Could someone tell me how I can I spend the sql_id/plan_hash_value and corresponding implementation plans?
Hi experts,
I want to know, how to get the past (like a week older) sql_id/plan_jash_values and corresponding implementation plans.
I am aware that v$ session contains these last sql_id/hash_value, distinguished by a sql statement that is executed and we can get the plan_hash_value from v$ sql using the following query.
Select sql_id, hash_value, plan_hash_value from v$ sql where sql_id = & sql_id;
Once you leave this session, session $ v clears the session information, subsequently sql_id will be also deleted.
I want to know,
1 how long v$ sql holds the plan_hash_value, is there a retention period?
2. when we issue ' select * table ((dbms_xplan.display_cursor ('& sql_id')) ", when the execution plan is read since?").
3. I need to compare the implementation plans for a perticular query last week one, what are my options?
Please help me with my questions, experts.
Kind regards
Ravi K
Yes, the AWR repository is accessible by SQL queries on the DBA_HIST views. (these are the same!)
Thus, the AWR retention period applies to data in views DBA_HIST.
A SQL query that is not reported by a snapshot of the CWA would not be in the views DBA_HIST.
Hemant K Collette
Tags: Database
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