SQLT profile SQL "Glue" not how don't eliminate the inefficient Plan hash value?
I have a strange problem. I have used many times before SQLT not only assign a SQL profile for a specific query, but also for the force_match of other issues with different literal values. It has always worked in the past. I run the following script:
START coe_xfr_sql_profile.sql <sql_id> <plan_hash_value>
I take the generated script and modify the following (line #9) to force the game.
DBMS_SQLTUNE.IMPORT_SQL_PROFILE ( sql_text => sql_txt, profile => h, name => 'some_name', description => 'some description'||:signature||' '||:signaturef||'', category => 'DEFAULT', validate => TRUE, replace => TRUE, force_match => TRUE /* TRUE:FORCE (match even when different literals in SQL). FALSE:EXACT (similar to CURSOR_SHARING) */ ); DBMS_LOB.FREETEMPORARY(sql_txt); END; /
When I run the script, I can see the profile is assigned to the specified SQL_ID, but not for those with a different literal values (example: LIKE "< some_value >"). I know that we should use bind variables here and that will be recommended for the developer. The difference between the two plans, however, is huge (+ 30 minutes instead of milliseconds) and the impact on our production database is very noticeable when multiple users are doing the same. When I take a look at the different SQL_ID, they all use the exact same ineffective regime. Since I can't make the SQL profile on all of the SQL_ID, is there a way to eliminate the inefficient system of restraint? I used forced for several times and this is the first time, it didn't work. Help is greatly appreciated. Thank you.
Have you checked the FORCE_MATCH_SIGNATURE of the SQL statements in question in V$ SQL?
If they are not all the same, the FORCE_MATCH cannot help.
Why they may not have the same thing?
For example, if they use links AND literals.
E.g. literals only:
set serveroutput on declare l_sig NUMBER; begin l_sig := dbms_sqltune.sqltext_to_signature('select * from t1 where col1 = 1',TRUE); dbms_output.put_line(l_sig); end; / anonymous block completed 109606082837927916 declare l_sig NUMBER; begin l_sig := dbms_sqltune.sqltext_to_signature('select * from t1 where col1 = 2',TRUE); dbms_output.put_line(l_sig); end; / anonymous block completed 109606082837927916
But if you use bind AND literals:
declare l_sig NUMBER; begin l_sig := dbms_sqltune.sqltext_to_signature('select * from t1 where col1 = 1 and col2 = :1',TRUE); dbms_output.put_line(l_sig); end; / anonymous block completed 16455499341945681140 declare l_sig NUMBER; begin l_sig := dbms_sqltune.sqltext_to_signature('select * from t1 where col1 = 2 and col2 = :1',TRUE); dbms_output.put_line(l_sig); end; / anonymous block completed 13278767079226598822
Unfortunately...
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