Comments on: Oracle 11g SQL Plan Management - SQL Plan Baselines http://kerryosborne.oracle-guy.com/2009/04/oracle-11g-sql-plan-management-sql-plan-baselines/ Just another Oracle blog Sat, 13 Mar 2010 15:26:53 +0000 http://wordpress.org/?v=2.6.3 By: osborne http://kerryosborne.oracle-guy.com/2009/04/oracle-11g-sql-plan-management-sql-plan-baselines/#comment-5644 osborne Fri, 13 Nov 2009 14:31:41 +0000 http://kerryosborne.oracle-guy.com/?p=1265#comment-5644 Kyle, Thanks for the kind words. Interesting question. I had an online dialog with a guy name Randolf Geist a year ago or so where he convinced me to look closer at SQL Profiles. Up until that point I had only seen SQL Profiles that were created by the SQL Tuning Advisor and I was not very impressed. They tended to go sour after a little time because of the OPT_ESTIMATE hint, but I digress. The answer is yes, I think SQL Profiles have a couple of advantages over Outlines at this point. 1. They have the ability to be used on multiple statements (ones that are the same except for literals) using the force matching signature bit. 2. They are newer. I'm starting to worry about Outlines getting buggy due to lack of attention. Documentation says they are deprecated and although they continue to work in 11g, I am a bit leery of continuing to use them at this point. (the whole hint based mechanism is tricky enough as it is). 11gR2 includes a procedure to migrate Outlines to Baselines by the way (DBMS_SPM.MIGRATE_STORED_OUTLINE). At any rate, I am not implementing Outlines at this point. Kerry Kyle,

Thanks for the kind words. Interesting question. I had an online dialog with a guy name Randolf Geist a year ago or so where he convinced me to look closer at SQL Profiles. Up until that point I had only seen SQL Profiles that were created by the SQL Tuning Advisor and I was not very impressed. They tended to go sour after a little time because of the OPT_ESTIMATE hint, but I digress. The answer is yes, I think SQL Profiles have a couple of advantages over Outlines at this point.

1. They have the ability to be used on multiple statements (ones that are the same except for literals) using the force matching signature bit.

2. They are newer. I’m starting to worry about Outlines getting buggy due to lack of attention. Documentation says they are deprecated and although they continue to work in 11g, I am a bit leery of continuing to use them at this point. (the whole hint based mechanism is tricky enough as it is).

11gR2 includes a procedure to migrate Outlines to Baselines by the way (DBMS_SPM.MIGRATE_STORED_OUTLINE). At any rate, I am not implementing Outlines at this point.

Kerry

]]> By: Kyle Hailey http://kerryosborne.oracle-guy.com/2009/04/oracle-11g-sql-plan-management-sql-plan-baselines/#comment-5637 Kyle Hailey Fri, 13 Nov 2009 02:51:03 +0000 http://kerryosborne.oracle-guy.com/?p=1265#comment-5637 awesome write-ups. I much enjoyed them because it was on my list of tasks to look at using the old outline swap to use hints on a statement for profiles and baselines. Baselines seem like a solid solution for most statements when hints are beneficial because of the evolve option. Curious if there is any reason you see to use profiles over outlines. awesome write-ups.
I much enjoyed them because it was on my list of tasks to look at using the old outline swap to use hints on a statement for profiles and baselines. Baselines seem like a solid solution for most statements when hints are beneficial because of the evolve option.
Curious if there is any reason you see to use profiles over outlines.

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