How to pin sequences in the shared pool for RAC?

We have a RAC environment with two instances. I want to pin some sequences in the shared pool to boost the performance. Do I need to pin them in both of the instances or just pin them in one instance?
Thanks in advance

If you cannot tolerate gaps, you must not use sequences. Period. A sequence-generated key will have gaps because transactions roll back, because databases get shut down, etc. If you want to ensure that there are no gaps, you have to write code that serializes access to a resource (i.e. a custom table of sequences) over the full length of a transaction. Of course, this is hugely inefficient and kills the application's scalability, but it does prevent gaps. Sequences are much faster and much more scalable, but they do not and can not guarantee that there are no gaps.
Assuming the intention is to minimize gaps, rather than to eliminate them, NOCACHE & ORDER can help. That means, though, that you may need to communicate with the other nodes in the cluster every time you need a new value from the sequence, which is the slow part. Pinning the sequence is not going to be beneficial.
Justin

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Pinning is in the Shared Pool in the SGA. So it is local to an instance.
Therefore, you would need to execute it in each instance (i.e. on each node).
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mohammed_dba wrote:
hi dear,
please tell me how can find out which package is frequently pins? please give query for thatI guess you mean which packages are frequently accessed and are candidate for the pinning in the keep pool.
Use the following query:
SELECT substr(owner,1,10)||'.'||substr(name,1,35) "Object Name",
' Type: '||substr(type,1,12)||
' size: '||sharable_mem ||
' execs: '||executions||
' loads: '||loads||
' Kept: '||kept
FROM v$db_object_cache
WHERE type in ('TRIGGER','PROCEDURE','PACKAGE BODY','PACKAGE')
AND executions > 0
ORDER BY executions desc,
loads desc,
sharable_mem desc;Then check which objects have high value for the EXECS column. Also consult with your application developers to identify the frequently used code.
regards

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ADDM Report for Task 'ADDM:1775307360_12808'
Analysis Period
AWR snapshot range from 12807 to 12808.
Time period starts at 10-MAY-11 01.00.15 PM
Time period ends at 10-MAY-11 02.00.23 PM
Analysis Target
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Database version 11.1.0.7.0.
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Activity During the Analysis Period
Total database time was 27827 seconds.
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Description Active Sessions Recommendations
Percent of Activity
1 Shared Pool Latches 6.43 | 83.42 0
2 Top SQL by DB Time 2.41 | 31.24 3
3 "Concurrency" Wait Class 2.18 | 28.22 0
4 PL/SQL Execution 1.53 | 19.86 1
5 "User I/O" wait Class 1.33 | 17.24 0
6 Hard Parse 1.24 | 16.14 0
7 Undersized Buffer Cache .83 | 10.73 0
8 CPU Usage .7 | 9.02 0
9 Top SQL By I/O .31 | 4.04 1
10 Top Segments by I/O .24 | 3.12 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Findings and Recommendations
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Impact is 6.43 active sessions, 83.42% of total activity.
Contention for latches related to the shared pool was consuming significant
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Instances that were significantly affected by this finding:
Number Name Percent Impact ADDM Task Name
1 ADVFDWP1 99.31 ADDM:1775307360_1_12808
Check the ADDM analysis of affected instances for recommendations.
Finding 2: Top SQL by DB Time
Impact is 2.41 active sessions, 31.24% of total activity.
SQL statements consuming significant database time were found.
Recommendation 1: SQL Tuning
Estimated benefit is 1.07 active sessions, 13.82% of total activity.
Action
Run SQL Tuning Advisor on the SQL statement with SQL_ID "fdk73nhpt93a5".
Related Object
SQL statement with SQL_ID fdk73nhpt93a5.
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begin
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a12
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select pool,sum(bytes)/1024/1024/1024 from v$sgastat group by pool;
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Receiving the 404 on box. Since the Oracle 404 error is
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ORA-04031 error can be due to either an inadequeate sizing of the SHARED POOL size or due to heavy
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Title: Diagnosing and Resolving Error ORA-04031
2.Article-ID: Note 62143.1
Title: Understanding and Tuning the Shared Pool
3.Article-ID: Note 61623.1
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How to pin sequences in the shared pool for RAC?

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