Home » RDBMS Server » Performance Tuning » Question on Object Statistics and Query Execution (RDBMS, 9.2.0.6, Solaris 2.8)
Question on Object Statistics and Query Execution [message #325305] Thu, 05 June 2008 12:08 Go to next message
bnienhau
Messages: 4
Registered: June 2008
Junior Member
What effect does changing the statistics (updating, generating, removing, etc.) of tables/indexes have on an already executed query that is using the aforementioned tables/indexes whose statistics have "changed"? In short, once the execution of the query has started, does changing the statistics of said query's objects (tables/indexes) while it's still in execution mode have any effect on the execution time, or only on any subsequent executions of the query?

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Re: Question on Object Statistics and Query Execution [message #325307 is a reply to message #325305] Thu, 05 June 2008 12:13 Go to previous messageGo to next message
BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal
Senior Member
>does changing the statistics of said query's objects (tables/indexes) while it's still in execution mode have any effect on the execution time,
No
>or only on any subsequent executions of the query?
yes

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Re: Question on Object Statistics and Query Execution [message #325310 is a reply to message #325307] Thu, 05 June 2008 12:24 Go to previous message
bnienhau
Messages: 4
Registered: June 2008
Junior Member
Thanks.

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