_
id , act_log.description , act_log.internal , act_log.knowledge_
session , act_log.knowledge_tool , act_log.last_mod_dt , act_log
.persid , act_log.system_time , act_log.time_spent , act_log.tim
e_stamp , act_log.type FROM act_log WHERE act_log.id = :"SYS_B_0
1,449 1,449 5.09 3299996875
SELECT att_evt.cancel_time , att_evt.event_tmpl , att_evt.fire_t
ime , att_evt.first_fire_time , att_evt.group_name , att_evt.las
t_mod_dt , att_evt.num_fire , att_evt.obj_id , att_evt.persid ,
att_evt.start_time , att_evt.status_flag , att_evt.user_smag , a
tt_evt.wait_time FROM att_evt WHERE att_evt.id = :"SYS_B_0"
1,336 1,336 4.69 3034229510
SELECT cr_prp.description , cr_prp.label , cr_prp.last_mod_by ,
cr_prp.last_mod_dt , cr_prp.owning_cr , cr_prp.persid , cr_prp.r
equired , cr_prp.sample , cr_prp.sequence , cr_prp.value FROM cr
prp WHERE crprp.id = :"SYS_B_0"
808 808 2.84 3346182257
SELECT call_req.active_flag , call_req.affected_rc , call_req.as
signee , call_req.call_back_date , call_req.call_back_flag , cal
l_req.category , call_req.change , call_req.charge_back_id , cal
l_req.close_date , call_req.created_via , call_req.customer , ca
ll_req.description , call_req.event_token , call_req.extern_ref
718 718 2.52 4078915446
SELECT options.app_name, options.sym, options.id FROM options WH
ERE ( options.sym = :"SYS_B_0" ) AND ( options.del = :"SYS_B_1"
) ORDER BY options.app_name
634 634 2.23 1199698393
SELECT loc.alias , loc.del , loc.l_addr1 , loc.l_addr2 , loc.l_a
ddr3 , loc.l_addr4 , loc.l_addr5 , loc.l_addr6 , loc.l_details ,
loc.l_name , loc.l_si_id , loc.last_mod , loc.persid , loc.z_cb
l1 , loc.zcb_l2 , loc.z_cb_l3 , loc.z_l_code , loc.z_ro_code ,
loc.z_zo_code FROM loc WHERE loc.id = :"SYS_B_0"
531 531 1.86 800192270
SELECT lrel.l_persid, lrel.l_attr, lrel.l_sql, lrel.r_persid, lr
el.r_attr, lrel.r_sql, lrel.id FROM lrel WHERE lrel.l_persid = :
"SYS_B_0" and lrel.l_attr = :"SYS_B_1" ORDER BY lrel.l_persid ,
lrel.l_attr , lrel.l_sql
438 438 1.54 1317334374
Select PROPERTY_NAME,PROPERTY_VALUE,PROPERTY_TYPE from CI_PROPER
TIES where PROPERTY_NAME=:"SYS_B_0"
429 429 1.51 1976028604
SQL ordered by Parse Calls for DB: AHD Instance: ahd Snaps: 20 -21
-> End Parse Calls Threshold: 1000
% Total
Parse Calls Executions Parses Hash Value
SELECT cr_stat.sym, cr_stat.code FROM cr_stat WHERE cr_stat.del
= :"SYS_B_0" ORDER BY cr_stat.sym
383 383 1.34 2599265718
DELETE FROM anima WHERE id = :"SYS_B_0"
359 359 1.26 1719939797
DELETE FROM att_evt WHERE id = :"SYS_B_0"
337 337 1.18 3069423312
SELECT anima.a_act , anima.a_delta , anima.a_lock , anima.a_name
, anima.a_org , anima.a_string , anima.a_time , anima.t_method
, anima.t_persid , anima.t_type FROM anima WHERE anima.id = :"SY
S_B_0"
330 332 1.16 1549656119
SELECT crsq.id FROM crsq WHERE crsq.code = :"SYS_B_0"
315 315 1.11 1734736338
UPDATE cr_prp SET last_mod_by = :"SYS_B_0" , last_mod_dt = :"SYS
_B_1" WHERE id = :"SYS_B_2"
308 308 1.08 618252548
SELECT cr_prp.sequence, cr_prp.id FROM cr_prp WHERE cr_prp.ownin
g_cr = :"SYS_B_0" ORDER BY cr_prp.sequence
277 277 0.97 321149819
INSERT INTO anima ( a_act, a_delta, a_lock, a_name, a_org, a_str
ing, a_time, t_method, t_persid, t_type, id ) VALUES ( :"SYS_B_
0" , :"SYS_B_1" , :"SYS_B_2" , :"SYS_B_3" , :"SYS_B_4" , nu
ll , :"SYS_B_5" , :"SYS_B_6" , :"SYS_B_7" , :"SYS_B_8" , :"
SYS_B_9" )
277 279 0.97 749386807
SELECT call_req.open_date, call_req.id FROM call_req WHERE call_
req.customer = :"SYS_B_0" AND call_req.active_flag = :"SYS_B_1"
ORDER BY call_req.open_date DESC
275 275 0.97 2816620377
INSERT INTO att_evt ( cancel_time, event_tmpl, fire_time, first_
fire_time, group_name, last_mod_dt, num_fire, obj_id, persid, st
art_time, status_flag, user_smag, wait_time, id ) VALUES ( null
, :"SYS_B_00" , :"SYS_B_01" , :"SYS_B_02" , :"SYS_B_03" ,
:"SYS_B_04" , :"SYS_B_05" , :"SYS_B_06" , :"SYS_B_07" , :"SY
269 269 0.94 3605948696
SELECT slatpl.del , slatpl.elapsed , slatpl.event , slatpl.last_
mod_by , slatpl.last_mod_dt , slatpl.object_type , slatpl.persid
, slatpl.service_type , slatpl.sym FROM slatpl WHERE slatpl.id
SQL ordered by Sharable Memory for DB: AHD Instance: ahd Snaps: 20 -21
-> End Sharable Memory Threshold: 1048576
Sharable Mem (b) Executions % Total Hash Value
23,912,520 231 13.6 139964375
SELECT anima.a_name, anima.t_persid, anima.t_method, anima.id FR
OM anima WHERE anima.t_persid LIKE :"SYS_B_0" ORDER BY anima.
a_name
18,314,292 26 10.4 380755726
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.ref_num LIKE :"SYS_B_00" ) AND ( call_req.group_id IN (
SELECT id FROM ctct WHERE id = :"SYS_B_01" OR id = :"SYS_B_02" O
R id = :"SYS_B_03" OR id = :"SYS_B_04" OR id = :"SYS_B_05" OR id
= :"SYS_B_06" OR id = :"SYS_B_07" OR id = :"SYS_B_08" OR id = :
12,365,844 107 7.0 1877135209
SELECT chg.open_date, chg.chg_ref_num, chg.id FROM chg WHERE ( c
hg.affected_contact = :"SYS_B_0" and chg.active_flag = :"SYS_B_1
" ) AND ( chg.affected_contact = :"SYS_B_2" ) ORDER BY chg.open
_date DESC
2,692,852 17 1.5 4181730075
SELECT ctct.c_last_name, ctct.c_first_name, ctct.c_middle_name,
ctct.c_public_phone, ctct.c_contact_num, ctct.c_org_id, ctct.c_l
_id, ctct.id FROM ctct, ct_ty WHERE ( ctct.c_last_name LIKE :"
SYS_B_0" AND ctct.c_ctp_id = ct_ty.id AND ct_ty.id = :"SYS_B_1"
AND ctct.del = :"SYS_B_2" AND ctct.id IN ( SELECT member FROM g
2,048,083 10 1.2 153455816
SELECT ctct.c_last_name, ctct.c_first_name, ctct.c_middle_name,
ctct.c_public_phone, ctct.c_contact_num, ctct.c_org_id, ctct.c_l
_id, ctct.id FROM ctct WHERE ( ctct.c_last_name LIKE :"SYS_B_0
" ) AND ( ( ctct.del = :"SYS_B_1" ) AND ( ctct.c_ctp_id = :"SYS_
B_2" AND ctct.alias = -:"SYS_B_3" ) ) ORDER BY ctct.c_last_name
1,653,628 3 0.9 1096419296
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.ref_num LIKE :"SYS_B_0" ) AND ( ( call_req.group_id IN (
SELECT group_id FROM grpmem WHERE member = :"SYS_B_1" ) ) or ca
ll_req.assignee = :"SYS_B_2" or call_req.customer = :"SYS_B_3" )
ORDER BY call_req.open_date DESC
SQL ordered by Version Count for DB: AHD Instance: ahd Snaps: 20 -21
-> End Version Count Threshold: 20
Version
Count Executions Hash Value
349 231 139964375
SELECT anima.a_name, anima.t_persid, anima.t_method, anima.id FR
OM anima WHERE anima.t_persid LIKE :"SYS_B_0" ORDER BY anima.
a_name
196 107 1877135209
SELECT chg.open_date, chg.chg_ref_num, chg.id FROM chg WHERE ( c
hg.affected_contact = :"SYS_B_0" and chg.active_flag = :"SYS_B_1
" ) AND ( chg.affected_contact = :"SYS_B_2" ) ORDER BY chg.open
_date DESC
127 26 380755726
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.ref_num LIKE :"SYS_B_00" ) AND ( call_req.group_id IN (
SELECT id FROM ctct WHERE id = :"SYS_B_01" OR id = :"SYS_B_02" O
R id = :"SYS_B_03" OR id = :"SYS_B_04" OR id = :"SYS_B_05" OR id
= :"SYS_B_06" OR id = :"SYS_B_07" OR id = :"SYS_B_08" OR id = :
36 17 4181730075
SELECT ctct.c_last_name, ctct.c_first_name, ctct.c_middle_name,
ctct.c_public_phone, ctct.c_contact_num, ctct.c_org_id, ctct.c_l
_id, ctct.id FROM ctct, ct_ty WHERE ( ctct.c_last_name LIKE :"
SYS_B_0" AND ctct.c_ctp_id = ct_ty.id AND ct_ty.id = :"SYS_B_1"
AND ctct.del = :"SYS_B_2" AND ctct.id IN ( SELECT member FROM g
33 10 153455816
SELECT ctct.c_last_name, ctct.c_first_name, ctct.c_middle_name,
ctct.c_public_phone, ctct.c_contact_num, ctct.c_org_id, ctct.c_l
_id, ctct.id FROM ctct WHERE ( ctct.c_last_name LIKE :"SYS_B_0
" ) AND ( ( ctct.del = :"SYS_B_1" ) AND ( ctct.c_ctp_id = :"SYS_
B_2" AND ctct.alias = -:"SYS_B_3" ) ) ORDER BY ctct.c_last_name
26 3 1096419296
SELECT call_req.open_date, call_req.id FROM call_req WHERE ( cal
l_req.ref_num LIKE :"SYS_B_0" ) AND ( ( call_req.group_id IN (
SELECT group_id FROM grpmem WHERE member = :"SYS_B_1" ) ) or ca
ll_req.assignee = :"SYS_B_2" or call_req.customer = :"SYS_B_3" )
ORDER BY call_req.open_date DESC
Instance Activity Stats for DB: AHD Instance: ahd Snaps: 20 -21
Statistic Total per Second per Trans
CPU used by this session 12,450 8.7 4.1
CPU used when call started 12,515 8.8 4.1
CR blocks created 53 0.0 0.0
DBWR buffers scanned 0 0.0 0.0
DBWR checkpoint buffers written 1,644 1.2 0.5
DBWR checkpoints 0 0.0 0.0
DBWR free buffers found 0 0.0 0.0
DBWR lru scans 0 0.0 0.0
DBWR make free requests 0 0.0 0.0
DBWR summed scan depth 0 0.0 0.0
DBWR transaction table writes 10 0.0 0.0
DBWR undo block writes 238 0.2 0.1
SQL*Net roundtrips to/from client 131,833 92.6 42.9
active txn count during cleanout 130 0.1 0.0
background checkpoints completed 0 0.0 0.0
background checkpoints started 0 0.0 0.0
background timeouts 2,161 1.5 0.7
branch node splits 0 0.0 0.0
buffer is not pinned count 3,147,925 2,210.6 1,024.1
buffer is pinned count 638,155 448.1 207.6
bytes received via SQL*Net from c 20,116,711 14,126.9 6,544.2
bytes sent via SQL*Net to client 33,961,169 23,849.1 11,047.9
calls to get snapshot scn: kcmgss 76,324 53.6 24.8
calls to kcmgas 6,266 4.4 2.0
calls to kcmgcs 110 0.1 0.0
change write time 25 0.0 0.0
cleanout - number of ktugct calls 145 0.1 0.1
cleanouts and rollbacks - consist 0 0.0 0.0
cleanouts only - consistent read 0 0.0 0.0
cluster key scan block gets 1,361 1.0 0.4
cluster key scans 1,146 0.8 0.4
commit cleanout failures: buffer 0 0.0 0.0
commit cleanout failures: callbac 3 0.0 0.0
commit cleanout failures: cannot 0 0.0 0.0
commit cleanouts 14,837 10.4 4.8
commit cleanouts successfully com 14,834 10.4 4.8
commit txn count during cleanout 106 0.1 0.0
consistent changes 2,123 1.5 0.7
consistent gets 3,336,864 2,343.3 1,085.5
consistent gets - examination 197,061 138.4 64.1
cursor authentications 71 0.1 0.0
data blocks consistent reads - un 2,123 1.5 0.7
db block changes 50,525 35.5 16.4
db block gets 47,774 33.6 15.5
deferred (CURRENT) block cleanout 7,940 5.6 2.6
dirty buffers inspected 0 0.0 0.0
enqueue conversions 29 0.0 0.0
enqueue releases 14,210 10.0 4.6
enqueue requests 14,210 10.0 4.6
enqueue waits 0 0.0 0.0
execute count 32,955 23.1 10.7
free buffer inspected 16 0.0 0.0
free buffer requested 140,283 98.5 45.6
hot buffers moved to head of LRU 950 0.7 0.3
immediate (CR) block cleanout app 0 0.0 0.0
immediate (CURRENT) block cleanou 2,804 2.0 0.9
Instance Activity Stats for DB: AHD Instance: ahd Snaps: 20 -21
Statistic Total per Second per Trans
index fast full scans (full) 157 0.1 0.1
index fetch by key 70,378 49.4 22.9
index scans kdiixs1 28,181 19.8 9.2
leaf node 90-10 splits 10 0.0 0.0
leaf node splits 76 0.1 0.0
logons cumulative 11 0.0 0.0
messages received 5,452 3.8 1.8
messages sent 5,452 3.8 1.8
no buffer to keep pinned count 0 0.0 0.0
no work - consistent read gets 3,085,481 2,166.8 1,003.7
opened cursors cumulative 4,561 3.2 1.5
parse count (failures) 0 0.0 0.0
parse count (hard) 412 0.3 0.1
parse count (total) 28,484 20.0 9.3
parse time cpu 426 0.3 0.1
parse time elapsed 469 0.3 0.2
physical reads 138,930 97.6 45.2
physical reads direct 0 0.0 0.0
physical writes 1,644 1.2 0.5
physical writes direct 0 0.0 0.0
physical writes non checkpoint 232 0.2 0.1
pinned buffers inspected 7 0.0 0.0
prefetched blocks 32,732 23.0 10.7
process last non-idle time 12,884,949,552 9,048,419.6 4,191,590.6
recursive calls 22,718 16.0 7.4
recursive cpu usage 226 0.2 0.1
redo blocks written 19,178 13.5 6.2
redo buffer allocation retries 0 0.0 0.0
redo entries 27,265 19.2 8.9
redo log space requests 0 0.0 0.0
redo log space wait time 0 0.0 0.0
redo size 8,488,216 5,960.8 2,761.3
redo synch time 74 0.1 0.0
redo synch writes 3,078 2.2 1.0
redo wastage 1,040,788 730.9 338.6
redo write time 75 0.1 0.0
redo writer latching time 0 0.0 0.0
redo writes 5,216 3.7 1.7
rollback changes - undo records a 6 0.0 0.0
rollbacks only - consistent read 233 0.2 0.1
rows fetched via callback 54,581 38.3 17.8
session connect time 12,884,949,552 9,048,419.6 4,191,590.6
session logical reads 3,384,638 2,376.9 1,101.1
session pga memory max 6,168,536 4,331.8 2,006.7
session uga memory 599,984 421.3 195.2
session uga memory max 9,592,864 6,736.6 3,120.7
shared hash latch upgrades - no w 27,737 19.5 9.0
shared hash latch upgrades - wait 84 0.1 0.0
sorts (disk) 0 0.0 0.0
sorts (memory) 6,834 4.8 2.2
sorts (rows) 3,229,994 2,268.3 1,050.8
summed dirty queue length 0 0.0 0.0
switch current to new buffer 990 0.7 0.3
table fetch by rowid 474,673 333.3 154.4
table fetch continued row 8 0.0 0.0
table scan blocks gotten 2,751,375 1,932.2 895.1
Instance Activity Stats for DB: AHD Instance: ahd Snaps: 20 -21
Statistic Total per Second per Trans
table scan rows gotten 55,928,200 39,275.4 18,194.0
table scans (long tables) 245 0.2 0.1
table scans (short tables) 3,383 2.4 1.1
transaction rollbacks 3 0.0 0.0
transaction tables consistent rea 0 0.0 0.0
transaction tables consistent rea 0 0.0 0.0
user calls 131,904 92.6 42.9
user commits 3,074 2.2 1.0
user rollbacks 0 0.0 0.0
workarea executions - onepass 0 0.0 0.0
workarea executions - optimal 8,438 5.9 2.7
write clones created in backgroun 0 0.0 0.0
write clones created in foregroun 0 0.0 0.0
Tablespace IO Stats for DB: AHD Instance: ahd Snaps: 20 -21
->ordered by IOs (Reads + Writes) desc
Tablespace
Av Av Av Av Buffer Av Buf
Reads Reads/s Rd(ms) Blks/Rd Writes Writes/s Waits Wt(ms)
AHD1_DATA
105,869 74 0.9 1.3 828 1 11,740 0.5
AHD1_IDX
38 0 7.4 1.0 563 0 0 0.0
PERFSTAT
372 0 3.6 1.0 0 0 0 0.0
UNDOTBS1
0 0 0.0 248 0 0 0.0
SYSTEM
6 0 6.7 1.0 5 0 0 0.0
File IO Stats for DB: AHD Instance: ahd Snaps: 20 -21
->ordered by Tablespace, File
Tablespace Filename
Av Av Av Av Buffer Av Buf
Reads Reads/s Rd(ms) Blks/Rd Writes Writes/s Waits Wt(ms)
AHD1_DATA E:\ORACLE\ORADATA\AHD\AHD1_DATA.ORA
53,454 38 0.9 1.3 432 0 5,949 0.5
E:\ORACLE\ORADATA\AHD\AHD2_DATA.ORA
52,415 37 0.9 1.3 396 0 5,791 0.5
AHD1_IDX E:\ORACLE\ORADATA\AHD\AHD1_IDX.ORA
38 0 7.4 1.0 563 0 0
PERFSTAT E:\ORACLE\ORADATA\AHD\PERFSTAT.ORA
372 0 3.6 1.0 0 0 0
SYSTEM E:\ORACLE\ORADATA\AHD\SYSTEM01.DBF
6 0 6.7 1.0 5 0 0
UNDOTBS1 E:\ORACLE\ORADATA\AHD\UNDOTBS01.DBF
0 0 248 0 0
Buffer Pool Statistics for DB: AHD Instance: ahd Snaps: 20 -21
-> Standard block size Pools D: default, K: keep, R: recycle
-> Default Pools for other block sizes: 2k, 4k, 8k, 16k, 32k
Free Write Buffer
Number of Cache Buffer Physical Physical Buffer Complete Busy
P Buffers Hit % Gets Reads Writes Waits Waits Waits
D 82,082 97.8 6,327,007 138,971 1,644 0 0 11,760
Instance Recovery Stats for DB: AHD Instance: ahd Snaps: 20 -21
-> B: Begin snapshot, E: End snapshot
Targt Estd Log File Log Ckpt Log Ckpt
MTTR MTTR Recovery Actual Target Size Timeout Interval
(s) (s) Estd IOs Redo Blks Redo Blks Redo Blks Redo Blks Redo Blks
B 75 26 2354 18057 17632 184320 17632
E 75 27 2967 23569 22952 184320 22952
Buffer Pool Advisory for DB: AHD Instance: ahd End Snap: 21
-> Only rows with estimated physical reads >0 are displayed
-> ordered by Block Size, Buffers For Estimate
Size for Size Buffers for Est Physical Estimated
P Estimate (M) Factr Estimate Read Factor Physical Reads
D 64 .1 8,008 261.38 4,357,231,706
D 128 .2 16,016 207.44 3,458,029,385
D 192 .3 24,024 143.22 2,387,570,894
D 256 .4 32,032 2.29 38,243,018
D 320 .5 40,040 1.89 31,541,321
D 384 .6 48,048 1.74 29,023,767
D 448 .7 56,056 1.69 28,232,064
D 512 .8 64,064 1.20 19,951,481
D 576 .9 72,072 1.11 18,529,925
D 640 1.0 80,080 1.04 17,367,752
D 656 1.0 82,082 1.00 16,670,129
D 704 1.1 88,088 0.97 16,124,256
D 768 1.2 96,096 0.91 15,155,822
D 832 1.3 104,104 0.90 15,055,099
D 896 1.4 112,112 0.89 14,839,567
D 960 1.5 120,120 0.88 14,668,682
D 1,024 1.6 128,128 0.87 14,479,726
D 1,088 1.7 136,136 0.84 13,988,866
D 1,152 1.8 144,144 0.70 11,723,518
D 1,216 1.9 152,152 0.61 10,156,857
D 1,280 2.0 160,160 0.20 3,281,883
Buffer wait Statistics for DB: AHD Instance: ahd Snaps: 20 -21
-> ordered by wait time desc, waits desc
Tot Wait Avg
Class Waits Time (s) Time (ms)
data block 11,754 6 0
PGA Aggr Target Stats for DB: AHD Instance: ahd Snaps: 20 -21
-> B: Begin snap E: End snap (rows dentified with B or E contain data
which is absolute i.e. not diffed over the interval)
-> PGA cache hit % - percentage of W/A (WorkArea) data processed only in-memory
-> Auto PGA Target - actual workarea memory target
-> W/A PGA Used - amount of memory used for all Workareas (manual + auto)
-> %PGA W/A Mem - percentage of PGA memory allocated to workareas
-> %Auto W/A Mem - percentage of workarea memory controlled by Auto Mem Mgmt
-> %Man W/A Mem - percentage of workarea memory under manual control
PGA Cache Hit % W/A MB Processed Extra W/A MB Read/Written
100.0 1,169 0
%PGA %Auto %Man
PGA Aggr Auto PGA PGA Mem W/A PGA W/A W/A W/A Global Mem
Target(M) Target(M) Alloc(M) Used(M) Mem Mem Mem Bound(K)
B 350 293 37.6 0.0 .0 .0 .0 17,920
E 350 293 37.5 0.2 .6 100.0 .0 17,920
PGA Aggr Target Histogram for DB: AHD Instance: ahd Snaps: 20 -21
-> Optimal Executions are purely in-memory operations
Low High
Optimal Optimal Total Execs Optimal Execs 1-Pass Execs M-Pass Execs
8K 16K 6,809 6,809 0 0
16K 32K 148 148 0 0
32K 64K 90 90 0 0
64K 128K 154 154 0 0
128K 256K 73 73 0 0
256K 512K 308 308 0 0
512K 1024K 374 374 0 0
1M 2M 171 171 0 0
2M 4M 217 217 0 0
4M 8M 10 10 0 0
PGA Memory Advisory for DB: AHD Instance: ahd End Snap: 21
-> When using Auto Memory Mgmt, minimally choose a pga_aggregate_target value
where Estd PGA Overalloc Count is 0
Estd Extra Estd PGA Estd PGA
PGA Target Size W/A MB W/A MB Read/ Cache Overalloc
Est (MB) Factr Processed Written to Disk Hit % Count
44 0.1 180,060.5 42,218.7 81.0 4
88 0.3 180,060.5 23,194.7 89.0 0
175 0.5 180,060.5 9,436.8 95.0 0
263 0.8 180,060.5 9,356.7 95.0 0
350 1.0 180,060.5 9,274.8 95.0 0
420 1.2 180,060.5 9,169.9 95.0 0
490 1.4 180,060.5 9,148.0 95.0 0
560 1.6 180,060.5 9,148.0 95.0 0
630 1.8 180,060.5 9,148.0 95.0 0
700 2.0 180,060.5 9,148.0 95.0 0
1,050 3.0 180,060.5 9,148.0 95.0 0
1,400 4.0 180,060.5 9,148.0 95.0 0
2,100 6.0 180,060.5 3,983.3 98.0 0
2,800 8.0 180,060.5 3,983.3 98.0 0
Rollback Segment Stats for DB: AHD Instance: ahd Snaps: 20 -21
->A high value for "Pct Waits" suggests more rollback segments may be required
->RBS stats may not be accurate between begin and end snaps when using Auto Undo
managment, as RBS may be dynamically created and dropped as needed
Trans Table Pct Undo Bytes
RBS No Gets Waits Written Wraps Shrinks Extends
0 29.0 0.00 0 0 0 0
1 975.0 0.00 122,796 0 0 0
2 1,244.0 0.00 1,094,706 10 0 5
3 816.0 0.00 118,596 0 0 0
4 1,430.0 0.00 212,754 2 0 0
5 1,716.0 0.00 291,940 2 0 0
6 1,287.0 0.00 197,900 0 0 0
7 1,674.0 0.00 279,160 0 0 0
8 1,031.0 0.00 148,216 0 0 0
9 947.0 0.00 141,870 0 0 0
10 834.0 0.00 117,422 0 0 0
Rollback Segment Storage for DB: AHD Instance: ahd Snaps: 20 -21
->Optimal Size should be larger than Avg Active
RBS No Segment Size Avg Active Optimal Size Maximum Size
0 385,024 0 385,024
1 2,220,032 455,412 2,220,032
2 2,088,960 333,026 2,220,032
3 2,220,032 456,101 2,220,032
4 2,220,032 474,584 3,268,608
5 2,220,032 480,865 3,268,608
6 2,220,032 513,967 3,268,608
7 2,220,032 480,785 2,220,032
8 2,220,032 496,182 2,220,032
9 2,220,032 486,763 2,220,032
10 2,220,032 430,016 6,414,336
Undo Segment Summary for DB: AHD Instance: ahd Snaps: 20 -21
-> Undo segment block stats:
-> uS - unexpired Stolen, uR - unexpired Released, uU - unexpired reUsed
-> eS - expired Stolen, eR - expired Released, eU - expired reUsed
Undo Undo Num Max Qry Max Tx Snapshot Out of uS/uR/uU/
TS# Blocks Trans Len (s) Concurcy Too Old Space eS/eR/eU
1 395 2,900,725 5 1 0 0 0/0/0/0/0/0
Undo Segment Stats for DB: AHD Instance: ahd Snaps: 20 -21
-> ordered by Time desc
Undo Num Max Qry Max Tx Snap Out of uS/uR/uU/
End Time Blocks Trans Len (s) Concy Too Old Space eS/eR/eU
13-Feb 15:04 96 ######## 4 1 0 0 0/0/0/0/0/0
13-Feb 14:54 299 ######## 5 1 0 0 0/0/0/0/0/0
Latch Activity for DB: AHD Instance: ahd Snaps: 20 -21
->"Get Requests", "Pct Get Miss" and "Avg Slps/Miss" are statistics for
willing-to-wait latch get requests
->"NoWait Requests", "Pct NoWait Miss" are for no-wait latch get requests
->"Pct Misses" for both should be very close to 0.0
Pct Avg Wait Pct
Get Get Slps Time NoWait NoWait
Latch Requests Miss /Miss (s) Requests Miss
Consistent RBA 5,216 0.0 0 0
FOB s.o list latch 34 0.0 0 0
SQL memory manager latch 1 0.0 0 462 0.0
SQL memory manager worka 40,347 0.0 0 0
active checkpoint queue 1,261 0.0 0 0
archive control 163 0.0 0 0
archive process latch 29 0.0 0 0
cache buffer handles 378 0.0 0 0
cache buffers chains 6,836,244 0.4 0.0 0 266,617 0.0
cache buffers lru chain 244,157 0.0 0.0 0 140,432 0.0
channel handle pool latc 21 0.0 0 0
channel operations paren 960 0.0 0 0
checkpoint queue latch 86,982 0.0 0 2,337 0.0
child cursor hash table 6,464 0.0 0.0 0 0
dml lock allocation 15,005 0.0 0 0
dummy allocation 21 0.0 0 0
enqueue hash chains 28,447 0.0 0 0
enqueues 8,689 0.0 0 0
event group latch 11 0.0 0 0
file number translation 4,079 0.0 0 0
hash table column usage 38 0.0 0 187,596 0.0
hash table modification 1 0.0 0 0
job_queue_processes para 23 0.0 0 0
ktm global data 4 0.0 0 0
kwqit: protect wakeup ti 45 0.0 0 0
lgwr LWN SCN 5,328 0.4 0.0 0 0
library cache 342,865 0.2 0.0 0 342 0.6
library cache load lock 452 0.0 0 0
library cache pin 197,662 0.0 0.0 0 0
library cache pin alloca 124,035 0.0 0.0 0 0
list of block allocation 55 0.0 0 0
messages 30,779 0.0 0.0 0 0
mostly latch-free SCN 5,459 1.8 0.0 0 0
multiblock read objects 194,822 0.0 0.0 0 0
ncodef allocation latch 23 0.0 0 0
object stats modificatio 618 0.0 0 0
post/wait queue 10,441 0.0 0 3,078 0.0
process allocation 11 0.0 0 11 0.0
process group creation 21 0.0 0 0
redo allocation 37,773 0.0 0.0 0 0
redo copy 0 0 27,274 0.0
redo writing 17,880 0.0 0 0
row cache enqueue latch 169,423 0.0 0.0 0 0
row cache objects 169,795 0.0 0 3 0.0
sequence cache 38 0.0 0 0
session allocation 15,580 0.0 0 0
session idle bit 269,419 0.0 0.0 0 0
session switching 23 0.0 0 0
session timer 478 0.0 0 0
shared pool 104,427 0.1 0.0 0 0
Latch Activity for DB: AHD Instance: ahd Snaps: 20 -21
->"Get Requests", "Pct Get Miss" and "Avg Slps/Miss" are statistics for
willing-to-wait latch get requests
->"NoWait Requests", "Pct NoWait Miss" are for no-wait latch get requests
->"Pct Misses" for both should be very close to 0.0
Pct Avg Wait Pct
Get Get Slps Time NoWait NoWait
Latch Requests Miss /Miss (s) Requests Miss
sim partition latch 0 0 32 0.0
simulator hash latch 217,119 0.0 0.0 0 0
simulator lru latch 16,247 0.0 0 902 0.4
sort extent pool 29 0.0 0 0
transaction allocation 36 0.0 0 0
transaction branch alloc 23 0.0 0 0
undo global data 19,973 0.0 0 0
user lock 42 0.0 0 0
Latch Sleep breakdown for DB: AHD Instance: ahd Snaps: 20 -21
-> ordered by misses desc
Get Spin &
Latch Name Requests Misses Sleeps Sleeps 1->4
cache buffers chains 6,836,244 26,201 46 0/0/0/0/0
library cache 342,865 778 5 773/5/0/0/0
shared pool 104,427 125 3 122/3/0/0/0
Latch Miss Sources for DB: AHD Instance: ahd Snaps: 20 -21
-> only latches with sleeps are shown
-> ordered by name, sleeps desc
NoWait Waiter
Latch Name Where Misses Sleeps Sleeps
cache buffers chains kcbgtcr: kslbegin excl 0 32 30
cache buffers chains kcbrls: kslbegin 0 7 13
cache buffers chains kcbzwb 0 4 3
cache buffers chains kcbgtcr: fast path 0 3 0
library cache kglic 0 2 0
library cache kglobpn: child: 0 2 0
library cache kgllkdl: child: cleanup 0 1 0
shared pool kghalo 0 2 0
shared pool kghalp 0 1 0
Child Latch Statistics DB: AHD Instance: ahd Snaps: 20 -21
-> only latches with sleeps/gets > 1/100000 are shown
-> ordered by name, gets desc
Child Get Spin &
Latch Name Num Requests Misses Sleeps Sleeps 1->4
cache buffers chains 439 28,269 1,276 1 0/0/0/0/0
cache buffers chains 269 26,297 842 1 0/0/0/0/0
cache buffers chains 1010 17,482 49 2 0/0/0/0/0
cache buffers chains 260 11,141 20 1 0/0/0/0/0
cache buffers chains 324 9,454 29 1 0/0/0/0/0
cache buffers chains 840 7,235 20 1 0/0/0/0/0
cache buffers chains 46 6,868 25 1 0/0/0/0/0
cache buffers chains 835 6,799 26 2 0/0/0/0/0
cache buffers chains 202 6,768 17 1 0/0/0/0/0
cache buffers chains 740 6,573 38 2 0/0/0/0/0
cache buffers chains 592 6,508 30 1 0/0/0/0/0
cache buffers chains 436 6,485 25 2 0/0/0/0/0
cache buffers chains 513 6,443 16 1 0/0/0/0/0
cache buffers chains 844 6,436 28 1 0/0/0/0/0
cache buffers chains 117 6,423 25 1 0/0/0/0/0
cache buffers chains 389 6,381 25 1 0/0/0/0/0
cache buffers chains 116 6,349 29 1 0/0/0/0/0
cache buffers chains 51 6,340 34 1 0/0/0/0/0
cache buffers chains 914 6,259 31 1 0/0/0/0/0
cache buffers chains 713 6,249 24 1 0/0/0/0/0
cache buffers chains 465 6,198 27 2 0/0/0/0/0
cache buffers chains 416 6,193 27 1 0/0/0/0/0
cache buffers chains 432 6,155 34 1 0/0/0/0/0
cache buffers chains 583 6,152 23 2 0/0/0/0/0
cache buffers chains 126 6,147 35 1 0/0/0/0/0
cache buffers chains 879 6,043 21 1 0/0/0/0/0
cache buffers chains 110 6,010 25 1 0/0/0/0/0
cache buffers chains 138 6,010 25 1 0/0/0/0/0
cache buffers chains 472 6,002 31 1 0/0/0/0/0
cache buffers chains 908 5,964 20 1 0/0/0/0/0
cache buffers chains 860 5,950 23 1 0/0/0/0/0
cache buffers chains 71 5,945 29 3 0/0/0/0/0
cache buffers chains 20 5,780 28 1 0/0/0/0/0
cache buffers chains 932 5,759 25 1 0/0/0/0/0
cache buffers chains 866 5,610 22 1 0/0/0/0/0
cache buffers chains 989 5,454 34 2 0/0/0/0/0
cache buffers chains 1005 5,434 40 1 0/0/0/0/0
library cache 6 47,067 52 3 49/3/0/0/0
shared pool 1 99,771 124 3 121/3/0/0/0
Top 5 Logical Reads per Segment for DB: AHD Instance: ahd Snaps: 20 -21
-> End Segment Logical Reads Threshold: 10000
Subobject Obj. Logical
Owner Tablespace Object Name Name Type Reads %Total
AHD AHD1_DATA CALL_REQ TABLE 1,714,928 51.19
AHD AHD1_DATA CTCT TABLE 1,169,360 34.90
AHD AHD1_IDX SYS_C003707 INDEX 89,152 2.66
AHD AHD1_DATA CNOTE TABLE 66,272 1.98
AHD AHD1_IDX CALL_REQ_X5 INDEX 61,360 1.83
Top 5 Physical Reads per Segment for DB: AHD Instance: ahd Snaps: 20 -21
-> End Segment Physical Reads Threshold: 1000
Subobject Obj. Physical
Owner Tablespace Object Name Name Type Reads %Total
AHD AHD1_DATA CALL_REQ TABLE 132,989 95.95
AHD AHD1_DATA CTCT TABLE 5,325 3.84
AHD AHD1_DATA CI_AUDIT_TRAILS_GU_I INDEX 43 .03
AHD AHD1_DATA ACT_LOG TABLE 38 .03
AHD AHD1_DATA CI_EXT_CALLS_GUID INDEX 36 .03
Top 5 Buf. Busy Waits per Segment for DB: AHD Instance: ahd Snaps: 20 -21
-> End Segment Buffer Busy Waits Threshold: 100
Buffer
Subobject Obj. Busy
Owner Tablespace Object Name Name Type Waits %Total
AHD AHD1_DATA CALL_REQ TABLE 11,751 99.95
AHD AHD1_DATA CTCT TABLE 6 .05
Dictionary Cache Stats for DB: AHD Instance: ahd Snaps: 20 -21
->"Pct Misses" should be very low (< 2% in most cases)
->"Cache Usage" is the number of cache entries being used
->"Pct SGA" is the ratio of usage to allocated size for that cache
Get Pct Scan Pct Mod Final
Cache Requests Miss Reqs Miss Reqs Usage
dc_files 30 0.0 0 0 15
dc_histogram_defs 3,022 3.9 0 0 1,919
dc_object_ids 22,961 0.1 0 0 1,181
dc_objects 1,092 9.2 0 0 1,026
dc_profiles 11 0.0 0 0 1
dc_rollback_segments 168 0.0 0 0 22
dc_segments 5,519 0.1 0 0 1,334
dc_sequences 1 0.0 0 1 2
dc_tablespace_quotas 3 0.0 0 3 2
dc_tablespaces 25,902 0.0 0 0 16
dc_user_grants 127 0.0 0 0 22
dc_usernames 110 0.0 0 0 18
dc_users 26,077 0.0 0 0 30
Library Cache Activity for DB: AHD Instance: ahd Snaps: 20 -21
->"Pct Misses" should be very low
Get Pct Pin Pct Invali-
Namespace Requests Miss Requests Miss Reloads dations
CLUSTER 19 0.0 16 0.0 0 0
INDEX 315 0.0 315 0.0 0 0
SQL AREA 27,908 0.0 94,300 0.5 38 0
TABLE/PROCEDURE 3,793 2.6 6,017 6.5 55 0
TRIGGER 20 0.0 20 0.0 0 0
Shared Pool Advisory for DB: AHD Instance: ahd End Snap: 21
-> Note there is often a 1:Many correlation between a single logical object
in the Library Cache, and the physical number of memory objects associated
with it. Therefore comparing the number of Lib Cache objects (e.g. in
v$librarycache), with the number of Lib Cache Memory Objects is invalid
Estd
Shared Pool SP Estd Estd Estd Lib LC Time
Size for Size Lib Cache Lib Cache Cache Time Saved Estd Lib Cache
Estim (M) Factr Size (M) Mem Obj Saved (s) Factr Mem Obj Hits
88 .6 81 11,169 59,229 1.0 6,202,663
104 .7 96 13,308 59,237 1.0 6,207,373
120 .8 112 15,603 59,277 1.0 6,228,405
136 .9 127 18,086 59,348 1.0 6,265,370
152 1.0 142 19,501 59,379 1.0 6,295,279
168 1.1 157 21,035 59,426 1.0 6,314,861
184 1.2 172 22,038 59,455 1.0 6,325,903
200 1.3 187 23,807 59,459 1.0 6,328,446
216 1.4 202 25,911 59,460 1.0 6,329,386
232 1.5 217 28,194 59,461 1.0 6,330,245
248 1.6 232 29,884 59,462 1.0 6,330,914
264 1.7 248 31,127 59,462 1.0 6,331,222
280 1.8 263 32,878 59,463 1.0 6,331,563
296 1.9 278 34,121 59,463 1.0 6,331,898
312 2.1 295 36,139 59,463 1.0 6,332,102
SGA Memory Summary for DB: AHD Instance: ahd Snaps: 20 -21
SGA regions Size in Bytes
Database Buffers 687,865,856
Fixed Size 455,196
Redo Buffers 929,792
Variable Size 293,601,280
sum 982,852,124
SGA breakdown difference for DB: AHD Instance: ahd Snaps: 20 -21
Pool Name Begin value End value % Diff
java free memory 75,497,472 75,497,472 0.00
large free memory 41,943,040 41,943,040 0.00
shared 1M buffer 2,098,176 2,098,176 0.00
shared Checkpoint queue 846,912 846,912 0.00
shared FileOpenBlock 695,504 695,504 0.00
shared KGK heap 3,756 3,756 0.00
shared KGLS heap 1,230,944 1,438,740 16.88
shared KQR L PO 2,064 2,064 0.00
shared KQR M PO 2,480,924 2,514,220 1.34
shared KQR S PO 383,036 383,036 0.00
shared KQR S SO 5,636 5,636 0.00
shared KSXR pending messages que 841,036 841,036 0.00
shared KSXR receive buffers 1,033,000 1,033,000 0.00
shared MTTR advisory 97,412 97,412 0.00
shared PL/SQL DIANA 624,112 624,112 0.00
shared PL/SQL MPCODE 422,640 422,640 0.00
shared PLS non-lib hp 2,068 2,068 0.00
shared character set object 323,724 323,724 0.00
shared dictionary cache 1,610,880 1,610,880 0.00
shared errors 35,964 35,964 0.00
shared event statistics per sess 1,718,360 1,718,360 0.00
shared fixed allocation callback 300 300 0.00
shared free memory 26,982,004 26,841,956 -0.52
shared joxs heap init 4,220 4,220 0.00
shared kgl simulator 3,980,240 3,996,976 0.42
shared library cache 54,425,164 53,999,624 -0.78
shared message pool freequeue 834,752 834,752 0.00
shared miscellaneous 8,126,704 8,177,516 0.63
shared parameters 1,632 1,632 0.00
shared sessions 410,720 410,720 0.00
shared sim memory hea 377,656 377,656 0.00
shared sql area 66,513,080 66,768,476 0.38
shared subheap 45,216 45,216 0.00
shared table definiti 1,200 2,752 129.33
shared trigger defini 340 340 0.00
shared trigger inform 1,292 1,292 0.00
shared trigger source 100 100 0.00
buffer_cache 687,865,856 687,865,856 0.00
fixed_sga 455,196 455,196 0.00
log_buffer 918,528 918,528 0.00
init.ora Parameters for DB: AHD Instance: ahd Snaps: 20 -21
End value
Parameter Name Begin value (if different)
aq_tm_processes 1
background_dump_dest E:\oracle\admin\ahd\bdump
compatible 9.2.0.0.0
control_files E:\oracle\oradata\ahd\CONTROL01.C
core_dump_dest E:\oracle\admin\ahd\cdump
cursor_sharing SIMILAR
db_block_size 8192
db_cache_size 687865856
db_domain
db_file_multiblock_read_count 8
db_name ahd
db_writer_processes 2
dispatchers (PROTOCOL=TCP) (SERVICE=ahdXDB)
fast_start_mttr_target 300
hash_join_enabled TRUE
instance_name ahd
java_pool_size 75497472
job_queue_processes 10
large_pool_size 41943040
log_archive_dest_1 location=c:\archive
log_archive_format arc%d_%t_%s.arc
log_archive_start TRUE
open_cursors 300
pga_aggregate_target 367001600
processes 150
query_rewrite_enabled FALSE
remote_login_passwordfile EXCLUSIVE
shared_pool_size 159383552
sort_area_size 10485760
star_transformation_enabled FALSE
timed_statistics TRUE
undo_management AUTO
undo_retention 3600
undo_tablespace UNDOTBS1
user_dump_dest E:\oracle\admin\ahd\udump
End of Report
I am getting buffer busy waits on some tables.
Users are not experiencing any problem.Looks like you got bit by the CTD troll while sleeping.
Note also that (if I'm reading the report alright) out of 23 mins you have 6 seconds accounted to buffer busy waits.
Read the sample chapter here.
Similar Messages
-
Buffer busy wait, 1st level bmp
Hi All !
OS: Linux redhat 5
DB: 11gr2
Block size: 8K
In an application we use I can see high buffer busy waits over a various periods.
I collect some info during this event.
SQL_HASH_VALUE FILE# BLOCK# REASON
769132182 6 17512 8
3983195767 6 17512 8
769132182 6 17512 8
3240261994 6 17512 8
3240261994 6 17512 8
3240261994 6 17512 8
769132182 6 17512 8
... I have total 35 sessions
File6 / block 17512 =
TABLESPACE_NAME SEGMENT_TYPE OWNER SEGMENT_NAME
GBSLOB LOBSEGMENT GBSASP SYS_LOB0000017961C00006$$
The sql are both inserts and updates to the same large table, blobs are involved (insert/update)
blobs using securefile
AWR reports this for a short period
Buffer busy waits is the top wait event
Buffer Wait Statistics DB/Inst: GGBISP01/ggbisp01 Snaps: 20925-20926
-> ordered by wait time desc, waits desc
Class Waits Total Wait Time (s) Avg Time (ms)
1st level bmb 574,636 17,118 30
free list 20,538 70 3
undo header 41,150 7 0
data block 263 1 3
undo block 18 0 0
I'm trying to find more details about this wait event, I believe it is related to usage of ASSM.
Can anyone explain more when 1st level bmp is seen ?
Thank you !
Best regards
Magnus JohanssonMaJo wrote:
SQL_HASH_VALUE FILE# BLOCK# REASON
769132182 6 17512 8
3983195767 6 17512 8
769132182 6 17512 8
3240261994 6 17512 8
3240261994 6 17512 8
3240261994 6 17512 8
769132182 6 17512 8
... I have total 35 sessions
File6 / block 17512 =
TABLESPACE_NAME SEGMENT_TYPE OWNER SEGMENT_NAME
GBSLOB LOBSEGMENT GBSASP SYS_LOB0000017961C00006$$The sql are both inserts and updates to the same large table, blobs are involved (insert/update)
blobs using securefile
AWR reports this for a short period
Buffer busy waits is the top wait event
Buffer Wait Statistics DB/Inst: GGBISP01/ggbisp01 Snaps: 20925-20926
-> ordered by wait time desc, waits desc
Class Waits Total Wait Time (s) Avg Time (ms)
1st level bmb 574,636 17,118 30
free list 20,538 70 3
undo header 41,150 7 0
data block 263 1 3
undo block 18 0 0
-------------------------------------------------------------I'm trying to find more details about this wait event, I believe it is related to usage of ASSM.
Can anyone explain more when 1st level bmp is seen ?
Your AWR shows an interesting mix of ASSM and freelist group blocks - are you running ASSM ?
1st level bitmap blocks (bmb) are the blocks in a segment (usually the first one or two of each extent) that show the availability of free space in the other data blocks. Each bitmap block can identify up to 256 other blocks (the last time I checked), although you have to have a fairly large data segment before you reach this level of mapping.
If you have a high rate of concurrent inserts and updates on a LOB column then you may be running into code that frequently updates bitmap blocks to show that data blocks have changed from empty to full. It's also possible that you've run into one of the many bugs that appeared when you mixed ASSM with LOB segments - you haven't given the exact version of 11.2, but you might want to check the latest versions and any bug reports for patches to your version.
Regards
Jonathan Lewis -
HI,
I am facing a problem of gc buffer busy waits and log file switch completion on my live rac database of two nodes.
Thank you for your cooperation.
Regards,
Adnan Hamdus SalamAman.... wrote:
I am sorry sir. I gave that link for the gc buffer busy wait only and overlooked the log file switch part.
No need to apologise, or call me sir (the English and American use of the words have very different connotations). I was just adding an extra detail to go with a useful reference.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
A general reminder about "Forum Etiquette / Reward Points": http://forums.oracle.com/forums/ann.jspa?annID=718
If you never mark your questions as answered people will eventually decide that it's not worth trying to answer you because they will never know whether or not their answer has been of any use, or whether you even bothered to read it.
It is also important to mark answers that you thought helpful - again it lets other people know that you appreciate their help, but it also acts as a pointer for other people when they are researching the same question, moreover it means that when you mark a bad or wrong answer as helpful someone may be prompted to tell you (and the rest of the forum) what's so bad or wrong about the answer you found helpful. -
High waits on scatter read and buffer busy wait ..
one of my system is undergoing some serious problem ~
i checked when some sql querying few large tables ( 30 millions rows ,partioned )
system waits became significant .. the ones stand out are scatter read and buffer busy wait ...
on the longop , you can see those sessions waitting to scan the large table ..
buffer get ratio dropped from 90% to like 30% ,average buffer hit ratio is like 55%
mu questions are
1.what's your view of throwing the problem away ?
add physical memory, then increase data buffer ?
it's getting scanned very often , but it's too large to pin it in the keep pool .
2. why buffer busy wait ?
i don't fully understand why this happened ?
becase what they are doing are just querying ,nobody is modifing any data ?
will increase freelist help this ??
thanks your talneted ideas
br/rickyHave these SQL statements been added recently, or have they been around for a long time. If the latter, then it seems likely that they've changed their execution plan to start doing tablescans (hence db file scattered read waits) or index fast full scans.
One of the causes of buffer busy waits is concurrent tablescans/index fast full scans - in 10g this particular cause has been split and reported as "read by other session".
Your first action should be to see if there is a more efficient execution plan for these queries. If the problem is due to a change in execution plan, common causes are: changes in statistics on the objects, failure to change statistics on the objects, changes in input value on the queries, changes in optimizer parameters, unlucky changes in data volumes.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk -
What is the difference between buffer busy waits and free buffer waits
what is the difference between buffer busy waits events and free buffer waits in Oracle database?
select *
from
v$system_event
where
event like ‘%wait%’;
EVENT TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT
buffer busy waits 636528 1557 549700 .863591232
write complete waits 1193 0 14799 12.4048617
free buffer waits 1601 0 622 .388507183jetq wrote:
Buffer busy waits occur when an Oracle session needs to access a block in the buffer cache, but cannot because the buffer copy of the data block is locked. This buffer busy wait condition can happen for either of the following reasons:
* The block is being read into the buffer by another session, so the waiting session must wait for the block read to complete. If the OP is running 10g, that would be recorded as "read by other session" not "buffer busy waits" - and unfortunately he didn't tell us the version.
* Another session has the buffer block locked in a mode that is incompatible with the waiting session's request.
The Free Buffer Waits Oracle metric wait event indicates that a server process was unable to find a free buffer and has posted the database writer to make free buffers by writing out dirty buffers.
There is another possibility - if the OP is using a keep and recycle pool: see http://jonathanlewis.wordpress.com/2006/11/21/free-buffer-waits/
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"For every expert there is an equal and opposite expert"
Arthur C. Clarke -
Problem identifying db object for "buffer busy waits" event.
10.2.0.3
AIX 64
SELECT username, a.p1text, a.p1, a.p2text, a.p2, a.p3text, a.p3, event FROM v$session a WHERE
a.status='ACTIVE'
AND a.event = 'buffer busy waits'
Query reports about 40 active sessions with this information:
file# 3746
block# 2
class# 13
select
owner,
segment_name,
segment_type
from
dba_extents
where
file_id = 3746
and
2 between block_id and block_id + blocks -1;
no rows returned
SELECT MAX(a.file#) FROM sys.file$ a
3535
This was only a temporary situation when after couple of minutes(7) wait event "buffer busy waits" dissapeared completely.
Any ideas?
Thank you,
Daniel.http://perfvision.com/papers/06_buffer_cache.ppt
Slide 80-81 points at increasing the size of the initial and next extent for File Header Block buffer busy waits
Side 85 points at high extent allocation for File Header Block buffer busy waits
http://perfvision.com/ftp/hotsos/aas.ppt
Side 55 points at extent allocation too small/too many extents being allocated for File Header Block buffer busy waits
A couple hints from the documentation:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/instance_tune.htm
"To determine the possible causes [of buffer busy waits], first query V$SESSION to identify the value of ROW_WAIT_OBJ# when the session waits for buffer busy waits."
"To identify the object and object type contended for, query DBA_OBJECTS using the value for ROW_WAIT_OBJ# that is returned from V$SESSION."
"V$SEGMENT_STATISTICS - This is a user-friendly view of statistic values. In addition to all the columns of V$SEGSTAT, it has information about such things as the segment owner and table space name. It makes the statistics easy to understand, but it is more costly."
You may want to query DBA_TEMP_FILES for the specific FILE_ID identified by the V$SESSION. Taking a look at V$SEGMENT_STATISTICS might also be helpful.
Are you using dictionary managed tablespaces, locally managed tablespaces with manual extent size management, ASSM with manual extent size management, or ASSM with automatic extent size management?
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc. -
Difference between wait events 'buffer busy waits' & 'latch: CBC'
Hi ,
Can some one explain me the Difference Between 'Buffer Busy Waits' and 'Latch: Cache Buffers Chains"? What was explained in metalink note Doc ID: 833303.1
, is incomprehensible to me.
Looking for easy and better explanation.
Thanks
NaveenNaveen Sangam wrote:
Can some one explain me the Difference Between 'Buffer Busy Waits' and 'Latch: Cache Buffers Chains"? What was explained in metalink note Doc ID: 833303.1
, is incomprehensible to me.
That note is awful and should be witdrawn - amongst other things it makes it sound as if there is only one reason for buffer busy waits. There is an option to comment on such notes - I suggest you use it.
Going back a little further from Aman's description - and ignoring some of the internal details:
The buffer cache is split into a large number of small groups of buffered blocks; these groups are usually called "hash buckets" or "hash chains". If you need to find a block and it is buffered, Oracle can do some hashing arithmetic to work out which chain the block will be in.
The chains are protected by latches (typically a single latch protects 64 - 128 chains). You cannot examine a chain unless you are able to get the latch that protects it. So the commonest action you go through to view or modify a buffered block is:
<ul>
work out which chain
get the latch for the chain xxx
search along the chain to see if the block is in memory
attach a "pin" to the buffered block block if you find it (to make sure it can't be kicked out of memory)
release the latch
do what you want to do with the buffered block ***
get the latch for the chain xxx
remove the pin from the buffered block
release the latch
</ul>
The two points marked xxx are where you might end up sleeping in a wait for the "cache buffers chains latch". If too many people try to get the latch at the same time some of them will eventually fail and go to sleep for a short period.
The point marked *** is where you get the buffer busy wait. When you attach the pin to the buffered block it's possible that what you want to do to the bllock is incompatible with what other people are already doing - so you have to attach your pin to the "waiters" list (the people currently using the block will have their pins attached to the "users" list". Eventually your wait will time out, or the users will get out of the way and you can move your pin to the users list and do whatever it was you wanted to do.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan -
Id column in gc buffer busy waits
Hello,
What's the id column show for gc buffer busy or gc current request waits.. I could not find any description for "gc current request". However, Here is what I found in oracle doc .. It's not so clear..
Parameter Description
file# See "file#" on page C-3
block# See "block#" on page C-2
id The buffer busy wait event is called from different places in the sessionThanksAny one??
-
Statspack interpreting help - buffer busy waits
Hi,
I've got statspack report from 9.2.0.8 DB, cpu_count = 12 , there is 'buffer busy waits' in top 5 .
Is there a problem ?
DB Name DB Id Instance Inst Num Release Cluster Host
XXXX 138180125 XXXX 1 9.2.0.8.0 NO X1
Snap Id Snap Time Sessions Curs/Sess Comment
Begin Snap: 35980 14-Jul-10 01:00:02 17 8.8
End Snap: 35984 14-Jul-10 05:00:01 17 8.8
Elapsed: 239.98 (mins)
Cache Sizes (end)
~~~~~~~~~~~~~~~~~
Buffer Cache: 3,072M Std Block Size: 8K
Shared Pool Size: 512M Log Buffer: 4,096K
Load Profile
~~~~~~~~~~~~ Per Second Per Transaction
Redo size: 317,746.23 4,498.59
Logical reads: 11,150.77 157.87
Block changes: 2,134.89 30.23
Physical reads: 466.05 6.60
Physical writes: 133.62 1.89
User calls: 82.42 1.17
Parses: 67.92 0.96
Hard parses: 0.02 0.00
Sorts: 106.77 1.51
Logons: 0.03 0.00
Executes: 516.58 7.31
Transactions: 70.63
% Blocks changed per Read: 19.15 Recursive Call %: 95.00
Rollback per transaction %: 0.00 Rows per Sort: 4.34
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.03 Redo NoWait %: 100.00
Buffer Hit %: 95.91 In-memory Sort %: 100.00
Library Hit %: 100.00 Soft Parse %: 99.98
Execute to Parse %: 86.85 Latch Hit %: 99.65
Parse CPU to Parse Elapsd %: 7.82 % Non-Parse CPU: 99.91
Shared Pool Statistics Begin End
Memory Usage %: 43.53 43.92
% SQL with executions>1: 64.89 70.00
% Memory for SQL w/exec>1: 55.95 61.64
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
SQL*Net message from dblink 797,760 44,575 41.69
PL/SQL lock timer 1,207 34,992 32.73
db file sequential read 3,297,249 17,047 15.94
buffer busy waits 1,558,995 3,987 3.73
CPU time 3,204 3.00
Statistic Total per Second per Trans
enqueue timeouts 299 0.0 0.0
enqueue waits 425 0.0 0.0
exchange deadlocks 41 0.0 0.0
execute count 7,438,297 516.6 7.3
failed probes on index block recl 13 0.0 0.0
free buffer inspected 107,385 7.5 0.1
free buffer requested 7,344,870 510.1 7.2
hot buffers moved to head of LRU 2,332,802 162.0 2.3
immediate (CR) block cleanout app 356,492 24.8 0.4
immediate (CURRENT) block cleanou 1,751,731 121.7 1.7
index crx upgrade (found) 7 0.0 0.0
index crx upgrade (positioned) 25,604 1.8 0.0
index fast full scans (full) 888 0.1 0.0
index fetch by key 6,008,269 417.3 5.9
index scans kdiixs1 2,343,163 162.7 2.3
leaf node 90-10 splits 330 0.0 0.0
leaf node splits 13,681 1.0 0.0
logons cumulative 447 0.0 0.0
messages received 2,760,503 191.7 2.7
messages sent 2,760,503 191.7 2.7
no buffer to keep pinned count 0 0.0 0.0
no work - consistent read gets 89,143,249 6,190.9 87.7
opened cursors cumulative 978,462 68.0 1.0
parse count (failures) 0 0.0 0.0
parse count (hard) 243 0.0 0.0
parse count (total) 977,939 67.9 1.0
parse time cpu 276 0.0 0.0
parse time elapsed 3,531 0.3 0.0
physical reads 6,710,684 466.1 6.6
physical reads direct 140,520 9.8 0.1
physical writes 1,924,011 133.6 1.9
physical writes direct 149,434 10.4 0.2
physical writes non checkpoint 1,160,293 80.6 1.1
pinned buffers inspected 88,165 6.1 0.1
prefetched blocks 2,965,135 205.9 2.9
prefetched blocks aged out before 1,485 0.1 0.0
process last non-idle time 14,401 1.0 0.0
recovery blocks read 0 0.0 0.0
recursive calls 22,566,381 1,567.2 22.2
recursive cpu usage 314,662 21.9 0.3
redo blocks written 9,712,190 674.5 9.6
redo buffer allocation retries 483 0.0 0.0
redo entries 17,147,344 1,190.9 16.9
redo log space requests 760 0.1 0.0
redo log space wait time 1,255 0.1 0.0
redo ordering marks 21 0.0 0.0
redo size 4,575,228,028 317,746.2 4,498.6
redo synch time 73,190 5.1 0.1
redo synch writes 333,440 23.2 0.3
redo wastage 240,517,096 16,703.7 236.5
redo write time 136,628 9.5 0.1
redo writer latching time 56 0.0 0.0
redo writes 865,653 60.1 0.9
rollback changes - undo records a 60,510 4.2 0.1
rows fetched via callback 3,948,006 274.2 3.9
session connect time 0 0.0 0.0
Statistic Total per Second per Trans
session logical reads 160,559,938 11,150.8 157.9
session pga memory 223,020,424 15,488.6 219.3
session pga memory max 841,058,240 58,410.9 827.0
session uga memory 682,912,005,944 47,427,738.5 671,472.1
session uga memory max 505,627,192 35,115.4 497.2
shared hash latch upgrades - no w 1,661,152 115.4 1.6
shared hash latch upgrades - wait 101 0.0 0.0
sorts (disk) 2 0.0 0.0
sorts (memory) 1,537,403 106.8 1.5
sorts (rows) 6,669,072 463.2 6.6
summed dirty queue length 71,613 5.0 0.1
switch current to new buffer 80,971 5.6 0.1
table fetch by rowid 79,047,167 5,489.8 77.7
table fetch continued row 5,013,545 348.2 4.9
table scan blocks gotten 10,328,271 717.3 10.2
table scan rows gotten 381,848,913 26,519.1 375.5
table scans (long tables) 82 0.0 0.0
table scans (short tables) 1,117,114 77.6 1.1
transaction rollbacks 32,437 2.3 0.0
transaction tables consistent rea 39 0.0 0.0
transaction tables consistent rea 82,904 5.8 0.1
user calls 1,186,828 82.4 1.2
user commits 1,017,037 70.6 1.0
user rollbacks 0 0.0 0.0
workarea executions - onepass 7 0.0 0.0
workarea executions - optimal 2,291,005 159.1 2.3
write clones created in backgroun 3 0.0 0.0
write clones created in foregroun 711 0.1 0.0
Class Waits Time (s) Time (ms)
data block 1,549,301 4,015 3
segment header 253 1 2
undo block 2,574 0 0
undo header 2,209 0 0
extent map 2 0 5
Eq Requests Succ Gets Failed Gets Waits Time (ms) Time (s)
TX 1,749,961 1,749,961 0 202 6.47 1
HW 20,789 20,789 0 223 .40 0
Pct Avg Wait Pct
Get Get Slps Time NoWait NoWait
Latch Requests Miss /Miss (s) Requests Miss
Consistent RBA 866,126 0.0 0.0 0 0
FIB s.o chain latch 594 0.0 0 0
FOB s.o list latch 2,891 0.0 0.0 0 0
SQL memory manager latch 4 0.0 0 4,793 0.0
SQL memory manager worka 3,266,221 0.0 0.0 0 0
active checkpoint queue 1,905,423 0.5 0.0 0 0
archive control 28 0.0 0 0
cache buffer handles 12,070 0.0 0 0
cache buffers chains 387,508,854 0.6 0.0 134 11,212,815 0.1
cache buffers lru chain 1,946,036 0.0 0.0 0 14,681,284 0.2
channel handle pool latc 668 0.0 0 0
channel operations paren 12,460 0.0 0.0 0 0
checkpoint queue latch 209,244,852 0.0 0.0 0 1,775,314 0.0
child cursor hash table 3,240 0.7 0.0 0 0
commit callback allocati 16 0.0 0 0
dictionary lookup 13 0.0 0 0
dml lock allocation 5,900,238 0.3 0.0 0 0
dummy allocation 894 0.2 0.0 0 0
enqueue hash chains 19,444,854 0.1 0.0 0 0
enqueues 9,380,299 0.7 0.0 0 0
event group latch 288 0.0 0 0
event range base latch 3 0.0 0 0
global tx hash mapping 4,988,645 0.0 0.0 0 0
hash table column usage 82 0.0 0 1,783 0.0
job workq parent latch 1 100.0 0.0 0 242 15.3
job_queue_processes para 287 0.0 0 0
ktm global data 265 0.0 0 0
lgwr LWN SCN 868,053 0.1 0.0 0 0
library cache 29,540,874 0.1 0.0 0 37 0.0
library cache load lock 102 0.0 0 0
library cache pin 24,145,848 0.0 0.0 0 0
library cache pin alloca 3,988,997 0.0 0.0 0 0
list of block allocation 363,684 0.0 0.0 0 0
loader state object free 912 0.0 0 0
longop free list parent 479 0.0 0 60 1.7
message pool operations 100 1.0 0.0 0 0
messages 8,036,523 0.3 0.0 0 0
mostly latch-free SCN 878,016 1.0 0.0 0 0
multiblock read objects 922,048 0.1 0.0 0 0
ncodef allocation latch 230 0.0 0 0
object stats modificatio 2,100 0.0 0 0
post/wait queue 709,603 0.0 0.0 0 334,338 0.0
process allocation 576 0.0 0 288 0.0
process group creation 576 0.2 0.0 0 0
redo allocation 18,881,467 0.7 0.0 0 0
redo copy 0 0 17,155,579 0.1
redo writing 4,513,716 0.2 0.0 0 0
resumable state object 48 0.0 0 0
row cache enqueue latch 3,556,148 0.1 0.0 0 0
row cache objects 6,671,783 0.1 0.0 0 0
Pct Avg Wait Pct
Get Get Slps Time NoWait NoWait
Latch Requests Miss /Miss (s) Requests Miss
sequence cache 1,533,482 0.0 0.0 0 0
session allocation 15,194,281 0.1 0.0 0 0
session idle bit 3,005,477 0.0 0.0 0 0
session switching 230 0.0 0 0
session timer 4,825 0.0 0 0
shared pool 2,114,153 0.0 0.0 0 0
sim partition latch 0 0 10,243 0.6
simulator hash latch 8,460,492 0.0 0.0 0 0
simulator lru latch 223,868 0.0 0.3 0 470,589 0.1
sort extent pool 1,823 0.5 0.0 0 0
temporary table state ob 16 0.0 0 0
transaction allocation 533,964 0.0 0 0
transaction branch alloc 1,259,723 0.1 0.0 0 0
undo global data 17,460,173 0.0 0.0 0 14,976 0.0
user lock 906 0.1 0.0 0 0
Get Spin &
Latch Name Requests Misses Sleeps Sleeps 1->4
cache buffers chains 387,508,854 2,447,832 12,701 2435135/1269
3/4/0/0
redo allocation 18,881,467 131,460 343 131118/341/1
/0/0
enqueues 9,380,299 62,436 122 62314/122/0/
0/0
library cache 29,540,874 38,344 80 38264/80/0/0
/0
messages 8,036,523 25,266 28 25238/28/0/0
/0
dml lock allocation 5,900,238 19,220 25 19195/25/0/0
/0
enqueue hash chains 19,444,854 10,510 27 10483/27/0/0
/0
active checkpoint queue la 1,905,423 9,896 36 9860/36/0/0/
0
library cache pin 24,145,848 8,451 17 8434/17/0/0/
0
mostly latch-free SCN 878,016 8,423 17 8406/17/0/0/
0
session allocation 15,194,281 8,290 33 8257/33/0/0/
0
redo writing 4,513,716 7,235 13 7222/13/0/0/
0
undo global data 17,460,173 4,113 8 4105/8/0/0/0
row cache objects 6,671,783 3,680 4 3676/4/0/0/0
row cache enqueue latch 3,556,148 2,015 1 2014/1/0/0/0
checkpoint queue latch 209,244,852 1,756 6 1750/6/0/0/0
transaction branch allocat 1,259,723 1,236 7 1229/7/0/0/0
shared pool 2,114,153 808 2 806/2/0/0/0
library cache pin allocati 3,988,997 649 1 648/1/0/0/0
cache buffers lru chain 1,946,036 588 13 575/13/0/0/0
multiblock read objects 922,048 469 8 461/8/0/0/0
sequence cache 1,533,482 333 1 332/1/0/0/0
session idle bit 3,005,477 97 1 96/1/0/0/0
Consistent RBA 866,126 55 1 54/1/0/0/0
simulator lru latch 223,868 33 9 24/9/0/0/0
post/wait queue 709,603 27 1 26/1/0/0/0
NoWait Waiter
Latch Name Where Misses Sleeps Sleeps
active checkpoint queue kcbbacq: scan active check 0 36 36
cache buffers chains kcbgtcr: kslbegin excl 0 10,706 10,084
cache buffers chains kcbrls: kslbegin 0 937 1,577
cache buffers chains kcbzwb 0 371 388
cache buffers chains kcbgtcr: fast path 0 223 174
cache buffers chains kcbgcur: kslbegin 0 86 114
cache buffers chains kcbget: pin buffer 0 57 47
cache buffers chains kcbzib: finish free bufs 0 54 27
cache buffers chains kcbchg: kslbegin: bufs not 0 52 89
cache buffers chains kcbnlc 0 46 37
cache buffers chains kcbzgb: scan from tail. no 0 42 0
cache buffers chains kcbzib: multi-block read: 0 25 0
cache buffers chains kcbget: exchange rls 0 12 3
cache buffers chains kcbchg: kslbegin: call CR 0 12 80
cache buffers chains kcbget: exchange 0 10 8
cache buffers chains kcbnew 0 9 0
cache buffers chains kcbcge 0 1 0
cache buffers chains kcbgtcr 0 1 0
cache buffers chains kcbbxsv 0 1 16
cache buffers chains kcbkzs 0 1 3
cache buffers chains kcbbic2 0 1 2
cache buffers chains kcbbic1 0 1 5
cache buffers lru chain kcbzgb: multiple sets nowa 10,344 10 0
cache buffers lru chain kcbbiop: lru scan 112 3 0
checkpoint queue latch kcbklbc: Link buffer into 0 6 0
dml lock allocation ktaiam 0 15 16
dml lock allocation ktaidm 0 10 9
enqueue hash chains ksqgtl3 0 17 11
enqueue hash chains ksqrcl 0 9 15
enqueue hash chains ksqcnl 0 1 1
enqueues ksqdel 0 60 50
enqueues ksqgel: create enqueue 0 60 56
enqueues ksqies 0 2 16
lgwr LWN SCN kcs023 0 9 0
library cache kglpnc: child 0 29 29
library cache kglupc: child 0 25 22
library cache kgllkdl: child: cleanup 0 11 2
library cache kglpndl: child: before pro 0 5 4
library cache kglhdgn: child: 0 3 13
library cache kglhdgc: child: 0 2 1
library cache kglpndl: child: after proc 0 2 0
library cache kgldte: child 0 0 1 2
library cache kglpin: child: heap proces 0 1 0
library cache kglobpn: child: 0 1 5
library cache pin kglpndl 0 6 1
library cache pin kglpnc: child 0 6 8
library cache pin kglupc 0 5 4
library cache pin alloca kglpnal 0 1 1
messages ksarcv 0 12 5
messages ksarcv: after wait 0 8 19
messages ksaamb: after wakeup 0 8 4
mostly latch-free SCN kcslcu3 0 8 17
mostly latch-free SCN kcsnew_scn_rba 0 1 0
Latch Name Where Misses Sleeps Sleeps
multiblock read objects kcbzib: mbr get 0 4 4
multiblock read objects kcbzib: normal mbr free 0 4 4
post/wait queue ksliwat:add:nowait 0 1 0
redo allocation kcrfwr 0 322 248
redo allocation kcrfwi: more space 0 14 88
redo allocation kcrfwi: before write 0 7 7
redo writing kcrfwcr 0 9 12
redo writing kcrfwint: rba scn pair 0 2 0
redo writing kcrfwint: after write 0 2 6
row cache enqueue latch kqreqa 0 1 1
row cache objects kqrpre: find obj 0 3 1
row cache objects kqrpfl: not dirty 0 1 1
sequence cache kdnss 0 1 1
session allocation ksuprc 0 14 5
session allocation ksudlc 0 10 7
session allocation ksucri 0 6 14
session allocation ksuxds: not user session 0 3 7
session idle bit ksupuc: clear busy 0 1 0
shared pool kghalo 0 1 0
shared pool kghupr1 0 1 2
simulator lru latch kcbs_simulate: simulate se 0 8 9
simulator lru latch kcbs_lookup_setid 0 1 0
transaction branch alloc ktcbba 0 4 2
transaction branch alloc ktcbod 0 2 3
transaction branch alloc ksupuc 0 1 2
undo global data ktudba: KSLBEGIN 0 8 7
Top 5 Logical Reads per Segment for DB: XXXXX Instance: XXXXX Snaps: 35980
-> End Segment Logical Reads Threshold: 10000
Subobject Obj. Logical
Owner Tablespace Object Name Name Type Reads %Total
xxxxxxxx XXXXXDATA TAB1TABLE TABLE 39,838,592 37.65
Top 5 Physical Reads per Segment for DB: XXXXX Instance: XXXXX Snaps: 3598
-> End Segment Physical Reads Threshold: 1000
Subobject Obj. Physical
Owner Tablespace Object Name Name Type Reads %Total
xxxxxxxx XXXXXDATA TAB1TABLE TABLE 3,568,038 58.64
Top 5 Buf. Busy Waits per Segment for DB: XXXXX Instance: XXXXX Snaps: 359
-> End Segment Buffer Busy Waits Threshold: 100
Buffer
Subobject Obj. Busy
Owner Tablespace Object Name Name Type Waits %Total
xxxxxxxx XXXXXDATA TAB1TABLE 1,421,043 91.65
xxxxxxxx XXXXXDATA IDX_SOMEIDX INDEX 62,638 4.04
xxxxxxxx XXXXXTABLE TABLE 26,914 1.74
----------So, for me It looks like :
TAB1TABLE is buffer busy deliver but there are no inserts reported for that table,
I've checked that TAB1TABLE tablespace is NO ASSM and extent management is local with uniform size 1M .
So this is not obvious free list problem . Kind of strange for me .
Any ideas greatly appreciated :).
Regards.
Greguser10388717 wrote:
Hi,
I've got statspack report from 9.2.0.8 DB, cpu_count = 12 , there is 'buffer busy waits' in top 5 .
Is there a problem ?
DB Name DB Id Instance Inst Num Release Cluster Host
XXXX 138180125 XXXX 1 9.2.0.8.0 NO X1
Snap Id Snap Time Sessions Curs/Sess Comment
Begin Snap: 35980 14-Jul-10 01:00:02 17 8.8
End Snap: 35984 14-Jul-10 05:00:01 17 8.8
Elapsed: 239.98 (mins)
----------So, for me It looks like :
TAB1TABLE is buffer busy deliver but there are no inserts reported for that table,
I've checked that TAB1TABLE tablespace is NO ASSM and extent management is local with uniform size 1M .
So this is not obvious free list problem . Kind of strange for me .
Any ideas greatly appreciated :).We can't tell if you have a problem - only you (or your users) can know.
But you've shown us a statspack snapshot covering 4 hours and in that time you've reported about 30 hours of database time (sum foreground "in-database" waits and CPU), with a fairly small number of sessions which (allowing for background sessions) means most of your foreground sessions seem to be working pretty much non-stop for the entire period. I could take a guess and say that you would like some of the work that they're doing completed sooner.
The largest fraction of your time goes into waiting for messages from db link, with an average time of 55ms - maybe you have a network problem, maybe you have a query that has a bad choice of execution path that is doing lots of unnecessary trips to the remote db, maybe the queries that get to the remote db could be made much more efficient. (Look for 'sql ordered by executions' in a statspack from the remote db for clues).
pl/sql lock timer is the next big chunk of time - but this is deliberately coded waits in pl/sql (dbms_lock.sleep) maybe that's supposed to be happening, but you could check the logic to see if some "slow" processes are actually coded to sleep much longer than necessary.
Your db file sequential reads (single block reads) are, on average taking 5.5 ms - which is reasonable, so you have to ask if the number (and we know which table a lot of them are hitting) is reasonable. This brings us to your buffer busy waits: these can be caused by updates and deletes as well as inserts, but in 9i they are also caused by "read by other session" - so the buffer busy wait may simple be one session waiting for another session to complete a db file sequential read.
I'd look at your "SQL ordered by Reads" to see if you have some inefficient execution plans (or poorly defined indexes) that result in large amounts of the critical table being constantly re-read. It's possible that you can eliminate redundant visits to this table and reduce your I/O, BBW, and CPU in one shot.
Regards
Jonathan Lewis -
How to tune buffer busy waits in RAC
Hi,
In our environment we se lot of buffer busy waits.
How can I tune that.
we are using 9i RAC on HACMP.
Regards
MMUThere could be several reasons for buffer busy waits, however the common reason is high logical reads..
Normally they relate to bad SQL, you can try to identify those bad queries using a 10046 trace at level 8 or 12 and then tkrprof the trace file and look at the output.
In a RAC environment you will see global buffer busy waits which again relates to buffer busy waits at the instance level. -
How to reduce buffer busy waits, session hanging due to buffer busy waits
Hi,
How to reduce buffer busy waits, session hanging due to buffer busy waits.
Thanks,
Sathis.When I see through enterprise manager I see lot of
tables with buffer busy waits.
Is there any way by table name we can check the
blocks info.
The simple way is to look at the SQL statement and corresponding table name?
P1=file#, P2=block#. You can extract segment name(table or index) using this info.
Query v$bh like following:
SQL> select file#, block#, class#, objd from v$bh where file# = P1 and block# = P2;
SQL> select object_name from all_objects where object_id = <objd>;See following doc:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_1051.htm
Or you can dump block:
SQL> alter system dump datafie <P1> block <P2>;Some excerpts from block dump:
scn: 0x07df.17e70782 seq: 0x01 flg: 0x04 tail: 0x07822301
frmt: 0x02 chkval: 0x61d0 type: 0x23=PAGETABLE SEGMENT HEADER
Map Header:: next 0x00000000 #extents: 1 obj#: 55881 flag: 0x10000000>
Can we do something at table level that will reduce
the waits.
Yes, some methods are known. But before thinking of that, you must verify which block class and which access are involved.
Typo... always. :(
Message was edited by:
Dion_Cho -
Solution for :SIGNIFICANT "BUFFER BUSY WAITS" FOR AN PARTICULAR AQ TABLE
Hi,
My customer is observing buffer busy waits for a particular table we have these options to remove this:
Buffer busy waits are common in high volume AQ systems (just the way the
AQ works),
so what options do we have to reduce this contention
1. Iis partitioning supported
2. should we unlock the stats and gather them
3. any custom indexes that can be used to help reduce
4. any changes to segment storage options
WE require answer very fast. Many thanks in advance!!!906748 wrote:
Hi,
My customer is observing buffer busy waits for a particular table we have these options to remove this:
Buffer busy waits are common in high volume AQ systems (just the way the
AQ works),
so what options do we have to reduce this contention
1. Iis partitioning supported
2. should we unlock the stats and gather them
3. any custom indexes that can be used to help reduce
4. any changes to segment storage optionsHow does this performance issue relate specifically to the o-o tehnology of PL/SQL and SQL?
WE require answer very fast. Many thanks in advance!!!Then use Oracle Support. That is what PAID support is for.
Or do you expect professionals with jobs, spending their free time to assist others here, to simply stop doing what they get paid to do, and jump to your demands for an urgent resolution for you problem... for free?
Think again. -
SMON observing buffer busy waits
select *from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - ProductionI am truing to split one MAX partition into two partitions but my split operation is failing with ORA-0155. When i tried to find row-count in MAX partition using select count(*), i got ORA-0155 again. Table size is 32 G and partition size of MAX partition is just 2.5 GB. I have Auto Undo Management with UNDO tablespace sized at 32 GB. Compression is ENABLE (DIRECT LOAD ONLY) for every partitions. I have daily partitions and partition count is 79.
select inst_id, max(maxquerylen)
from gv$undostat
group by inst_id;
INST_ID MAX(MAXQUERYLEN)
1 26437
SELECT DISTINCT STATUS, SUM(BYTES), COUNT(*) FROM DBA_UNDO_EXTENTS GROUP BY STATUS;
STATUS SUM(BYTES) COUNT(*)
UNEXPIRED 15341387776 16293
EXPIRED 177143808 134
ACTIVE 65536 1
SELECT A.SID, A.USERNAME, B.XIDUSN, B.USED_UREC, B.USED_UBLK
FROM V$SESSION A, V$TRANSACTION B
WHERE A.SADDR=B.SES_ADDR;
Did not return any record
SELECT TABLESPACE_NAME,RETENTION FROM DBA_TABLESPACES WHERE TABLESPACE_NAME='UNDO_T1';
TABLESPACE_NAME RETENTION
UNDO_T1 NOGUARANTEE
_in_memory_undo=FALSE
undo_management=AUTO
undo_retention=28800
undo_tablespace=UNDO_T1
select sid,program,logon_time,last_call_et/60/60,sql_hash_value,sql_id,EVENT,P1,P2,P3 from v$session where sid=749;
SID PROGRAM LOGON_TIME LAST_CALL_ET/60/60 EVENT P1 P2 P3
749 [email protected] (SMON) 2010/08/24 06:57:09 4443.34667 buffer busy waits 2 305 33
File#=2 is an UNDO file
select startup_time from v$instance;
STARTUP_TIME
24.Aug.10/06:57:08There is no locking/blocking scene in db.
May i ask why SMON is observing BBW ? I tried to wake-up SMON by 'oradebug wakeup pid' but it did not help.
Edited by: OraDBA02 on Feb 25, 2011 6:48 AM
Edited by: OraDBA02 on Feb 25, 2011 6:49 AMmy split operation is failing with ORA-0155.REALLY?
00155, 00000, "cannot perform work outside of global transaction"
// *Cause: The application tried to perform some work on either an Oracle
// 7.3 server or an Oracle8 server with local transactions disabled
// while outside of a global transaction.
// *Action: Check if the application is connected to an Oracle 7.3 server. The
// Transaction monitor must not return a NULL XID on an AX_REG call
// when the resource manager is Oracle 7.3. If the application is
// connected to an Oracle8 server, either set nolocal=f in the
// xa_open string or start a global transaction prior to attempting
// the work. -
Hello All,
We are running on 6 node 10.2.0.3 windows 64 bit rac environment.
JDE is the erp layer.
There is 1 table named f00950.
This table is accessed(only selects) by user that logs into the JDE for the first time. It also refers to the table as and when required since it is JDE security related.
On this table we are witnessing very high GC buffer busy waits.
So today i re-organised the table with higher PCTFREE (40) (ASSM tablespace) thinking that this would give me benefit and i would see a decrease in this wait.
But the numbers are still the same.
About 20% of non-idle waits are on this event.
I know partitioning can help but since this is a system table, JDE mgmt is not giving me the go-ahead.
What else can i do to reduce this wait.
Application partitioning is not possible.
There is no major performance issue but will soon be as more and more users are added as part of JDE.
thanks for any suggestions..
Satvery high GC buffer busy waits. find hot block by using ASH
http://www.ardentperf.com/2007/09/12/gc-buffer-busy-waits-in-rac-finding-hot-blocks/
When you find that table... ??? so,
My idea:
- increase initrans on tables + indexes ... it should reserver on table + index
example:ALTER TABLE TABLE_NAME INITRANS 10
- make tables + indexes with partitioning
- sequence based index ??? if yes ... and then probably think about reverse key index...
- increase SGA
I know partitioning can help but since this is a system table, JDE mgmt is not giving me the go-ahead.You should... ;)
- On-line Table Reorganization and Redefinition
http://www.oracle.com/technology/products/oracle9i/daily/nov05.html
- Or export , make new tables+indexes (partitions) and then import only data
- Or make new tables+indexes with Create table AS Select
Application partitioning is not possible. - increase initrans on tables + indexes ... it should reserver on table + index
example:ALTER TABLE TABLE_NAME INITRANS 10
- sequence based index ??? if yes ... and then probably think about reverse key index...
- increase SGA
OR check sql statements ... tune them anyway -
I have a 10GR2 database that has performance problems. It can not keep up with the high rates of inserts into a table. These inserts are the results of a 24X7 logging process. These logs are then processed (Read then updated as processed) by an hourly batch process. None of the table are partitioned.
I seem to be getting a high rate of:
"buffer busy waits; data block"
This seems to be on indexes of the tables that received the processed rows from the log, and the log Table.Hi Mark;
The buffer busy waits are on the hour, This is the SQL and its explain plan used to get a batch from the log.
select RLRL_UID, RLRL_RPT_DT, RLRL_RAW_RPT
from
(select
RLRL.RLRL_UID,
RLRL.RLRL_RPT_DT,
RLRL.RLRL_RAW_RPT,
rank () over (order by RLRL.RLRL_UID asc) as RANK_OF_RLRL_UID
from
RLRL_MC_RPT_LOG RLRL,
ALAL_ASSMBLY_LOC ALAL,
ALMC_MICROCONTROLLER ALMC,
ALNT_NETWORK_V ALNT
where
ALAL.ALAL_UID = :B3
and RLRL.RLRL_PARSE_DT is null
and ALAL.ALAL_UID = ALMC.ALAL_UID
and ALAL.LCLC_UID = ALNT.LCLC_UID
and ALAL.KTTR_ALAL_CLASS_UID = UTIL_KT_PKG.GET_KTTR_UID_FROM_REF_VAL ('ALAL_CLASS', 'ALAL_CLASS_IMP')
and RLRL.RLRL_RPT_DT between ALAL.ALAL_EFF_DT and ALAL.ALAL_TRM_DT
and RLRL.RLRL_REPORTING_IP = :B2
and RLRL.RLRL_REPORTING_PORT = :B1
where RANK_OF_RLRL_UID <= :B4
order by RLRL_RPT_DT asc;
Plan
SELECT STATEMENT ALL_ROWSCost: 53,953
15 SORT ORDER BY Cost: 53,953 Bytes: 87,112,707 Cardinality: 114,773
14 VIEW Cost: 35,627 Bytes: 87,112,707 Cardinality: 114,773
13 WINDOW SORT PUSHED RANK Cost: 35,627 Bytes: 12,165,938 Cardinality: 114,773
12 TABLE ACCESS BY INDEX ROWID TABLE APOD_LOG.RLRL_MC_RPT_LOG Cost: 32,865 Bytes: 18,315 Cardinality: 333
11 NESTED LOOPS Cost: 32,867 Bytes: 12,165,938 Cardinality: 114,773
9 NESTED LOOPS OUTER Cost: 2 Bytes: 51 Cardinality: 1
7 NESTED LOOPS Cost: 2 Bytes: 49 Cardinality: 1
4 NESTED LOOPS Cost: 1 Bytes: 36 Cardinality: 1
1 INDEX UNIQUE SCAN INDEX (UNIQUE) APOD_CORE.ALMC_PK Cost: 0 Bytes: 4 Cardinality: 1
3 TABLE ACCESS BY INDEX ROWID TABLE APOD_CORE.ALAL_ASSMBLY_LOC Cost: 1 Bytes: 32 Cardinality: 1
2 INDEX UNIQUE SCAN INDEX (UNIQUE) APOD_CORE.ALAL_PK Cost: 0 Cardinality: 1
6 TABLE ACCESS BY INDEX ROWID TABLE APOD_CORE.ALAL_ASSMBLY_LOC Cost: 1 Bytes: 13 Cardinality: 1
5 INDEX RANGE SCAN INDEX APOD_CORE.ALAL_KTTR_LOCATION_TYPE_FK Cost: 0 Cardinality: 1
8 INDEX UNIQUE SCAN INDEX (UNIQUE) APOD_CORE.ALNT_PK Cost: 0 Bytes: 2 Cardinality: 1
10 INDEX RANGE SCAN INDEX APOD_LOG.RLRL_RPT_DT_I02 Cost: 3,564 Cardinality: 1,241,565
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