RE: ((Re)): Really Wierd Query tuning issue
- From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 13 Aug 2004 14:53:34 +0200
just to add my two cents, an additional reason why SQL*Plus AUTOTRACE is
sometimes less reliable than EXPLAIN PLAN is the fact that AUTOTRACE uses a
second (separate) session for statistics collection.
Kind regards,
Lex.
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visit http://www.naturaljoin.nl
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-----Original Message-----
10046 trace (also KST trace) is the ultimate source for information, since
it is a trace - the actual operations are logged instead of simulated or
replayed in possibly different environment like with explain plan and
autotrace (yes, autotrace uses explain plan)
So, trust 10046 and forget about explain plan, this is mostly for
development & experimental environments...
Tanel.
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