Issue in evolving sql id from sqlset

Question

Hi ,
We have upgraded database from 10.2.0.5 to 11.2.0.3.
Before Upgrade we create STS for all our sql statmenet .
Now we are facing performance issue in one query and this sql_id in STS so how i can evolve particular statement in SPM from STS?
I Know that i can evolve using below procedure but how i can find sql_handle of my sql_id ?
my sql_id is gz6am600xuyhu
Set serveroutput on
set long 100000
Declare
Output_report clob;
begin
output_report:=dbms_spm.evolve_sql_plan_baseline(
sql_handle=><>);
dbms_output.put_line(output_report);
end;
Regards
Gaurav

Answer 1

To evolve a sql plan baseline, you first have to have a baseline.
Did you load your statements from the STS into a baseline?
The API for that is DBMS_SPM.LOAD_PLANS_FROM_SQLSET.
Baseline evolution involves taking the plans in a baseline that have been captured for a particular statement (captured at hard parse time and not necessarily used depending on your baseline settings) and evaluating them to see if any actually deliver improved performance.
Look in DBA_SQL_PLAN_BASELINES to see the baselines that have been captured for a particular SQL_HANDLE. SQL statments in V$SQL and DBA_HIST_SQLSTAT map to a baseline via the EXACT_MATCHING_SIGNATURE. (although SQL_HANDLE is actually also a representation of the signature)
Is this what you want?
From your description, I'm not sure that it is.
With your STS in a baseline, it might be that actually what you're best doing is running the SQL Tuning Advisor on that tuning set, a subset of that tuning set or one particular statement in that tuning set.
The output of the SQL Tuning Advisor is nearly always a profile - which is fine if you're happy with that - and if you accept the profile that should result in the plan that that profile creates being baselined.