| explain plan and autotrace [message #342261] |
Thu, 21 August 2008 16:57  |
ora1980
Messages: 251
Registered: May 2008
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Senior Member |
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while explain plan gives the query plan, and gives information
whether out sql is in shared pool,
autotrace also gives the query plan and statistics
so whats the difference? and which one is better to use?
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| Re: explain plan and autotrace [message #342757 is a reply to message #342287] |
Sun, 24 August 2008 21:49  |
rleishman
Messages: 3728
Registered: October 2005
Location: Melbourne, Australia
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Senior Member |
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| Michel Cadot wrote on Fri, 22 August 2008 14:16 | autotrace gives actual statistics
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Are you certain? The autotrace statistics section contains actuals, but I suspect the explain plan cardinality/bytes etc contains estimates. Haven't verified this - just from observation.
Ross Leishman
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| Re: explain plan and autotrace [message #342775 is a reply to message #342757] |
Mon, 25 August 2008 01:18 |
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Michel Cadot
Messages: 68716
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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What I meant is the "statistics" part of autotrace, not the statistics in "execution plan" part of it, are real ones.
Actually when you execute "set autotrace on", SQL*Plus starts a new session that gathers statistics of the previous (and executing) one from v$sessstat.
Regards
Michel
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