Buffer pool size
Oracle 9.2.0.4.0
java 1.4.2
Hi,
How can I set the buffer pool size in oracle 9i?
Thanks
JN
DB_CACHE_SIZE
Parameter type
Big integer
Syntax
DB_CACHE_SIZE = integer [K | M | G]
Default value
48 MB, rounded up to the nearest granule size
Parameter class
Dynamic: ALTER SYSTEM
DB_CACHE_SIZE specifies the size of the DEFAULT buffer pool for buffers with the primary block size (the block size defined by the DB_BLOCK_SIZE parameter).
The value must be at least the size of one granule (smaller values are automatically rounded up to the granule size). A value of zero is illegal because zero is the size of the DEFAULT pool for the standard block size, which is the block size for the SYSTEM tablespace.
[email protected]
Joel P๏ฟฝrez
Similar Messages
-
Buffer pool keep and multiple db block sizes
I have a tablespace with 8k block size (database default) and a tablespace with 16k block size. I have db_cache_size and db_16k_cache_size set (obviously).
Also i have buffer cache keep set in the database.
Question: If a table is placed in a tablespace with 16k block size, and it's buffer pool is keep, does it end up in the keep pool (like tables from 8k tablsepace and keep pool set), or it ends in 16k buffer?You can find in the following online manual
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14220/memory.htm#i16408 -
Issue with shared pool size while upgrading from 10.2.0.4 to 11.2.0.2
Hi Team,
Below is my issue
I am running dbua as part of the upgrade from 10.2.0.4 to 11.2.0.2. Its almost 59% and nothing is happening on the instance. The logs directory contian the below
-bash-3.00$ ls -ltr
total 280
-rw-r----- 1 ora8014 ems8014 3662 Oct 16 08:58 upgrade.xml
-rw-r----- 1 ora8014 ems8014 1127 Oct 16 09:00 Upgrade_Directive.log
-rw-r----- 1 ora8014 ems8014 7452 Oct 16 09:00 mapfile.txt
-rw-r----- 1 ora8014 ems8014 297 Oct 16 09:04 SpaceUsage.txt
-rw-r----- 1 ora8014 ems8014 9803 Oct 16 09:04 PreUpgradeResults.html
-rw-r----- 1 ora8014 ems8014 1572 Oct 16 09:06 PreUpgrade.log
-rw-r----- 1 ora8014 ems8014 2850 Oct 16 09:06 Oracle_Text.log
-rw-r----- 1 ora8014 ems8014 157816 Oct 16 09:09 trace.log
-rw-r----- 1 ora8014 ems8014 71368 Oct 16 09:09 sqls.log
-rw-r----- 1 ora8014 ems8014 339 Oct 16 09:09 Oracle_Server.log
-bash-3.00$ date
Sat Oct 16 22:54:27 PDT 2010
-bash-3.00$ pwd
/slot/ems8014/oracle/app/ora8014/cfgtoollogs/dbua/ebs11i10/upgrade1
It seems its almost more 12 hrs nothing has happened. When I check the oracle_server.log it has the error
-bash-3.00$ tail Oracle_Server.log
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
select count(*) from v$instance
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
ORA-00371: not enough shared pool memory, should be atleast 424463564 bytes
Hence I started the Db in 10g oracle home to check and below is the details.
SQL> select * from V$SGAINFO;
NAME BYTES RES
Fixed SGA Size 1267908 No
Redo Buffers 11313152 No
Buffer Cache Size 614400000 Yes
Shared Pool Size 301989888 Yes
Large Pool Size 8388608 Yes
Java Pool Size 67108864 Yes
Streams Pool Size 50331648 Yes
Granule Size 4194304 No
Maximum SGA Size 1056964608 No
Startup overhead in Shared Pool 188743680 No
Free SGA Memory Available 0
11 rows selected.
I tried to increase the space of shared pool as below
SQL> ALTER SYSTEM SET shared_pool_size ='301M' SCOPE=MEMORY SID='ebs11i10';
ALTER SYSTEM SET shared_pool_size ='301M' SCOPE=MEMORY SID='ebs11i10'
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-04033: Insufficient memory to grow pool
I am stuck and cant proceed further. Could you please help me on this issue so that I overcome this and proceed further.
Thanks
Shyam.These are the logs. Could you please let me know which one you want.
-bash-3.00$ pwd
/slot/ems8014/oracle/app/ora8014/cfgtoollogs/dbua/ebs11i10/upgrade1
-bash-3.00$ ls -ltr
total 280
-rw-r----- 1 ora8014 ems8014 3662 Oct 16 08:58 upgrade.xml
-rw-r----- 1 ora8014 ems8014 1127 Oct 16 09:00 Upgrade_Directive.log
-rw-r----- 1 ora8014 ems8014 7452 Oct 16 09:00 mapfile.txt
-rw-r----- 1 ora8014 ems8014 297 Oct 16 09:04 SpaceUsage.txt
-rw-r----- 1 ora8014 ems8014 9803 Oct 16 09:04 PreUpgradeResults.html
-rw-r----- 1 ora8014 ems8014 1572 Oct 16 09:06 PreUpgrade.log
-rw-r----- 1 ora8014 ems8014 2850 Oct 16 09:06 Oracle_Text.log
-rw-r----- 1 ora8014 ems8014 157816 Oct 16 09:09 trace.log
-rw-r----- 1 ora8014 ems8014 71368 Oct 16 09:09 sqls.log
-rw-r----- 1 ora8014 ems8014 339 Oct 16 09:09 Oracle_Server.log -
No free buffers available in buffer pool default
We encounter this error ORA00379 No free buffers available in buffer pool default with one of our online transaction system.
Initially, the errors occur once every 30 sec, and became less frequent (about twice a day) after the buffers has been increased to the size of Oracle's default medium size database.
Currently, the system is under testing and we have 4 staffs using the same userid to send transactions. Furthermore the size of each transaction is about 3-5mb. Will these issues actually caused Oracle to run out of free buffer spaces?
Please advise.
Thankyou,Kenny
I think your are running your server as dedicated server. Make it multi-threaded server if it is applicable. It will use the resources more efficiently. Otherwise, you have to set your pool size, prespawn, etc to their maximums.
Regards -
How to set the correct shared pool size and db_buffer_cache using awr
Hi All,
I want to how to set the correct size for shared_pool_size and db_cache_size using shared pool advisory and buffer pool advisory of awr report. I have paste the shared and buffer pool advisory of awr report.
Shared Pool Advisory
* SP: Shared Pool Est LC: Estimated Library Cache Factr: Factor
* 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.
Shared Pool Size(M) SP Size Factr Est LC Size (M) Est LC Mem Obj Est LC Time Saved (s) Est LC Time Saved Factr Est LC Load Time (s) Est LC Load Time Factr Est LC Mem Obj Hits (K)
4,096 1.00 471 25,153 184,206 1.00 149 1.00 9,069
4,736 1.16 511 27,328 184,206 1.00 149 1.00 9,766
5,248 1.28 511 27,346 184,206 1.00 149 1.00 9,766
5,760 1.41 511 27,346 184,206 1.00 149 1.00 9,766
6,272 1.53 511 27,346 184,206 1.00 149 1.00 9,766
6,784 1.66 511 27,346 184,206 1.00 149 1.00 9,766
7,296 1.78 511 27,346 184,206 1.00 149 1.00 9,766
7,808 1.91 511 27,346 184,206 1.00 149 1.00 9,766
8,320 2.03 511 27,346 184,206 1.00 149 1.00 9,766
Buffer Pool Advisory
* Only rows with estimated physical reads >0 are displayed
* ordered by Block Size, Buffers For Estimate
P Size for Est (M) Size Factor Buffers (thousands) Est Phys Read Factor Estimated Phys Reads (thousands) Est Phys Read Time Est %DBtime for Rds
D 4,096 0.10 485 1.02 1,002 1 0.00
D 8,192 0.20 970 1.00 987 1 0.00
D 12,288 0.30 1,454 1.00 987 1 0.00
D 16,384 0.40 1,939 1.00 987 1 0.00
D 20,480 0.50 2,424 1.00 987 1 0.00
D 24,576 0.60 2,909 1.00 987 1 0.00
D 28,672 0.70 3,394 1.00 987 1 0.00
D 32,768 0.80 3,878 1.00 987 1 0.00
D 36,864 0.90 4,363 1.00 987 1 0.00
D 40,960 1.00 4,848 1.00 987 1 0.00
D 45,056 1.10 5,333 1.00 987 1 0.00
D 49,152 1.20 5,818 1.00 987 1 0.00
D 53,248 1.30 6,302 1.00 987 1 0.00
D 57,344 1.40 6,787 1.00 987 1 0.00
D 61,440 1.50 7,272 1.00 987 1 0.00
D 65,536 1.60 7,757 1.00 987 1 0.00
D 69,632 1.70 8,242 1.00 987 1 0.00
D 73,728 1.80 8,726 1.00 987 1 0.00
D 77,824 1.90 9,211 1.00 987 1 0.00
D 81,920 2.00 9,696 1.00 987 1 0.00
My shared pool size is 4gb and db_cache_size is 40Gb.
Please help me in configuring the correct size for this.
Thanks and Regards,Hi ,
Actually batch load is taking too much time.
Please find below the 1 hr awr report
Snap Id Snap Time Sessions Cursors/Session
Begin Snap: 6557 27-Nov-11 16:00:06 126 1.3
End Snap: 6558 27-Nov-11 17:00:17 130 1.6
Elapsed: 60.17 (mins)
DB Time: 34.00 (mins)
Report Summary
Cache Sizes
Begin End
Buffer Cache: 40,960M 40,960M Std Block Size: 8K
Shared Pool Size: 4,096M 4,096M Log Buffer: 25,908K
Load Profile
Per Second Per Transaction Per Exec Per Call
DB Time(s): 0.6 1.4 0.00 0.07
DB CPU(s): 0.5 1.2 0.00 0.06
Redo size: 281,296.9 698,483.4
Logical reads: 20,545.6 51,016.4
Block changes: 1,879.5 4,667.0
Physical reads: 123.7 307.2
Physical writes: 66.4 164.8
User calls: 8.2 20.4
Parses: 309.4 768.4
Hard parses: 8.5 21.2
W/A MB processed: 1.7 4.3
Logons: 0.7 1.6
Executes: 1,235.9 3,068.7
Rollbacks: 0.0 0.0
Transactions: 0.4
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 99.66 In-memory Sort %: 100.00
Library Hit %: 99.19 Soft Parse %: 97.25
Execute to Parse %: 74.96 Latch Hit %: 99.97
Parse CPU to Parse Elapsd %: 92.41 % Non-Parse CPU: 98.65
Shared Pool Statistics
Begin End
Memory Usage %: 80.33 82.01
% SQL with executions>1: 90.90 86.48
% Memory for SQL w/exec>1: 90.10 86.89
Top 5 Timed Foreground Events
Event Waits Time(s) Avg wait (ms) % DB time Wait Class
DB CPU 1,789 87.72
db file sequential read 27,531 50 2 2.45 User I/O
db file scattered read 26,322 30 1 1.47 User I/O
row cache lock 1,798 20 11 0.96 Concurrency
OJVM: Generic 36 15 421 0.74 Other
Host CPU (CPUs: 24 Cores: 12 Sockets: )
Load Average Begin Load Average End %User %System %WIO %Idle
0.58 1.50 2.8 0.7 0.1 96.6
Instance CPU
%Total CPU %Busy CPU %DB time waiting for CPU (Resource Manager)
2.2 63.6 0.0
Memory Statistics
Begin End
Host Mem (MB): 131,072.0 131,072.0
SGA use (MB): 50,971.4 50,971.4
PGA use (MB): 545.5 1,066.3
% Host Mem used for SGA+PGA: 39.30 39.70
RAC Statistics
Begin End
Number of Instances: 2 2
Global Cache Load Profile
Per Second Per Transaction
Global Cache blocks received: 3.09 7.68
Global Cache blocks served: 1.86 4.62
GCS/GES messages received: 78.64 195.27
GCS/GES messages sent: 53.82 133.65
DBWR Fusion writes: 0.52 1.30
Estd Interconnect traffic (KB) 65.50
Global Cache Efficiency Percentages (Target local+remote 100%)
Buffer access - local cache %: 99.65
Buffer access - remote cache %: 0.02
Buffer access - disk %: 0.34
Global Cache and Enqueue Services - Workload Characteristics
Avg global enqueue get time (ms): 0.0
Avg global cache cr block receive time (ms): 1.7
Avg global cache current block receive time (ms): 1.0
Avg global cache cr block build time (ms): 0.0
Avg global cache cr block send time (ms): 0.0
Global cache log flushes for cr blocks served %: 1.4
Avg global cache cr block flush time (ms): 0.9
Avg global cache current block pin time (ms): 0.0
Avg global cache current block send time (ms): 0.0
Global cache log flushes for current blocks served %: 0.1
Avg global cache current block flush time (ms): 0.0
Global Cache and Enqueue Services - Messaging Statistics
Avg message sent queue time (ms): 0.0
Avg message sent queue time on ksxp (ms): 0.4
Avg message received queue time (ms): 0.5
Avg GCS message process time (ms): 0.0
Avg GES message process time (ms): 0.0
% of direct sent messages: 79.13
% of indirect sent messages: 17.10
% of flow controlled messages: 3.77
Cluster Interconnect
Begin End
Interface IP Address Pub Source IP Pub Src
en9 10.51.10.61 N Oracle Cluster Repository
Main Report
* Report Summary
* Wait Events Statistics
* SQL Statistics
* Instance Activity Statistics
* IO Stats
* Buffer Pool Statistics
* Advisory Statistics
* Wait Statistics
* Undo Statistics
* Latch Statistics
* Segment Statistics
* Dictionary Cache Statistics
* Library Cache Statistics
* Memory Statistics
* Streams Statistics
* Resource Limit Statistics
* Shared Server Statistics
* init.ora Parameters
More RAC Statistics
* RAC Report Summary
* Global Messaging Statistics
* Global CR Served Stats
* Global CURRENT Served Stats
* Global Cache Transfer Stats
* Interconnect Stats
* Dynamic Remastering Statistics
Back to Top
Statistic Name Time (s) % of DB Time
sql execute elapsed time 1,925.20 94.38
DB CPU 1,789.38 87.72
connection management call elapsed time 99.65 4.89
PL/SQL execution elapsed time 89.81 4.40
parse time elapsed 46.32 2.27
hard parse elapsed time 25.01 1.23
Java execution elapsed time 21.24 1.04
PL/SQL compilation elapsed time 11.92 0.58
failed parse elapsed time 9.37 0.46
hard parse (sharing criteria) elapsed time 8.71 0.43
sequence load elapsed time 0.06 0.00
repeated bind elapsed time 0.02 0.00
hard parse (bind mismatch) elapsed time 0.01 0.00
DB time 2,039.77
background elapsed time 122.00
background cpu time 113.42
Statistic Value End Value
NUM_LCPUS 0
NUM_VCPUS 0
AVG_BUSY_TIME 12,339
AVG_IDLE_TIME 348,838
AVG_IOWAIT_TIME 221
AVG_SYS_TIME 2,274
AVG_USER_TIME 9,944
BUSY_TIME 299,090
IDLE_TIME 8,375,051
IOWAIT_TIME 6,820
SYS_TIME 57,512
USER_TIME 241,578
LOAD 1 2
OS_CPU_WAIT_TIME 312,200
PHYSICAL_MEMORY_BYTES 137,438,953,472
NUM_CPUS 24
NUM_CPU_CORES 12
GLOBAL_RECEIVE_SIZE_MAX 1,310,720
GLOBAL_SEND_SIZE_MAX 1,310,720
TCP_RECEIVE_SIZE_DEFAULT 16,384
TCP_RECEIVE_SIZE_MAX 9,223,372,036,854,775,807
TCP_RECEIVE_SIZE_MIN 4,096
TCP_SEND_SIZE_DEFAULT 16,384
TCP_SEND_SIZE_MAX 9,223,372,036,854,775,807
TCP_SEND_SIZE_MIN 4,096
Back to Wait Events Statistics
Back to Top
Operating System Statistics - Detail
Snap Time Load %busy %user %sys %idle %iowait
27-Nov 16:00:06 0.58
27-Nov 17:00:17 1.50 3.45 2.79 0.66 96.55 0.08
Back to Wait Events Statistics
Back to Top
Foreground Wait Class
* s - second, ms - millisecond - 1000th of a second
* ordered by wait time desc, waits desc
* %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
* Captured Time accounts for 95.7% of Total DB time 2,039.77 (s)
* Total FG Wait Time: 163.14 (s) DB CPU time: 1,789.38 (s)
Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) %DB time
DB CPU 1,789 87.72
User I/O 61,229 0 92 1 4.49
Other 102,743 40 31 0 1.50
Concurrency 3,169 10 24 7 1.16
Cluster 58,920 0 11 0 0.52
System I/O 45,407 0 6 0 0.29
Configuration 107 7 1 5 0.03
Commit 383 0 0 1 0.01
Network 15,275 0 0 0 0.00
Application 52 8 0 0 0.00
Back to Wait Events Statistics
Back to Top
Foreground Wait Events
* s - second, ms - millisecond - 1000th of a second
* Only events with Total Wait Time (s) >= .001 are shown
* ordered by wait time desc, waits desc (idle events last)
* %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn % DB time
db file sequential read 27,531 0 50 2 18.93 2.45
db file scattered read 26,322 0 30 1 18.10 1.47
row cache lock 1,798 0 20 11 1.24 0.96
OJVM: Generic 36 42 15 421 0.02 0.74
db file parallel read 394 0 7 19 0.27 0.36
control file sequential read 22,248 0 6 0 15.30 0.28
reliable message 4,439 0 4 1 3.05 0.18
gc current grant busy 7,597 0 3 0 5.22 0.16
PX Deq: Slave Session Stats 2,661 0 3 1 1.83 0.16
DFS lock handle 3,208 0 3 1 2.21 0.16
direct path write temp 4,842 0 3 1 3.33 0.15
library cache load lock 39 0 3 72 0.03 0.14
gc cr multi block request 37,008 0 3 0 25.45 0.14
IPC send completion sync 5,451 0 2 0 3.75 0.10
gc cr block 2-way 4,669 0 2 0 3.21 0.09
enq: PS - contention 3,183 33 1 0 2.19 0.06
gc cr grant 2-way 5,151 0 1 0 3.54 0.06
direct path read temp 1,722 0 1 1 1.18 0.05
gc current block 2-way 1,807 0 1 0 1.24 0.03
os thread startup 6 0 1 108 0.00 0.03
name-service call wait 12 0 1 47 0.01 0.03
PX Deq: Signal ACK RSG 2,046 50 0 0 1.41 0.02
log file switch completion 3 0 0 149 0.00 0.02
rdbms ipc reply 3,610 0 0 0 2.48 0.02
gc current grant 2-way 1,432 0 0 0 0.98 0.02
library cache pin 903 32 0 0 0.62 0.02
PX Deq: reap credit 35,815 100 0 0 24.63 0.01
log file sync 383 0 0 1 0.26 0.01
Disk file operations I/O 405 0 0 0 0.28 0.01
library cache lock 418 3 0 0 0.29 0.01
kfk: async disk IO 23,159 0 0 0 15.93 0.01
gc current block busy 4 0 0 35 0.00 0.01
gc current multi block request 1,206 0 0 0 0.83 0.01
ges message buffer allocation 38,526 0 0 0 26.50 0.00
enq: FB - contention 131 0 0 0 0.09 0.00
undo segment extension 8 100 0 6 0.01 0.00
CSS initialization 8 0 0 6 0.01 0.00
SQL*Net message to client 14,600 0 0 0 10.04 0.00
enq: HW - contention 96 0 0 0 0.07 0.00
CSS operation: action 8 0 0 4 0.01 0.00
gc cr block busy 33 0 0 1 0.02 0.00
latch free 30 0 0 1 0.02 0.00
enq: TM - contention 49 6 0 0 0.03 0.00
enq: JQ - contention 19 100 0 1 0.01 0.00
SQL*Net more data to client 666 0 0 0 0.46 0.00
asynch descriptor resize 3,179 100 0 0 2.19 0.00
latch: shared pool 3 0 0 3 0.00 0.00
CSS operation: query 24 0 0 0 0.02 0.00
PX Deq: Signal ACK EXT 72 0 0 0 0.05 0.00
KJC: Wait for msg sends to complete 269 0 0 0 0.19 0.00
latch: object queue header operation 4 0 0 1 0.00 0.00
gc cr block congested 5 0 0 0 0.00 0.00
utl_file I/O 11 0 0 0 0.01 0.00
enq: TO - contention 3 33 0 0 0.00 0.00
SQL*Net message from client 14,600 0 219,478 15033 10.04
jobq slave wait 7,726 100 3,856 499 5.31
PX Deq: Execution Msg 10,556 19 50 5 7.26
PX Deq: Execute Reply 2,946 31 27 9 2.03
PX Deq: Parse Reply 3,157 35 3 1 2.17
PX Deq: Join ACK 2,976 28 2 1 2.05
PX Deq Credit: send blkd 7 14 0 4 0.00
Back to Wait Events Statistics
Back to Top
Background Wait Events
* ordered by wait time desc, waits desc (idle events last)
* Only events with Total Wait Time (s) >= .001 are shown
* %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn % bg time
os thread startup 140 0 13 90 0.10 10.35
db file parallel write 8,233 0 6 1 5.66 5.08
log file parallel write 3,906 0 6 1 2.69 4.62
log file sequential read 350 0 5 16 0.24 4.49
control file sequential read 13,737 0 5 0 9.45 3.72
DFS lock handle 2,990 27 2 1 2.06 1.43
db file sequential read 921 0 2 2 0.63 1.39
SQL*Net break/reset to client 18 0 1 81 0.01 1.19
control file parallel write 2,455 0 1 1 1.69 1.12
ges lms sync during dynamic remastering and reconfig 24 100 1 50 0.02 0.98
library cache load lock 35 0 1 24 0.02 0.68
ASM file metadata operation 3,483 0 1 0 2.40 0.65
enq: CO - master slave det 1,203 100 1 0 0.83 0.46
kjbdrmcvtq lmon drm quiesce: ping completion 9 0 1 62 0.01 0.46
enq: WF - contention 11 0 0 35 0.01 0.31
CGS wait for IPC msg 32,702 100 0 0 22.49 0.19
gc object scan 28,788 100 0 0 19.80 0.15
row cache lock 535 0 0 0 0.37 0.14
library cache pin 370 55 0 0 0.25 0.12
ksxr poll remote instances 19,119 100 0 0 13.15 0.11
name-service call wait 6 0 0 19 0.00 0.10
gc current block 2-way 304 0 0 0 0.21 0.09
gc cr block 2-way 267 0 0 0 0.18 0.08
gc cr grant 2-way 355 0 0 0 0.24 0.08
ges LMON to get to FTDONE 3 100 0 24 0.00 0.06
enq: CF - contention 145 76 0 0 0.10 0.05
PX Deq: reap credit 8,842 100 0 0 6.08 0.05
reliable message 126 0 0 0 0.09 0.05
db file scattered read 19 0 0 3 0.01 0.05
library cache lock 162 1 0 0 0.11 0.04
latch: shared pool 2 0 0 27 0.00 0.04
Disk file operations I/O 504 0 0 0 0.35 0.04
gc current grant busy 148 0 0 0 0.10 0.04
gcs log flush sync 84 0 0 1 0.06 0.04
ges message buffer allocation 24,934 0 0 0 17.15 0.02
enq: CR - block range reuse ckpt 83 0 0 0 0.06 0.02
latch free 22 0 0 1 0.02 0.02
CSS operation: action 13 0 0 2 0.01 0.02
CSS initialization 4 0 0 6 0.00 0.02
direct path read 1 0 0 21 0.00 0.02
rdbms ipc reply 153 0 0 0 0.11 0.01
db file parallel read 2 0 0 8 0.00 0.01
direct path write 5 0 0 3 0.00 0.01
gc current multi block request 49 0 0 0 0.03 0.01
gc current block busy 5 0 0 2 0.00 0.01
enq: PS - contention 24 50 0 0 0.02 0.01
gc cr multi block request 54 0 0 0 0.04 0.01
ges generic event 1 100 0 10 0.00 0.01
gc current grant 2-way 35 0 0 0 0.02 0.01
kfk: async disk IO 183 0 0 0 0.13 0.01
Log archive I/O 3 0 0 2 0.00 0.01
gc buffer busy acquire 2 0 0 3 0.00 0.00
LGWR wait for redo copy 123 0 0 0 0.08 0.00
IPC send completion sync 18 0 0 0 0.01 0.00
enq: TA - contention 11 0 0 0 0.01 0.00
read by other session 2 0 0 2 0.00 0.00
enq: TM - contention 9 89 0 0 0.01 0.00
latch: ges resource hash list 135 0 0 0 0.09 0.00
PX Deq: Slave Session Stats 12 0 0 0 0.01 0.00
KJC: Wait for msg sends to complete 89 0 0 0 0.06 0.00
enq: TD - KTF dump entries 8 0 0 0 0.01 0.00
enq: US - contention 7 0 0 0 0.00 0.00
CSS operation: query 12 0 0 0 0.01 0.00
enq: TK - Auto Task Serialization 6 100 0 0 0.00 0.00
PX Deq: Signal ACK RSG 24 50 0 0 0.02 0.00
log file single write 6 0 0 0 0.00 0.00
enq: WL - contention 2 100 0 1 0.00 0.00
ADR block file read 13 0 0 0 0.01 0.00
ADR block file write 5 0 0 0 0.00 0.00
latch: object queue header operation 1 0 0 1 0.00 0.00
gc cr block busy 1 0 0 1 0.00 0.00
rdbms ipc message 103,276 67 126,259 1223 71.03
PX Idle Wait 6,467 67 12,719 1967 4.45
wait for unread message on broadcast channel 7,240 100 7,221 997 4.98
gcs remote message 218,809 84 7,213 33 150.49
DIAG idle wait 203,228 95 7,185 35 139.77
shared server idle wait 121 100 3,630 30000 0.08
ASM background timer 3,343 0 3,611 1080 2.30
Space Manager: slave idle wait 723 100 3,610 4993 0.50
heartbeat monitor sleep 722 100 3,610 5000 0.50
ges remote message 73,089 52 3,609 49 50.27
dispatcher timer 66 88 3,608 54660 0.05
pmon timer 1,474 82 3,607 2447 1.01
PING 1,487 19 3,607 2426 1.02
Streams AQ: qmn slave idle wait 125 0 3,594 28754 0.09
Streams AQ: qmn coordinator idle wait 250 50 3,594 14377 0.17
smon timer 18 50 3,505 194740 0.01
JOX Jit Process Sleep 73 100 976 13370 0.05
class slave wait 56 0 605 10806 0.04
KSV master wait 2,215 98 1 0 1.52
SQL*Net message from client 109 0 0 2 0.07
PX Deq: Parse Reply 27 44 0 1 0.02
PX Deq: Join ACK 30 40 0 1 0.02
PX Deq: Execute Reply 20 30 0 0 0.01
Streams AQ: RAC qmn coordinator idle wait 259 100 0 0 0.18
Back to Wait Events Statistics
Back to Top
Wait Event Histogram
* Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
* % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
* % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
* Ordered by Event (idle events last)
% of Waits
Event Total Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
ADR block file read 13 100.0
ADR block file write 5 100.0
ADR file lock 6 100.0
ARCH wait for archivelog lock 3 100.0
ASM file metadata operation 3483 99.6 .1 .1 .2
CGS wait for IPC msg 32.7K 100.0
CSS initialization 12 50.0 50.0
CSS operation: action 21 28.6 9.5 61.9
CSS operation: query 36 86.1 5.6 8.3
DFS lock handle 6198 98.6 1.2 .1 .1
Disk file operations I/O 909 95.7 3.6 .7
IPC send completion sync 5469 99.9 .1 .0 .0
KJC: Wait for msg sends to complete 313 100.0
LGWR wait for redo copy 122 100.0
Log archive I/O 3 66.7 33.3
OJVM: Generic 36 55.6 44.4
PX Deq: Signal ACK EXT 72 98.6 1.4
PX Deq: Signal ACK RSG 2070 99.7 .0 .1 .0 .1
PX Deq: Slave Session Stats 2673 99.7 .2 .1 .0
PX Deq: reap credit 44.7K 100.0
SQL*Net break/reset to client 20 95.0 5.0
SQL*Net message to client 14.7K 100.0
SQL*Net more data from client 32 100.0
SQL*Net more data to client 689 100.0
asynch descriptor resize 3387 100.0
buffer busy waits 2 100.0
control file parallel write 2455 96.6 2.2 .6 .6 .1
control file sequential read 36K 99.4 .3 .1 .1 .1 .1 .0
db file parallel read 397 8.8 .8 5.5 12.6 17.4 46.3 8.6
db file parallel write 8233 85.4 10.3 2.3 1.4 .4 .1
db file scattered read 26.3K 79.2 1.5 8.2 10.5 .6 .1 .0
db file sequential read 28.4K 60.2 3.3 18.0 18.1 .3 .1 .0
db file single write 2 100.0
direct path read 2 50.0 50.0
direct path read temp 1722 95.8 2.8 .1 .5 .8 .1
direct path write 6 83.3 16.7
direct path write temp 4842 96.3 2.7 .5 .2 .0 .0 .2
enq: AF - task serialization 1 100.0
enq: CF - contention 145 99.3 .7
enq: CO - master slave det 1203 98.9 .8 .2
enq: CR - block range reuse ckpt 83 100.0
enq: DR - contention 2 100.0
enq: FB - contention 131 100.0
enq: HW - contention 97 100.0
enq: JQ - contention 19 89.5 10.5
enq: JS - job run lock - synchronize 3 100.0
enq: MD - contention 1 100.0
enq: MW - contention 2 100.0
enq: PS - contention 3207 99.5 .4 .1
enq: TA - contention 11 100.0
enq: TD - KTF dump entries 8 100.0
enq: TK - Auto Task Serialization 6 100.0
enq: TM - contention 58 100.0
enq: TO - contention 3 100.0
enq: TQ - DDL contention 1 100.0
enq: TS - contention 1 100.0
enq: UL - contention 1 100.0
enq: US - contention 7 100.0
enq: WF - contention 11 81.8 18.2
enq: WL - contention 2 50.0 50.0
gc buffer busy acquire 2 50.0 50.0
gc cr block 2-way 4934 99.9 .1 .0 .0
gc cr block busy 35 68.6 31.4
gc cr block congested 6 100.0
gc cr disk read 2 100.0
gc cr grant 2-way 4824 100.0 .0
gc cr grant congested 2 100.0
gc cr multi block request 37.1K 99.8 .2 .0 .0 .0 .0 .0
gc current block 2-way 2134 99.9 .0 .0
gc current block busy 7 14.3 14.3 14.3 28.6 28.6
gc current block congested 2 100.0
gc current grant 2-way 1337 99.9 .1
gc current grant busy 7123 99.2 .2 .2 .0 .0 .3 .1
gc current grant congested 2 100.0
gc current multi block request 1260 99.8 .2
gc object scan 28.8K 100.0
gcs log flush sync 65 95.4 3.1 1.5
ges LMON to get to FTDONE 3 100.0
ges generic event 1 100.0
ges inquiry response 2 100.0
ges lms sync during dynamic remastering and reconfig 24 16.7 29.2 54.2
ges message buffer allocation 63.1K 100.0
kfk: async disk IO 23.3K 100.0 .0 .0
kjbdrmcvtq lmon drm quiesce: ping completion 9 11.1 88.9
ksxr poll remote instances 19.1K 100.0
latch free 52 59.6 40.4
latch: call allocation 2 100.0
latch: gc element 1 100.0
latch: gcs resource hash 1 100.0
latch: ges resource hash list 135 100.0
latch: object queue header operation 5 40.0 40.0 20.0
latch: shared pool 5 40.0 20.0 20.0 20.0
library cache load lock 74 9.5 5.4 8.1 17.6 10.8 13.5 35.1
library cache lock 493 99.2 .4 .4
library cache pin 1186 98.4 .3 1.2 .1
library cache: mutex X 6 100.0
log file parallel write 3897 72.9 1.5 17.1 7.5 .6 .3 .1
log file sequential read 350 4.6 3.1 59.4 30.0 2.9
log file single write 6 100.0
log file switch completion 3 33.3 66.7
log file sync 385 90.4 3.6 4.7 .8 .5
name-service call wait 18 5.6 5.6 5.6 16.7 44.4 22.2
os thread startup 146 100.0
rdbms ipc reply 3763 99.7 .3
read by other session 2 50.0 50.0
reliable message 4565 99.7 .2 .0 .0 .1
row cache lock 2334 99.3 .2 .1 .1 .3
undo segment extension 8 50.0 37.5 12.5
utl_file I/O 11 100.0
ASM background timer 3343 57.0 .3 .1 .1 .1 21.1 21.4
DIAG idle wait 203.2K 3.4 .2 .4 18.0 41.4 14.8 21.8
JOX Jit Process Sleep 73 2.7 97.3
KSV master wait 2213 99.4 .1 .2 .3
PING 1487 81.0 19.0
PX Deq Credit: send blkd 7 57.1 14.3 14.3 14.3
PX Deq: Execute Reply 2966 59.8 .8 9.5 5.6 10.2 2.6 11.4
PX Deq: Execution Msg 10.6K 72.4 12.1 2.6 2.5 .1 5.6 4.6 .0
PX Deq: Join ACK 3006 77.9 22.1 .1
PX Deq: Parse Reply 3184 67.1 31.1 1.6 .2
PX Idle Wait 6466 .2 8.7 4.3 4.8 .3 .1 5.0 76.6
SQL*Net message from client 14.7K 72.4 2.8 .8 .5 .9 .4 2.8 19.3
Space Manager: slave idle wait 722 100.0
Streams AQ: RAC qmn coordinator idle wait 259 100.0
Streams AQ: qmn coordinator idle wait 250 50.0 50.0
Streams AQ: qmn slave idle wait 125 100.0
class slave wait 55 67.3 7.3 1.8 5.5 1.8 7.3 9.1
dispatcher timer 66 6.1 93.9
gcs remote message 218.6K 7.7 1.8 1.2 1.6 1.7 15.7 70.3
ges remote message 72.9K 29.7 5.1 2.7 2.2 1.5 4.0 54.7
heartbeat monitor sleep 722 100.0
jobq slave wait 7725 .1 .0 99.9
pmon timer 1474 18.4 81.6
rdbms ipc message 103.3K 20.7 2.7 1.5 1.3 .9 .7 40.7 31.6
shared server idle wait 121 100.0
smon timer 18 100.0
wait for unread message on broadcast channel 7238 .3 99.7
Back to Wait Events Statistics
Back to Top
Wait Event Histogram Detail (64 msec to 2 sec)
* Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
* Units for % of Total Waits: ms is milliseconds s is 1024 milliseconds (approximately 1 second)
* % of Total Waits: total waits for all wait classes, including Idle
* % of Total Waits: value of .0 indicates value was <.05%; value of null is truly 0
* Ordered by Event (only non-idle events are displayed)
% of Total Waits
Event Waits 64ms to 2s <32ms <64ms <1/8s <1/4s <1/2s <1s <2s >=2s
ASM file metadata operation 6 99.8 .1 .1
DFS lock handle 6 99.9 .1 .0
OJVM: Generic 16 55.6 2.8 41.7
PX Deq: Signal ACK RSG 3 99.9 .0 .1
PX Deq: Slave Session Stats 3 99.9 .0 .0 .0
SQL*Net break/reset to client 1 95.0 5.0
control file sequential read 1 100.0 .0
db file parallel read 34 91.4 8.6
db file scattered read 4 100.0 .0 .0
db file sequential read 6 100.0 .0 .0 .0
direct path write temp 11 99.8 .1 .1 .0
enq: WF - contention 2 81.8 18.2
gc cr block 2-way 1 100.0 .0
gc cr multi block request 1 100.0 .0
gc current block 2-way 1 100.0 .0
gc current block busy 2 71.4 28.6
gc current grant busy 8 99.9 .0 .1
ges lms sync during dynamic remastering and reconfig 13 45.8 20.8 33.3
kjbdrmcvtq lmon drm quiesce: ping completion 8 11.1 11.1 77.8
latch: shared pool 1 80.0 20.0
library cache load lock 26 64.9 14.9 12.2 4.1 4.1
log file parallel write 2 99.9 .0 .0
log file sequential read 10 97.1 2.0 .6 .3
log file switch completion 2 33.3 66.7
name-service call wait 4 77.8 22.2
os thread startup 146 100.0
reliable message 4 99.9 .0 .1
row cache lock 2 99.7 .0 .0 .3
Back to Wait Events Statistics
Back to Top
Wait Event Histogram Detail (4 sec to 2 min)
* Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
* Units for % of Total Waits: s is 1024 milliseconds (approximately 1 second) m is 64*1024 milliseconds (approximately 67 seconds or 1.1 minutes)
* % of Total Waits: total waits for all wait classes, including Idle
* % of Total Waits: value of .0 indicates value was <.05%; value of null is truly 0
* Ordered by Event (only non-idle events are displayed)
% of Total Waits
Event Waits 4s to 2m <2s <4s <8s <16s <32s < 1m < 2m >=2m
row cache lock 6 99.7 .3
Back to Wait Events Statistics
Back to Top
Wait Event Histogram Detail (4 min to 1 hr)
No data exists for this section of the report.
Back to Wait Events Statistics
Back to Top
Service Statistics
* ordered by DB Time
Service Name DB Time (s) DB CPU (s) Physical Reads (K) Logical Reads (K)
ubshost 1,934 1,744 445 73,633
SYS$USERS 105 45 1 404
SYS$BACKGROUND 0 0 1 128
ubshostXDB 0 0 0 0
Back to Wait Events Statistics
Back to Top
Service Wait Class Stats
* Wait Class info for services in the Service Statistics section.
* Total Waits and Time Waited displayed for the following wait classes: User I/O, Concurrency, Administrative, Network
* Time Waited (Wt Time) in seconds
Service Name User I/O Total Wts User I/O Wt Time Concurcy Total Wts Concurcy Wt Time Admin Total Wts Admin Wt Time Network Total Wts Network Wt Time
ubshost 60232 90 2644 4 0 0 13302 0
SYS$USERS 997 2 525 19 0 0 1973 0
SYS$BACKGROUND 1456 2 1258 14 0 0 0 0
I am not able to paste the whole awr report. I have paste some of the sections of awr report.
Please help.
Thanks and Regards, -
Db_keep_cache_size shows 0 when i keep object in KEEP buffer pool !
Dear Frineds ,
I use Oracle 10g . Form the oracle 10g documentaiton, I get the following information regarding ASMM (Automatic Shared Memory Management) :
The following pools are manually sized components and are not affected by Automatic Shared Memory Management:
Log buffer
Other buffer caches (such as KEEP, RECYCLE, and other non-default block size)
Fixed SGA and other internal allocations
Now plz see the following examle :
1) SQL> select sum(bytes)/1024/1024 " SGA size used in MB" from v$sgastat where name!='free memory';
SGA size used in MB
247.09124
2) SQL> show parameter keep_
NAME TYPE VALUE
db_keep_cache_size big integer 0 (Here db_keep_cache_size is 0 )
3) Now I keep the scott's dept table to KEEP cache :
SQL> select owner,segment_type,segment_name,buffer_pool from dba_segments where buffer_pool != 'DEFAULT';
no rows selected
SQL> alter table scott.dept storage(BUFFER_POOL KEEP);
Table altered.
SQL> select owner,segment_type,segment_name,buffer_pool from dba_segments where buffer_pool != 'DEFAULT';
OWNER SEGMENT_TYPE SEGMENT_NAME
SCOTT TABLE DEPT
4)
After doing this , I have to see the following parameter :
SQL> show parameter keep
NAME TYPE VALUE
db_keep_cache_size big integer 0
SQL> select sum(bytes)/1024/1024 " SGA size used in MB" from v$sgastat where name!='free memory';
SGA size used in MB
246.76825
Here I see that my sga is used but "db_keep_cache_size" still shows the '0' .
Can u plz explain why this parameter value shows '0' now ?
Thx in advance ... ...Hi,
I am not sure I have understood the question fully but if you are trying to monitor usage of the buffer pools you should use some of the dynamic views like in the example query below. If this is not what you are interested in let me know.
SELECT NAME, BLOCK_SIZE, SUM(BUFFERS)
FROM V$BUFFER_POOL
GROUP BY NAME, BLOCK_SIZE
HAVING SUM(BUFFERS) > 0; -
How to configure params for buffer pool for named data cache?
when create a named data cache on ase 12.5, it will setup 2K I/O buffer pool by default with Configured size=0, wash size = 60M
1. if 2K can be changed to 8K for this buffer pool?
2. If add another 16k buffer pool, should Affected Pool be changed to the right pool?
3. How to decide then pagesize, configured size and wash size for a buffer pool? Are they part of total memory size allocated for this cache?> 1. if 2K can be changed to 8K for this buffer pool?
You should be able to create an 8K i/o pool, then drop the 2k pool by setting its size to 0.
> 2. If add another 16k buffer pool, should Affected Pool be changed to the right pool?
If you don't specify the Affected Pool (when calling sp_poolconfig), the procedure uses the pool with the smallest i/o.ย So if you had an 8k but not had dropped the 2k, the space for the new 16k pool would come from the 8k pool.
> 3. How to decide then pagesize, configured size and wash size for a buffer pool? Are they part of total memory size allocated for this cache?
The wash is included in the pool. I don't think it usually needs to be adjusted.
Which page size pools to have will depend on how the cache is used.ย Tables with a clustered index that have a lot of range queries will benefit from larger page size pools, as will text/image/java.ย ย Syslogs is said to do well on a 4k pool.
-bret -
How to calculate the shared pool size ..........
Does anyone know if there is a decent algorithm/method to calculate the shared pool size in Oracle 8.1.7.
look my answer on your thread about db cache size
How to Calculate the DB Block Buffer value. -
MULTIPLE BUFFER POOL์ ๊ฐ๋ ๋ฐ ์ฌ์ฉ ๋ฐฉ๋ฒ (ORACLE8)
์ ํ : ORACLE SERVER
์์ฑ๋ ์ง : 1999-05-13
Multiple Buffer Pool์ ๊ฐ๋ ๋ฐ ์ฌ์ฉ ๋ฐฉ๋ฒ
1. ํ์์ฑ
table์ด๋ index ๋ฑ segment๋ ๊ทธ ์ฌ์ฉ ๋น๋๋ ์ค์๋ ๋ฑ์ ๋ฐ๋ผ memory์
buffering๋๋ ๊ฒ์ ๋ฌ๋ฆฌ ํ ํ์๊ฐ ์๋ค. Oracle8์์๋ buffer cache์ ๋ํด์
multiple buffer pool์ด๋ผ๋ ์๋ก์ด ํน์ฑ์ ๊ฐ๋ ์ ์ ๊ณตํ์ฌ segment๋ง๋ค ๋ค๋ฅธ
buffer๋ฅผ ์ฌ์ฉํ ์ ์๋๋ก ํ๊ณ ์๋ค.
multiple buffer pool์ 'keep', 'recycle', ๊ทธ๋ฆฌ๊ณ 'default' buffer pool๋ก
๊ตฌ์ฑ๋๋ฉฐ, ์ด๊ฒ์ controlํ๊ธฐ ์ํ internal algorithm์ ํ๋์ buffer pool์
์ฌ์ฉํ ๋์ ๋๋ถ๋ถ ๋ง์ฐฌ๊ฐ์ง๋ค. ์ฆ, ๊ธฐ์กด์ CACHE option์ด๋ full table scan ์
LRU end์ ์์น์ํค๋ ๊ฒ ๋ฑ์ ๋ชจ๋ ๋ณํจ์ด ์์ผ๋ฉฐ, ๋จ์ง ๊ทธ๋ฌํ ๊ธฐ๋ฒ๋ค์ด ๊ฐ
buffer๋ง๋ค ๋ณ๋๋ก ์ ์ฉ๋๋ค๋ ๊ฒ ๋ฟ์ด๋ค.
2. buffer์ ์ข ๋ฅ
multiple buffer pool์ ์ฃผ์ ๋ชฉ์ ์ ์๋ก ๋ค๋ฅธ ํํ๋ก ์ฌ์ฉ๋๋ ๊ฒ์ ๋๋์ด ๋
์ ์๋ก ๋ฐฉํด๊ฐ ๋์ง ์๋๋ก ํ๋ ๊ฒ์ผ๋ก ์ ๋ฆฌํ ์ ์์ผ๋ฉฐ, ๊ฐ๊ฐ ๋ค์๊ณผ ๊ฐ์
๊ฒฝ์ฐ์ ์ฌ์ฉํ๋๋ก ํ๋ค.
(1) KEEP buffer pool : ๊ฐ๋ฅํ ํ memory์ ์ค๋ซ๋์ ์ ์ง๋์ด์ ธ์ผ ํ๋
segment๋ฅผ ์ํด ์ฌ์ฉ๋์ด์ ธ์ผ ํ๋ค. ์์ฃผ ์ฌ์ฉ๋์ด์ง๊ณ cache size์ ์ฝ 10%
์ ํ์ ํฌ๊ธฐ๋ฅผ ๊ฐ์ง segment๊ฐ ์ด pool์ ์ฌ์ฉํ๊ธฐ์ ์ ๋นํ๋ค.
๊ทธ๋ฌ๋, ์ฌ๊ธฐ์์๋ Oracle7.3์ CACHE option๊ณผ ๋ง์ฐฌ๊ฐ์ง๋ก ์๋ก์ด access
๋๋ segment์ ์ํด LRU end ์ชฝ์ผ๋ก ์ด๋ํ๋ ๊ฒ์ด ๊ฐ๋ฅํ๋ฏ๋ก ํญ์ cache
๋๋ค๊ณ ๋ณด์ฅํ ์๋ ์๋ค.
์ ๋นํ ํฌ๊ธฐ๋ก ์ง์ ํ๋ ๊ฒ์ด ์ค์ํ๋ฐ ๋น์ฐํ, ๋์์ memory์ ์ฌ๋ ค์ง๊ธฐ๋ฅผ
๋ฐ๋ผ๋ object๋ค์ ํฌ๊ธฐ์ ํฉ๋ณด๋ค๋ ์ปค์ผ ํ๋ค.
(2) RECYCLE buffer pool : ์์ฃผ ์ฌ์ฉ๋์ด์ง์ง ์๊ฑฐ๋, buffer pool์ ๋๋ฐฐ๋ณด๋ค
ํฐ ์ ๋์ ํฐ segment๊ฐ index search๋ฅผ ํ๋ ์์ ๋ฑ์ ์ฌ์ฉ๋์ด์ง๋๋ก ํ๋ค.
(3) DEFAULT buffer pool : ์์ ๋ buffer pool์ ํ ๋น๋์ง ์์ ๋๋จธ์ง๋
default buffer pool์ด ๋๋ค. ๊ทธ๋ฌ๋ฏ๋ก KEEP์ด๋ RECYCLE buffer pool์
์์ด๋ ๋ฐ๋์ default buffer pool์ ์กด์ฌํ๊ฒ ๋๋ค.
์ด buffer pool์ Oracle7์ ํ๋์ buffer pool๊ณผ ๊ฐ๋ค.
3. buffer pool์ ์ค์ ํ๋ ๋ฐฉ๋ฒ
์ด๋ฌํ ์ข ๋ฅ์ buffer pool์ ์ง์ ํ๊ธฐ ์ํด์ BUFFER_POOL_KEEP๊ณผ
BUFFER_POOL_RECYCLE์ด๋ผ๋ parameter๊ฐ ์กด์ฌํ๋ฉฐ, DB_BLOCK_BUFFERS
์ DB_BLOCK_LRU_LATCHES parameter๋ ํจ๊ป ๊ณ ๋ คํ์ฌ์ผ ํ๋ค.
syntax๋ ๋ค์๊ณผ ๊ฐ๋ค.
BUFFER_POOL_KEEP=(buffers:<value>,lru_latches:<value>) ํน์
BUFFER_POOL_KEEP=<value>
BUFFER_POOL_RECYCLE=(buffers:<value>,lru_latches:<value>) ํน์
BUFFER_POOL_RECYCLE=<value>
์์ syntax์์ ๋ณด๋ ๋ฐ์ ๊ฐ์ด ๊ฐ pool์ ๋ํด์ buffer์ ๊ฐฏ์ ๋ฟ ์๋๋ผ
LRU latch์ ๊ฐฏ์๋ ์ง์ ํ ์ ์๋ค. ๋ง์ฝ ์ง์ ํ์ง ์์ผ๋ฉด ๊ทธ pool์ ๋ํด์
ํ๋์ latch๊ฐ ํ ๋น๋๋ ๊ฒ์ด๋ค.
DEFAULT pool์ ๋ํด์๋ ๋ช ์์ ์ผ๋ก block์ ๊ฐฏ์๋ latch์ ๊ฐฏ์๋ฅผ ์ง์ ํ
์ ์๊ณ , ๋์ ์ ์ฒด block์ ๊ฐฏ์ (DB_BLOCK_BUFFERS)์ ์ ์ฒด LRU latch์
๊ฐฏ์ (DB_BLOCK_LRU_LATCHES)์์ KEEP๊ณผ RECYCLE์ ํ ๋น๋ ๊ฐ๊ฐ์
๊ฐ์ ๋บ ๊ฒ๋งํผ default pool์ ํ ๋น๋๋ค.
๊ฐ๋จํ ์์ ๋ก ์ค๋ช ํ๋ฉด ๋ค์๊ณผ ๊ฐ๋ค.
์๋ฅผ ๋ค์ด initSID.ora file์ ๋ค์๊ณผ ๊ฐ์ด parameter๊ฐ ์ค์ ๋์ด ์๋ค๊ณ ๊ฐ์ ํ๋ค.
DB_BLOCK_BUFFERS=1000
DB_BLOCK_LRU_LATCHES=6
BUFFER_POOL_KEEP=(buffers:400,lru_latches:2)
BUFFER_POOL_RECYCLE=100
์ด๋ฌํ ๊ฒฝ์ฐ KEEP pool์ ๋ํด์๋ 400๊ฐ์ block๊ณผ 2๊ฐ์ LRU latch๊ฐ ํ ๋น
๋๊ณ RECYCLE pool์๋ 100๊ฐ์ block๊ณผ 1๊ฐ์ LRU latch๊ฐ ํ ๋น๋๋ค. ๊ทธ๋ฆฌ
๊ณ DEFAULT pool์๋ 500 (1000-400-100) ๊ฐ์ block๊ณผ 3 (6-2-1)๊ฐ์ LRU latch
๊ฐ ํ ๋น๋๊ฒ ๋๋ค.
๊ฐ LRU queue์ ๋ํด์ block์ ๊ท ๋ฑํ๊ฒ ๋ฐฐ๋ถ๋๋ค.
์ฆ, ์ด ์์์ DEFAULT queue๋ LRU 1๋ฒ์ด 167๊ฐ์ block์ LRU2๋ 167๊ฐ, ๊ทธ๋ฆฌ
๊ณ LRU3์ 166๊ฐ์ block์ ๊ฐ์ง๊ฒ ๋๋ฉฐ, KEEP queue๋ ๋๊ฐ์ latch๊ฐ ๊ฐ๊ฐ
200๊ฐ์ฉ์ block์ ๊ทธ๋ฆฌ๊ณ RECYCLE queue๋ 100๊ฐ์ block์ ๊ฐ์ง๊ฒ ๋๋ค.
์ด๋ฌํ ์ ๋ณด๋ v$buffer_pool์ ํตํด ํ์ธ์ด ๊ฐ๋ฅํ๋ฉฐ,
์ด ์์ ๊ฒฝ์ฐ ๋ค์๊ณผ ๊ฐ์ด ์กฐํ๋๋ค. ์ฌ๊ธฐ์์ set_count๊ฐ ๊ฐ pool์ ํ ๋น๋
latch์ ๊ฐฏ์์ด๋ฉฐ, lo_bnum๊ณผ hi_bnum์ด buffer์ range์ด๋ค.
SQL> select * from v$buffer_pool;
NAME LO_SETID HI_SETID SET_COUNT BUFFERS LO_BNUM HI_BNUM
0 0 0 0 0 0
KEEP 4 5 2 400 0 399
RECYCLE 6 6 1 100 400 499
DEFAULT 1 3 3 500 500 999
๊ฐ queue๋ ์ต์ 50๊ฐ์ block์ ํ ๋น๋ฐ์์ผ ํ๋ฉฐ, ๊ทธ๋ ์ง ์์ ๊ฒฝ์ฐ์๋ ์ค๋ฅ
๊ฐ ๋ฐ์ํ๋ค. ์ฆ ์๋ฅผ ๋ค์ด, BUFFER_POOL_KEEP=(buffers:100, lru_latches:3)๊ณผ
๊ฐ์ด ์ค์ ํ๋ฉด alert.log file์ "Incorrect parameter specification for
BUFFER_POOL_KEEP"์ด๋ผ๋ ์ค๋ฅ ๋ฉ์์ง๊ฐ ์ ํ๊ฒ ๋๋ฉฐ, 100๊ฐ์ block์ ๋ํด์
์ต๋ ๋๊ฐ์ LRU latch๋ง์ด ๊ฐ๋ฅํ๊ฒ ๋๋ค.
4. buffer pool์ ์ง์ ํ๋ ๋ฐฉ๋ฒ
BUFFER_POOL์ด๋ผ๋ Oracle8์์ ์๋ก ์ถ๊ฐ๋ storage ์ ์ parameter๋ฅผ ์ด์ฉ
ํ์ฌ segment๊ฐ ์ฌ์ฉํ default pool์ ์ง์ ํ ์ ์๋ค. segment์ ๋ชจ๋ block์
์ง์ ๋ pool์ ์ฌ์ฉํ๊ฒ ๋๋ฉฐ, ์๋์ ์์ ์ ๊ฐ์ด ์ฌ์ฉํ๋ฉด ๋๋ค.
CREATE TABLE keep_table(t NUMBER(10)) STORAGE (BUFFER_POOL KEEP);
ALTER TABLE recycle_table storage(BUFFER_POOL RECYCLE);
BUFFER_POOL์ tablespace๋ rollback segment์ ๋ํด์๋ ์ง์ ํ ์ ์์ผ๋ฉฐ,
clustered table์ ๋ํด์๋ cluster level์์๋ง ์ง์ ์ด ๊ฐ๋ฅํ๋ค. partition
table์ ๋ํด์๋ ๊ฐ partition๋ณ๋ก pool์ ์ง์ ํ๋ ๊ฒ์ด ๊ฐ๋ฅํ๋ค.
์ผ๋จ segments๊ฐ ์ ๋นํ pool์ ํ ๋น์ด ๋๊ณ ๋ ํ์๋, logical hit ratio๋
free buffer waits์ ๊ฐ์ ๋ค์ํ ํต๊ณ ์ ๋ณด๊ฐ ํ์ธ ๊ฐ๋ฅํ๋ค.
์ด๋ฌํ ํต๊ณ ์ ๋ณด๋ฅผ ๋ด๊ณ ์๋ view๋ v$buffer_pool_statistics์ด๋ฉฐ,
์ด view๋ $ORACLE_HOME/rdbms/admin/catperf.sql์ ์ํํ๋ฉด ์์ฑ๋๋ค. -
Buffer pool Cache is two low .
Dear Experts ,
All of the sudden the producation database buffer pool cacheing had fallen down to 35 %
select
100*(1 - (v3.value / (v1.value + v2.value))) "Cache Hit Ratio [%]"
from
v$sysstat v1, v$sysstat v2, v$sysstat v3
where
v1.name = 'db block gets' and
v2.name = 'consistent gets' and
v3.name = 'physical reads';
When i run this script i am getting '93.9% hit
but
select name,100 - round ((physical_reads/(db_block_gets+consistent_gets))*1
"hit ratio" from v$buffer_pool_statistics;
NAME hit ratio
DEFAULT 34.87
my hit ratio is also about 93% but sudden my database perforamce gone very low .
please advise your valuable suggestion .> {quote:title=user640913 wrote:}{quote}
> Thanks for the Response .
> My DB version 10.2.0.4 on AIX 5.3
>
> there are some lending users . that cause this please help me how to find the stmt that making a troble and to solve it .
> i am copyiing the AWR REPORT with this mail .
>
> AWR REPORT LOAD PROFILE .
>
> Per Second PerTransaction I
> Redo size: 89,912.03 13,411.58
> Logical reads: 55,554.6 8,285.20
> Block changes: 553.50 82.56
> Physical reads: 15,842.52 2,318.37
> Physical writes: 20.93 3.12
> User calls: 269.32 40.17
> Parses: 138.35 20.64
> Hard parses: 4.13 0.62
> Logons: 0.81 0.09
> Executes: 356.3 53.23
> ransactions: 6.70 0
> [eBlocks changed per Read: 1.00 Recursive Call %: 70.83
> Rollback per transaction %: 3.84 Rows per Sort: 103.67
>
Since you're licensed to run the AWR why are you bothering with something as silly as that SQL for the "buffer cache hit ratio" !
You need to compare a "pre-problem" AWR with the current AWR reports to see if you can spot the changes that might be the significant ones, but based purely on the Load Profile that you have shown, you're not really doing much work, but you're doing it the hard way. The figures that stand out are:
{code}
Logical reads: 55,554.6 8,285.20
Physical reads: 15,842.52 2,318.37
{code}
You can check the instance statistics to learn more about what type of read activity is generating these physical reads, and work out whether (a) it's sensible and (b) it's supportable on your number of disc. Having said that - take a look at the "SQL ordered by Reads" section of the report to see which SQL statements are responsible for most of the reads, get the historic plans from the AWR and then work out why the plan changed and how to produce a better plan.
See my note below that explains why my quote of your results is tidier than your original.
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}{code}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in {code}fixed format{code}.
There is a +"Preview"+ tab at the top of the text entry panel. Use this to check what your message will look like before you post the message. If it looks a complete mess you're unlikely to get a response. (Click on the +"Plain text"+ tab if you want to edit the text to tidy it up.) -
Buffer pool parameter vs LRU/MRU
Dear Friends,
I know that in the database buffer cache , the following parameters define the sizes of the caches for buffers :
โย ย ย ย ย Default : DB_CACHE_SIZE
โย ย ย ย ย Keep : DB_KEEP_CACHE_SIZE
โย ย ย ย ย Recycle: DB_RECYCLE_CACHE_SIZE
And also I know LRU and MRU also works in this regards .Now my ques is , when the "keep pool" and " the "buffer pool" is on then LRU and MRU are active ?
Both the above 3 pools and (LRU+MRU) is working together ? I have confusion about that . plz help .. ..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. -
hello,
we have development database 10gR2
ASSM is ON...
and the system memory is
SQL> sho sga
Total System Global Area 293601280 bytes
Fixed Size 1290232 bytes
Variable Size 209715208 bytes
Database Buffers 79691776 bytes
Redo Buffers 2904064 bytes
SQL> sho parameter sga_
NAME TYPE VALUE
sga_max_size big integer 280M
sga_target big integer 280M
SQL> select component,current_size from v$sga_dynamic_components;
COMPONENT CURRENT_SIZE
shared pool 171966464
large pool 4194304
java pool 12582912
streams pool 20971520
DEFAULT buffer cache 79691776
KEEP buffer cache 0
RECYCLE buffer cache 0
DEFAULT 2K buffer cache 0
DEFAULT 4K buffer cache 0
DEFAULT 8K buffer cache 0
DEFAULT 16K buffer cache 0
DEFAULT 32K buffer cache 0
ASM Buffer Cache 0
i need to ping around 5 to 6 tables in keep buffer pool since they are frequently accessed ....so just need help on how can i properly configure the keep buffer pool sizewise...
thank you very muchWhy do you need a keep pool?
Why would the default buffer cache not be sufficient?
See http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1590999000346302363
99.999999999999% of the world does not need, want, nor desire a keep and recycle pool, they add
to your administrative overhead and are for very special edge cases Edited by: Dom Brooks on Apr 19, 2011 12:00 PM -
ORA-04031 on 10g - should I just adjust my SGA POOL SIZE?
Has anyone gotten this message frequently:
ORA-04031: unable to allocate 37536 bytes of shared memory ("shared pool","unknown object","sga heap(1,0)","session parame")
We are a business intelligence application that issues lots of large queries. We just migrated to 10g and we are seeing this every 2-3 days on our testing machine.
In particular, I am not sure about "sga heap"... I would just set my Shared Pool Size higher - currently 144 MB but will this help here? Thoughts?In Oracle 10g a new feature called "automatic memory management" allows the dba to reserve a pool of shared memory that is used to allocate the shared pool, the buffer cache, the java pool and the large pool.
In general, when the database needs to allocate a large object into the shared pool and cannot find contiguous space available, it will automatically increase the shared pool size using free space from other SGA structure.
Since the space allocation is automatically managed by Oracle, the probability of getting ora-4031 errors may be greatly reduced. Automatic Memory Management is enabled when the parameter SGA_TARGET is greater than zero and the current setting can be obtained quering the v$sga_dynamic_components view.
Please refer to the 10g Administration Manual for further reference
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14231/toc.htm -
ORA00379 No free buffers available in buffer pool default
We encounter this error ORA00379 No free buffers available in buffer pool default with one of our online transaction system.
Initially, the errors occur once every 30 sec, and became less frequent (about twice a day) after the buffers has been increased to the size of Oracle's default medium size database.
Currently, the system is under testing and we have 4 staffs using the same userid to send transactions. Furthermore the size of each transaction is about 3-5mb. Will these issues actually caused Oracle to run out of free buffer spaces?
Please advise.
nullkevin,
i am not sure how big is your database or how big it is going to be.this is a memory issue that you are facing. try increase the db_block_buffers i would say an (ballpark *2) idea would be to size it around 200Mb+
(assuming you have loads of memory). for a
50-100 user database typically 200MB + of db_block_buffers and 200Mb+ of shared_pool_size should work.
oracle's default sizes are too generic to work for all. so may be you shld change the init.ora parameters until you get rid of the errors.
mukundan. -
Connection pool size limit error
Hi all,
I am trying to execute a BAPI function from MII, execution fails with the following message;
[ERROR] Unable to make RFC call Exception: [Problem retrieving JCO.Function object: Connection pool <ECC_Server>:800:02:EN:ECCUser is exhausted. The current pool size limit (max connections) is 1 connections.]
[WARN] [SAP_JCo_Function_0] Skipping execution of output links due to action failure.
[ERROR] Uncaught exception from SAP_JCo_Function_0, Problem retrieving JCO.Function object: Connection pool <ECC_Server>:800:02:EN:ECCUser is exhausted. The current pool size limit (max connections) is 1 connections.
Config:
1. In 'SAP MII: Connections' of type JCO and have given pool size to 100.
2. In 'SAP MII: Credential Stores' store is created and same is being used in Start Session.
3. Inย JCO_Function block, we can search for the Function Module and set it.
MII Version:
14.0.2 Build(82)
Am I missing something?
Has any one seen this? please advise.
Thanks,
Message was edited by: Shridhar NCheck if there is another JCo connection configured with the same IP and User. I have found in the past that even though there are two connections configured because they have the same ip and user they are put into one pool with the lowest max pool of the two connections.
Maybe you are looking for
-
After I restore the computer, will I also lose Lion?ย If so, will it be possible to get it back?ย Will it be possible to catch back up to the latest software without having to spend any money?ย I bought and installed Snow Leopard when it came out, bu
-
Interactive quicktime movie from keynote doesn't stream correctly on web
hello, Any help with this would be extremely appreciated as I've been trying to solve the problem for 3 days straight. I've created an interactive slide show in keynote and now want to stream it on my website. The problem is that the finished product
-
Hey guys I've got a couple of folder aliases and I was wondering if it was possible to change their icons, like you can in windows. Thanks
-
HR Renewal 1.0 Suite Page Builder Loading Nonstop
Experts, I tried setting up HR Renewal to test and show the functionality and get this loading screen where I cannot select anything. Has anyone else seen this? I tried with IE and Chrome. Made sure the business functions were activated and also acti
-
Instability in Windows Explorer on 8.1
I have Windows 8.1 on an ASUS T100 tablet. ย A new instability has just shown up: Windows Explorer closes and repeatedly tries to restart, showing a message window, 'Windows Explorer is restarting', but it then switches to 'Windows Explorer has stoppe