How to force a sql_id to use a specific hash plan value

Question

Hi,
in my 11.2 database i've seen that a sql_id change hash plan value.
The original was more faster than second, but optimizer use second.
How can i force the sql_id to use the first hash plan value?
Tnx

Answer 1

Hi,
i've a problem.
I've fixed the plan 3 days ago, but looking AWR (today), it use old hash plan.
Plan Hash           Total Elapsed                 1st Capture   Last Capture
#   Value                    Time(ms)    Executions       Snap ID        Snap ID
1   2658787094              3,592,228             0           334            334looking into dba_sql_plan_baselines i've 2 plan_name, and only one is fixed.
select *
from table(dbms_xplan.display_sql_plan_baseline(sql_handle => 'SQL_3d5572d6f5e8cdda', format => 'basic'));
Plan name: SQL_PLAN_3upbkuvuyjmfub082c0c4         Plan id: 2961359044
Enabled: YES     Fixed: NO      Accepted: YES     Origin: MANUAL-LOAD
Plan hash value: 2658787094
Plan name: SQL_PLAN_3upbkuvuyjmfu7ca80389         Plan id: 2091385737
Enabled: YES     Fixed: YES     Accepted: YES     Origin: MANUAL-LOAD
Plan hash value: 3534976400
id plan hash  last seen            elapsed (s)  origin          note                                                                                                                                 
   1 3534976400  2012-10-26/14:00:11      183.232 AWR             not reproducible                                                                                                                     
   2 2658787094  2012-10-29/12:00:24    23116.872 AWR             not reproducible Why i see old plan (2658787094)?
Thanks