Enq TM Contention vs Poor index performance

I have the following issue: I have a lot of Enq TM contention in my database. I then index the relevant tables/columns. This gets rid of the Enq TM issues, but performance is degraded even more due to the massive index reads. We have a good high performance disk system, so that's not the problem.
Has anyone had a similar issue? Aside from testing 101 different possibilities, does anyone have a recommendation on resolving this?
TIA,
Mike

user12201192 wrote:
I have the following issue: I have a lot of Enq TM contention in my database. I then index the relevant tables/columns. This gets rid of the Enq TM issues, but performance is degraded even more due to the massive index reads. We have a good high performance disk system, so that's not the problem.
Has anyone had a similar issue? Aside from testing 101 different possibilities, does anyone have a recommendation on resolving this?
you have a mystery; while we have no clues.
post results from following SQL
SELECT * FROM V$VERSION
HOW To Make TUNING request
SQL and PL/SQL FAQ

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Error Message:_
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One of our customers is hitting enq: MN - contention wait event.
UKJA@ukja102> exec print_table('select * from v$lock_type where type = ''MN'');
TYPE                          : MN
NAME                          : LogMiner
ID1_TAG                       : session ID
ID2_TAG                       : 0
IS_USER                       : NO
DESCRIPTION                   : Synchronizes updates to the LogMiner dictionary
and prevents multiple instances from preparing the same LogMiner session
-----------------The situation is as following
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Holding session and waiting sessions are executing same SQL statement like following.
SELECT SCN, SQL_REDO, SEG_OWNER, SEG_NAME, OPERATION_CODE, CSF,DATA_OBJ#,
XIDUSN || '_' || XIDSLT || '_' || XIDSQN) AS XID, ROW_ID, ROLLBACK, TIMESTAMP FROM V$LOGMNR_CONTENTS
WHERE (OPERATION_CODE IN (7, 36)
OR ( ( ROLLBACK = 0 OR (ROLLBACK = 1 AND CSF = 0) ) AND ( OPERATION_CODE IN (1, 2, 3)
AND ((SEG_OWNER = 'TEST1' AND TABLE_NAME = 'TABLE1')
OR (SEG_OWNER = 'TEST1' AND TABLE_NAME = 'TABLE2')
OR (SEG_OWNER = 'TEST1' AND TABLE_NAME = 'TABLE3')
OR (SEG_OWNER = 'TEST1' AND TABLE_NAME = 'TABLE4')
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OR (SEG_OWNER = 'TEST1' AND TABLE_NAME = 'TABLE6')
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================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

My first test case was flawed, so posted wrong info. :(
Further investigation shows that at certain steps of typical log miner operations need MN lock in exclusive mode. For example, dbms_logmnr.start_logmnr procedure needs exclusive MN lock.
Excerpt from 10704 event trace file.
*** 2009-05-19 13:57:53.812
ksqgtl *** MN-00000000-00000000 mode=6 flags=0x21 timeout=600 ***
ksqgtl: no transaction
ksqgtl: use existing ksusetxn DID
ksqgtl:
     ksqlkdid: 0001-0016-00000014
*** 2009-05-19 13:57:53.828
*** ksudidTrace: ksqgtl
     ksusesdi:   0000-0000-00000000
     ksusetxn:   0001-0016-00000014
ksqgtl: RETURNS 0
*** 2009-05-19 13:57:53.828
ksqrcl: MN,0,0
ksqrcl: returns 0Starting log mining operation would require modification on log miner dictionary.
This means that multiple sessions can't start log mining concurrently, but once they've started successfully other types of jobs can be done concurrently.
Any operation that should access the log miner dictionary would require MN lock. I would contact the customer who reported this problem and let them have more investigation.
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

BI Statistics Highly Aggregated cube 0TCT_CA1 poor load performance

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Hi Guys,
I am running Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production on RHEL5.
I changed my db parameter PARALLEL_MAX_SERVERS from 10 to 20. Now, most of my queries are hanging due to this enq: PS – contention wait event. I looked at the req_dgree from the V$PX_SESSION and it is too high.
I reduced the PARALLEL_MAX_SERVERS back to 10 and still the queries are still hanging and the req_dgree still too high.
How can I fix this situation?
Thanks in advance....

user11979518 wrote:
Hi Guys,
I am running Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production on RHEL5.
I changed my db parameter PARALLEL_MAX_SERVERS from 10 to 20. Now, most of my queries are hanging due to this enq: PS – contention wait event. I looked at the req_dgree from the V$PX_SESSION and it is too high.
I reduced the PARALLEL_MAX_SERVERS back to 10 and still the queries are still hanging and the req_dgree still too high.
How can I fix this situation?do use PARALLEL.
PARALLEL sometimes make SQL slower;.
PARALLEL is NOT magic solution to all/every performance problem.
more is not always better; as you have now learned.
How many cores/CPU exist in this DB Server system?

Enq: HW - contention on RAC

Hi,
Using multiple insert sessions on same table we are having Wait event "enq: HW - contention". Tablespaces is local and assm is used.
version 10.2.0.4.0
Two node RAC.
Any suggestion to reduce? Thinking to allocate more freelists and freelistgroups manually to segment.
Segment is a partition in this case.
Regards
Edited by: user13512691 on Nov 14, 2011 10:25 PM

If so, using a larger uniform extent size should reduce the space management overhead.
Another alternative might be to preallocate extents. Thats correct, solution should be to preallocate extents, because others session are waiting on eng HW contention, as this means first insert statement is allocating new extents. which means other session will wait untill this process completes. I believe allocating new extents are expensive operations which could affect the performance.
BTW - Manually adding Freelists on objects( objects are placed in assm tablespace) would benefit?
or other options is to alter MINEXTENT,MAXEXTENT,NEXTENT.
Is that correct?

Problem with enq:SQ contention

here the problem is more contention with as i shown belo
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can u help on this

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http://www.dba-oracle.com/t_sequence_caching.htm
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Oracle Press author

Enq tc -contention

Hello,
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Oracle 11 r2
windoows server 2003
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Edited by: Oracle Studnet on May 26, 2011 2:51 AM

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Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 100.00 In-memory Sort %: 100.00
Library Hit %: 98.73 Soft Parse %: 98.32
Execute to Parse %: 47.27 Latch Hit %: 100.00
Parse CPU to Parse Elapsd %: 48.23 % Non-Parse CPU: 99.6 Let check my Memory Statistic
Host Mem (MB): 32,757.8 32,757.8
SGA use (MB): 15,680.0 15,680.0 ()
PGA use (MB): 515.2 508.2 why PGA used so small memory? (automatic memory is enable memory_target 25GB)
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ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON = FALSE;
alter system set db_files = 10000 scope = spfile;
alter system set processes = 500 scope = spfile;
alter system set memory_max_target = 25000M scope=spfile;
alter system set memory_target = 25000M scope = spfile;
alter system set workarea_size_policy = manual scope=SPFILE;
alter system set sort_area_size = 204800000 scope=SPFILE;
alter system set hash_area_size = 409600000 scope=SPFILE;
alter system set "_pga_max_size"=2000000000 scope=SPFILE;
alter system set "_smm_max_size"=1073741824 scope=SPFILE;
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why PGA is taking less memory with these settings?
Top 5 Timed Foreground Events
Event Waits Time(s) Avg wait (ms) % DB time Wait Class
enq: TC - contention 3 3,161 1053811 79.56 Other
DB CPU 528 13.28
db file sequential read 73,709 125 2 3.14 User I/O
enq: CF - contention 4 106 26540 2.67 Other
log file sync 391 57 145 1.43 Commit

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Pete van Linden

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lspci
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[2009-11-02 09:00] upgraded renderproto (0.9.3-2 -> 0.11-1)
[2009-11-02 09:00] upgraded libxrender (0.9.4-2 -> 0.9.5-1)
[2009-11-02 09:00] upgraded libxft (2.1.13-1 -> 2.1.14-1)
[2009-11-02 09:00] upgraded libxi (1.2.1-1 -> 1.3-2)
[2009-11-02 09:00] upgraded libxinerama (1.0.99.1-1 -> 1.1-1)
[2009-11-02 09:00] upgraded libxkbfile (1.0.5-1 -> 1.0.6-1)
[2009-11-02 09:00] upgraded libxres (1.0.3-2 -> 1.0.4-1)
[2009-11-02 09:00] upgraded libxtst (1.0.3-2 -> 1.1.0-1)
[2009-11-02 09:00] upgraded libxvmc (1.0.4-2 -> 1.0.5-1)
[2009-11-02 09:00] upgraded libxxf86dga (1.1.1-0.1 -> 1.1.1-1)
[2009-11-02 09:00] upgraded libxxf86misc (1.0.1-2 -> 1.0.2-1)
[2009-11-02 09:00] upgraded mesa (7.5.1-2 -> 7.6-2)
[2009-11-02 09:00] upgraded nautilus (2.28.0-1 -> 2.28.1-1)
[2009-11-02 09:00] upgraded nspr (4.8-1 -> 4.8.2-1)
[2009-11-02 09:00] upgraded openssh (5.3p1-1 -> 5.3p1-2)
[2009-11-02 09:00] upgraded pcre (7.9-1 -> 8.00-1)
[2009-11-02 09:00] upgraded sg3_utils (1.27-2 -> 1.28-1)
[2009-11-02 09:01] upgraded shared-mime-info (0.70-1 -> 0.70-2)
[2009-11-02 09:01] upgraded tightvnc (1.3.10-2 -> 1.3.10-3)
[2009-11-02 09:01] upgraded virtualbox-modules (3.0.8-1 -> 3.0.10-1)
[2009-11-02 09:01] upgraded virtualbox-ose (3.0.8-1 -> 3.0.10-1)
[2009-11-02 09:01] upgraded vte (0.22.2-1 -> 0.22.3-1)
[2009-11-02 09:01] upgraded xf86-input-evdev (2.2.5-1 -> 2.3.0-1)
[2009-11-02 09:01] upgraded xf86-video-ati (6.12.4-1 -> 6.12.99.git20091014-1)
[2009-11-02 09:01] upgraded xf86-video-vesa (2.2.0-1 -> 2.2.1-1)
[2009-11-02 09:01] upgraded xorg-apps (7.5-1.1 -> 7.5-2)
[2009-11-02 09:01] upgraded xorg-font-utils (7.4-3 -> 7.5-2)
[2009-11-02 09:01] upgraded xorg-fonts-alias (1.0.1-2 -> 1.0.2-1)
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[2009-11-02 09:01] upgraded xorg-server (1.6.3.901-1 -> 1.7.1-1)
[2009-11-02 09:01] upgraded xorg-utils (7.4-4 -> 7.5-1)
[2009-11-02 09:01] upgraded xorg-xauth (1.0.3-1 -> 1.0.4-1)
[2009-11-02 09:01] upgraded xorg-xkb-utils (7.4-2 -> 7.5-1)
[2009-11-02 09:01] upgraded xterm (246-1 -> 250-1)
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FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/75dpi:unscaled"
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Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
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EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "LTN"
ModelName "H1996NSL/PNST"
HorizSync 30.0 - 96.0
VertRefresh 50.0 - 160.0
Option "DPMS"
EndSection
Section "Device"
#Option "NoAccel" # [<bool>]
#Option "SWcursor" # [<bool>]
Option "AGPMode" "4" # 
#Option "AGPFastWrite" # [<bool>]
#Option "AGPSize" # 
#Option "GARTSize" # 
#Option "RingSize" # 
#Option "BufferSize" # 
#Option "EnableDepthMoves" # [<bool>]
Option "EnablePageFlip" "on" # [<bool>]
#Option "NoBackBuffer" # [<bool>]
#Option "DMAForXv" # [<bool>]
#Option "FBTexPercent" # 
#Option "DepthBits" # 
#Option "PCIAPERSize" # 
#Option "AccelDFS" # [<bool>]
#Option "IgnoreEDID" # [<bool>]
#Option "DisplayPriority" # [<str>]
#Option "PanelSize" # [<str>]
#Option "ForceMinDotClock" # <freq>
Option "ColorTiling" "on" # [<bool>]
#Option "VideoKey" # 
#Option "RageTheatreCrystal" # 
#Option "RageTheatreTunerPort" # 
#Option "RageTheatreCompositePort" # 
#Option "RageTheatreSVideoPort" # 
#Option "TunerType" # 
#Option "RageTheatreMicrocPath" # <str>
#Option "RageTheatreMicrocType" # <str>
#Option "ScalerWidth" # 
Option "RenderAccel" "on" # [<bool>]
#Option "SubPixelOrder" # [<str>]
#Option "ShowCache" # [<bool>]
#Option "DynamicClocks" # [<bool>]
#Option "VGAAccess" # [<bool>]
#Option "ReverseDDC" # [<bool>]
#Option "LVDSProbePLL" # [<bool>]
#Option "AccelMethod" # <str>
Option "DRI" "on" # [<bool>]
#Option "ConnectorTable" # <str>
#Option "Int10" # [<bool>]
#Option "EXAVSync" # [<bool>]
Identifier "Card0"
Driver "radeon"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024"
EndSubSection
EndSection
Section "DRI"
Group "video"
Mode 0666
EndSection
glxinfo
http://pastebin.com/f71f5461c
BTW I'm not using Compiz. Has anyone an idea what could happen? In Glxgears I'm achieving 1200fps, but working with GIMP is laggy-horror.
THX.
Last edited by Srigi (2009-11-04 07:27:45)

exactly the same here...
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
glxinfo: http://pastebin.com/m75fc2c9
Xorg.0.log: http://pastebin.com/m267826b1
xorg.conf: http://pastebin.com/m75c033c2
greets,
smax

Enq: HW - contention

hi
in my spreport i am getting this enq problem pls tell me how to solve this.
Top 5 Timed Events Avg %Total
~~~~~~~~~~~~~~~~~~ wait Call
Event Waits Time (s) (ms) Time
buffer busy waits 1,480,241 1,024,132 692 64.5
enq: HW - contention 142,929 389,756 2727 24.5
free buffer waits 5,245,113 99,454 19 6.3
enq: US - contention 12,172 19,131 1572 1.2
db file parallel write 5,228 10,397 1989 .7
log_buffer=25m
checkpointtimeout=0
checkpointinterval=0
thanks.

Total System Global Area 599785472 bytes
Fixed Size 1980328 bytes
Variable Size 146802776 bytes
Database Buffers 423624704 bytes
Redo Buffers 27377664 bytes
using 10gr2
simultaniously 150 user will affect the database.In this database we have create 150 tables.the procedure is.after creating this table using afterinsertion procedure to insert the data in table.We were using 150 procedure to insert 150 tables.
declare
counter NUMBER;
sql_string VARCHAR2(2000);
BEGIN FOR counter IN 1..150 LOOP
sql_string := 'CREATE TABLE emp'||counter||'
(id varchar2(10) primary key,
col_a varchar2(10),
col_b date,
col_c varchar2(10),
col_d varchar2(10),
col_e varchar2(10),
col_f varchar2(10),
col_g varchar2(10),
col_h date,
col_i varchar2(10),
col_j varchar2(10),
col_k date,
col_l varchar2(10),
col_m varchar2(10),
col_n varchar2(10),
col_o varchar2(10),
col_p varchar2(10),
col_q date,
col_r varchar2(10),
col_s varchar2(10),
col_t varchar2(10),
col_u varchar2(10),
col_v char(20),
col_w varchar2(10),
col_x date,
col_y varchar2(10),
col_z varchar2(10),
col_aa varchar2(10),
col_bb varchar2(10),
col_cc char(20),
col_dd varchar2(10),
col_ee date,
col_ff varchar2(10),
col_gg varchar2(10),
col_hh varchar2(10),
col_ii varchar2(10),
col_jj char(10),
col_kk varchar2(10),
col_ll date,
col_mm varchar2(10),
col_nn varchar2(10),
col_oo varchar2(10),
col_pp varchar2(10),
col_qq char(10),
col_rr varchar2(10),
col_ss date,
col_tt varchar2(10),
col_uu varchar2(10),
col_vv varchar2(10),
col_ww varchar2(10),
col_xx char(12)
) TABLESPACE employee
PCTFREE 10
INITRANS 10
MAXTRANS 255
STORAGE
INITIAL 50m
next 50M
MAXEXTENTS UNLIMITED
EXECUTE IMMEDIATE sql_string;
END LOOP;
END;
CREATE OR REPLACE procedure afterinsertion1(n in number)
is
a number;
cc number;
BEGIN
cc:=1;
FOR innercounter IN 1 .. n LOOP
INSERT INTO emp1(id, col_a ,col_b,col_c ,col_d ,col_e, col_f ,col_g ,col_h ,col_i ,col_j ,col_k,col_l,col_m,col_n,col_o,col_p,
col_q,col_r,col_s,col_t,col_u,col_v,col_w,col_x,col_y,col_z,col_aa,col_bb,col_cc,col_dd,col_ee,col_ff,col_gg,
col_hh,col_ii,col_jj,col_kk,col_ll,col_mm,col_nn,col_oo,col_pp,col_qq,col_rr,col_ss,col_tt,col_uu,col_vv,col_ww,
col_xx) VALUES (id.nextval,'col_a','11-JAN-07','col_c','col_d','col_e','col_f','col_g','11-JAN-07' ,'col_i' ,'col_j',
'11-JAN-07','col_l','col_m','col_n','col_o','col_p','11-JAN-07','col_r','col_s','col_t','col_u','col_v','col_w',
'11-JAN-07','col_y','col_z','col_aaa','COL_BB','col_cc','col_dd','11-JAN-07','col_ff','col_gg','col_h','col_ii','col_jj',
'col_kk','11-JAN-07','col_mm','col_nn','col_o','col_pp','col_qq','col_rr','11-JAN-07','col_tt','col_uu',
'col_v','col_ww','col_xx');
cc:=cc+1;
if cc > 3 then
commit;
cc:=0;
end if;
END LOOP;
END;
/

Error in Z-Payroll function (No free numbers found for indexed perform)

Hi SAP-HR Experts .
I tried to write a Payroll Function by Pe04 .
When i saved it into PC40 Packege after that it gives me error that
Message no. P0712 , (" No free numbers found for indexed perform")
Please suggest me How to solve this .
Thanks & Regards : rajneesh

Hello Rajneesh,
Customer fuctions can not began with z as this is in the SAP namespace.
If you are using the customer namespace then please review SAP Note No. 1324745
Regards,
Manny

Oracle Text Indexing performance in Unicode database

Forum folks,
I'm looking for overall performance thoughts in Text Indexing within a Unicode database. Part of our internal testing suites includes searching on values using contains filters over indexed binary and text documents. We've architected these tests such that they could be run in a suite or on their own, thus, the data is loaded at the beginning of each test and then the text indexes are created and populated prior to running any of the actual testing.
We have the same tests running on non-unicode instances of Oracle 11gR2 just fine, but when we run them against a Unicode instance, we are almost always seeing timing issues where the indexes haven't finished populating, thus our tests are saying we've only found n number of hits when we are expecting n+ 50 or in some cases n + 150 records to be returned.
We are just looking for some general information in regards to text indexing performance in a unicode database. Will we need to add sleep time to the testing to allow for the indexes to populate? How much time? We would rather not get into having to create different tests for unicode vs non-unicode, but perhaps that is necessary.
Any insight you could provide would be most appreciated.
Thanks in advance,
Dan

Roger,
Thanks much for your quick reply...
When you talk about Unicode, do you mean AL32UTF8?
--> Yes, this is the Unicode charset we are using.
Is the data the same in both cases, or are you indexing simple 7-bit ascii data in the one database, and foreign text (maybe Chinese?) in the UTF8 database?
With the same data, there should be virtually no difference in performance due to the AL32UTF8 database character set.
--> We have a data generation tool we utilize. For non-unicode data, we generate using all 256 characters in the ISO-8859-1 set. With our Unicode data for clobs, we generate using only the first 1,000 characters of UTF8 by setting up an array of code points...0 - 1000. For Blobs, we have sets of sample word documents and pdfs that are inserted, then indexed.
I'm not sure I understand your testing methodology. Do you run ( load-data, index-data, run-queries ) sequentially?
--> That is correct. We utilize the ctx_ddl package to populate the pending table and then to sync the index....The following is an example of the ddl we generate to create and populate the index:
create index "DBMEARSPARK_ORA80"."RESRESUMEDOC" on "DBMEARSPARK_ORA80"."RESUME" ("RESUMEDOC") indextype is CTXSYS.CONTEXT parameters(' nopopulate sync (every "SYSTIMESTAMP + INTERVAL ''30'' MINUTE" PARALLEL 2) filter ctxsys.auto_filter ') PARALLEL 2;
execute ctx_ddl.populate_pending('"DBMEARSPARK_ORA80"."RESRESUMEDOC"',null);
execute ctx_ddl.sync_index('"DBMEARSPARK_ORA80"."RESRESUMEDOC"',null,null,2);
If so, there should be no way that the indexes can be half-created. If not, don't you have some check to see if the index creation has finished before running the query test?
--> Excellent question....is there such a check? I have not found a way to do that yet...
Were you just lucky with the "non-unicode" tests that the indexing just happened to have always finished by the time you ran the queries?
--> This is quite possible as well. If there is a check to see if the index is ready, then we could add that into our infrastructure.
--> Thanks, again, for responding so quickly.
Edited by: djulson on Feb 12, 2013 7:13 AM

Enq TM Contention vs Poor index performance

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