Oracle Apps Database severe Performance Issue

Hi Gurus,
This is regarding a severe performance issue running in our Production E-Business Suite Instance.
its an R12.1.3 setup installed with 11.2.0.1 Database. All the servers are Solaris Sparc 64 (Solaris 10)
Let me brief you about the instance first:
2 Node Application
- Main Application Server hosting web/forms/concurrent/admin servers
- iSupplier server hosting web services (placed in DMZ, used by external suppliers via Internet)
1 Node Database Server
Database Server Specs
Memory: 144G phys mem 20G total swap
- CPUs (8Px4cores, 2Px2cores)
- I/O - fiber channel hard disk (hitachi SAN Storage) - 7 DATA_TOPs (7 drives with RAID 5) - current DB size 1.6 TB
- at peak load, around 1000 concurrent forms session and 2000 web sessions.
We have been facing some serious performance issues and we raised an SR with Oracle Support.
The Support analyzed a bunch of AWR Reports we provided them and they asked us to increase the DB_CACHE from its current usage of 27G to 40G
So, we changed SGA_TARGET from 35G to 50G and PGA was increased from 35G to 40G as v$pgastat was also suggesting some lack of memory.
We made these changes last night.
Today morning we observed the following:
1. after start of office hours, we checked in the home page of EM DB Console that ADDM was showing reduced impact due to lack of SGA memory which seemed to be a good sign. Earlier it was around 25% which was now at 12%.
However, negative aspects were:
1. lot of swapping was reported by the System Administrators on the DB Server
2. High CPU Usage
3. EM DB Console showed a lot of "Concurrency Wait Class" events ...throughout the day lot of blocking sessions were reported which were making other sessions to wait.
in the AWR Report, following foreground reports were listed:
Top 5 Timed Foreground Events
Event
Waits
Time(s)
Avg wait (ms)
% DB time
Wait Class
DB CPU
132,577
61.46
library cache lock
3,539
40,683
11496
18.86
Concurrency
library cache: mutex X
4,014,083
21,011
5
9.74
Concurrency
db file sequential read
4,138,014
20,767
5
9.63
User I/O
latch free
381,916
5,897
15
2.73
Other
This is showing "library cache lock" events as the main culprit apart from the usual suspect, the CPU.
I am attaching the AWR Report. Please let me know if i should revert back the memory changes or is there anything else i could do.
Please help us resolving it because the performance is going worst.
Regards,
Muneer.

Pl do not post duplicates - Oracle Apps Database severe Performance Issue
For all critical production issues, pl work with Support thru SRs - using the forums to troubleshoot production issues is not wise

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user12094010 wrote:
Hello,
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Hai everybody,
In oracle 11g 11.2.0.1.0 we are developing business application using java, Our developers said Database performance is very poor it takes more time to retrieve values from database, they check froantend and middleware that has no problem, if the query returns less values or rows it takes little more time. How can i solve this problem? please help me
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hai,
sorry for the delay my @$ORACLE_HOME/rdbms/admin/ashrpt.sql output shown below
ASH Report For ORCL/orcl
DB Name DB Id Instance Inst Num Release RAC Host
ORCL 1295420332 orcl 1 11.2.0.1.0 NO node6.node6-
CPUs SGA Size Buffer Cache Shared Pool ASH Buffer Size
2 1,561M (100%) 480M (30.7%) 432M (27.7%) 4.0M (0.3%)
Analysis Begin Time: 04-Oct-12 16:44:16
Analysis End Time: 04-Oct-12 16:59:33
Elapsed Time: 15.3 (mins)
Begin Data Source: V$ACTIVE_SESSION_HISTORY
End Data Source: V$ACTIVE_SESSION_HISTORY
Sample Count: 3
Average Active Sessions: 0.00
Avg. Active Session per CPU: 0.00
Report Target: None specified
Top User Events DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
Avg Active
Event Event Class % Event Sessions
null event Other 33.33 0.00
Top Background Events DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
Avg Active
Event Event Class % Activity Sessions
CPU + Wait for CPU CPU 33.33 0.00
os thread startup Concurrency 33.33 0.00
Top Event P1/P2/P3 Values DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Service/Module DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
Service Module % Activity Action % Action
SYS$BACKGROUND UNNAMED 66.67 UNNAMED 66.67
SYS$USERS UNNAMED 33.33 UNNAMED 33.33
Top Client IDs DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top SQL Command Types DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Phases of Execution DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
Avg Active
Phase of Execution % Activity Sessions
SQL Execution 33.33 0.00
Top SQL with Top Events DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top SQL with Top Row Sources DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top SQL using literals DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Parsing Module/Action DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top PL/SQL Procedures DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Java Workload DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Call Types DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Sessions DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
-> '# Samples Active' shows the number of ASH samples in which the session
was found waiting for that particular event. The percentage shown
in this column is calculated with respect to wall clock time
and not total database activity.
-> 'XIDs' shows the number of distinct transaction IDs sampled in ASH
when the session was waiting for that particular event
-> For sessions running Parallel Queries, this section will NOT aggregate
the PQ slave activity into the session issuing the PQ. Refer to
the 'Top Sessions running PQs' section for such statistics.
Sid, Serial# % Activity Event % Event
User Program # Samples Active XIDs
10, 1 33.33 CPU + Wait for CPU 33.33
SYS [email protected] (ARC2) 1/917 [ 0%] 0
19, 148 33.33 null event 33.33
SYS [email protected] (J000) 1/917 [ 0%] 0
139, 3 33.33 os thread startup 33.33
SYS [email protected] (CJQ0) 1/917 [ 0%] 0
Top Blocking Sessions DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Sessions running PQs DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top DB Objects DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top DB Files DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Top Latches DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
No data exists for this section of the report.
Activity Over Time DB/Inst: ORCL/orcl (Oct 04 16:44 to 16:59)
-> Analysis period is divided into smaller time slots
-> Top 3 events are reported in each of those slots
-> 'Slot Count' shows the number of ASH samples in that slot
-> 'Event Count' shows the number of ASH samples waiting for
that event in that slot
-> '% Event' is 'Event Count' over all ASH samples in the analysis period
Slot Event
Slot Time (Duration) Count Event Count % Event
16:48:00 (2.0 min) 1 CPU + Wait for CPU 1 33.33
16:50:00 (2.0 min) 2 null event 1 33.33
os thread startup 1 33.33
End of Report
Regards Benk

How to resolve most of the Oracle SQL , PL/SQL Performance issues with help of quick Checklist/guidelines ?

Please go thru below important checklist/guidelines to identify issue in any Perforamnce issue and resolution in no time.
Checklist for Quick Performance problem Resolution
·         get trace, code and other information for given PE case
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·         Check all mandatory parameters/bind variables are directly mapped to index columns of large transaction tables without any functions
·         Identify most time consuming operation(s) using Row Source Operation section
·         Study program parameter input directly mapped to SQL
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1) Use Bulk Processing feature BULK COLLECT with LIMIT and FOR ALL for DML instead of row by row processing
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8) Follow Oracle PL/SQL Best Practices
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10) Avoid costly Full Table Scan on Big Transaction tables with Huge data volume,
11) Use appropriate filtration condition on index columns of seeded Oracle tables directly mapped to program parameters
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Thanks
Praful

I understand you were trying to post something helpful to people, but sorry, this list is appalling.
1) Use Bulk Processing feature BULK COLLECT with LIMIT and FOR ALL for DML instead of row by row processing
No, use pure SQL.
2) Use Data Caching Technique/Options to cache static data
No, use pure SQL, and the database and operating system will handle caching.
3) Use Pipe Line Table Functions whenever possible
No, use pure SQL
4) Use Global Temporary Table, Materialized view to process complex records
No, use pure SQL
5) Try avoiding multiple network trips for every row between two database using dblink, Use Global temporary table or set operator to reduce network trip
No, use pure SQL
6) Use EXTERNAL Table to build interface rather then creating custom table and program to Load and validate the data
Makes no sense.
7) Understand Oracle's Cost based Optimizer and Tune most expensive SQL queries with help of Explain plan
What about using the execution trace?
8) Follow Oracle PL/SQL Best Practices
Which are?
9) Review tables and their indexes being used in the SQL queries and avoid unnecessary Table scanning
You mean design your database and queries properly? And table scanning is not always bad.
10) Avoid costly Full Table Scan on Big Transaction tables with Huge data volume,
It depends if that is necessary or not.
11) Use appropriate filtration condition on index columns of seeded Oracle tables directly mapped to program parameters
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12) Review Join condition on existing query explain plan
Well, if you don't have your join conditions right then your query won't work, so that's obvious.
13) Use Oracle hint to guide Oracle Cost based optimizer to choose best plan for your custom queries
No. Oracle recommends you do not use hints for query optimization (it says so in the documentation). Only certain hints such as APPEND etc. which are more related to certain operations such as inserting data etc. are acceptable in general. Oracle recommends you use the query optimization tools to help optimize your queries rather than use hints.
14) Avoid applying SQL functions on index columns
Why? If there's a need for a function based index, then it should be used.
15) Use appropriate hint to guide Oracle CBO to choose best plan to reduce response time
See 13.
In short, there are no silver bullets for dealing with performance. Each situation is different and needs to be evaluated on its own merits.

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DATA_LENGTH,
DATA_PRECISION,
DATA_SCALE,
NULLABLE
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If you also want to compare indexes, triggers, etc then do the same sort of thing for the associated dba_ views for those objects.
And if you want to compare table contents, then often the fastest way is also to check minuses in both directions, if the tables are not too big:
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(select * from schema1.table@dblink1
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select * from schema2.table@dblink2)
union all
(select * from schema2.table@dblink2
minus
select * from schema1.table@dblink1)
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There are tools to help in such things. TOAD, for example, has a pretty good schema comparison tool, and there are plenty of other options out there. But if you need to script this yourself then the logic I've shown is a good starting point.
Cheers,
Mike

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Enter the following SQL*Plus commands:
SQL> STARTUP MIGRATE
SQL> SPOOL patch.log
SQL> @ORACLE_BASE\ORACLE_HOME\rdbms\admin\catpatch.sql
SQL> SPOOL OFF
(Please note that this is my first experience with working with Dataguard, so my methods in updating might have been a bit off-base.)
If I attempt to startup the standby database in MIGRADE mode, I get the following error (which is expected):
ORA-01666: controlfile is for a standby database
If I try to run the catpatch.sql script, even after mounting the database in standby mode, I receive the additional error:
ORA-01219: database not open: queries allowed on fixed tables/views only
My question here is, how do I get the standby database to allow me to finish the software upgrade process, so that both versions of Oracle match on the primary and standby databases? :)
(I did try some research on Metalink, but only found an article detailing how to upgrade your dataguard database from 9i to 10g, which did not look especially helpful in this case...)
Thank you!
-Sabrina

Depending on the kind of Dataguard you currently have, physical or logical, there are two useful metalinks notes:
Upgrading to 10g with a Physical Standby in Place
Doc ID: Note:278521.1
Upgrading to 10g with a Logical Standby in Place
Doc ID: Note:278108.1
~ Madrid
http://hrivera99.blogspot.com/

BW database related performance issue..

hi...
can anyone tell me how to improve the database performance??

Hi Nisha,
Welcome to SDN )
The Database performance increases by doing the following,
1. Partioning
2. Indexing
3. Archive unwanted data
4. Creating Aggregates ( Consider DB ratio and KPI ratio)
5. Check for parallelization options
6. deleting PSA requests
Please the below links
check this
http://help.sap.com/bp_biv235/BI_EN/documentation/Multi-dimensional_modeling_EN.doc
and
Business Intelligence Performance Tuning [original link is broken]
Thanks,
Sudhakar.
Saying thanks in SDN == Assigning Points.

Oracle Apps Database severe Performance Issue

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