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Don Burleson Blog 







Oracle SQL profile Tips

Expert Oracle Database Tips by Donald BurlesonJanuary 7, 2015

Question: I understand that SQL profiles are used to lock down execution plans, but I don't understand how SQL profiles are used to tune SQL.  What are the features of SQL profiles and when are SQL profiles used?

Answer:  A SQL Profile is a bundle of improved optimizer statistics that is stored in the data dictionary.  SQL Profiles are create by running Automatic SQL Tuning.

Deploying SQL profiles can behave like optimizer plan stability to allow you to "swap" a bad execution  plan with a good execution plan!  SQL profiles allow you to tune vendor SQL without ever touching the application because SQL profiles intercept the SQL as it enters the library cache.

Just like stored outlines in the past, SQL profiles can be exported and imported.  Tips on migrating SQL profiles are available HERE.

SQL optimization is a complex subject, and SQL profiles are proving to be a key element in achieving a higher level of database optimization than was available in early versions of Oracle due to the limited ability of the DBA to impact the performance of poor application code.

An integral part of the SQL Tuning Advisor (STA), the SQL Profile is a collection of the historical information of prior runs of the SQL statement, comparison details of the actual and estimated cardinality, and predicate selectivity, etc. SQL Profile is stored persistently in the data dictionary, so it does not require any application code changes. 

SQL Profiles are one part the exciting Automatic SQL Tuning feature rolled out with version 11g.  This feature can automatically generate and implement SQL improvments at the discretion of the administrator.

Moving forward, SQL Plan Management will be key to locking down the SQL execution plans needed for optimal performance.

Additional information on SQL Profiles is available HERE.

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