Re: Poor Oracle performance? getting rid of bind variables
Re: Poor Oracle performance? getting rid of bind variables
- Subject: Re: Poor Oracle performance? getting rid of bind variables
- From: Ken Anderson <email@hidden>
- Date: Tue, 21 Aug 2007 14:11:14 -0400
Art,
Seems like other people have similar problems with bind variables:
http://www.thescripts.com/forum/thread65559.html
According to this guy, the optimizer punts when bind variables are
used and uses a table scan! Now, more than anything, I really need
to figure out how to stop EOF from using bind variables.
Any thoughts?
Thanks,
Ken
On May 16, 2007, at 4:04 PM, Art Isbell wrote:
On May 16, 2007, at 9:33 AM, Gavin Eadie wrote:
I concur, with Oracle and OpenBase - that setting has no effect
(and its default is false anyway) .. Gav
I see that JDBCExpression overrides EOSQLExpression's
useBindVariables() to always return true. And
OraclePlugIn.OracleExpression, a JDBCExpression subclass, doesn't
override useBindVariables(), so the Oracle plugin must be set to
use bind variables regardless of the value of
EOAdaptorUseBindVariables.
That said, I'd be surprised that merely using bind variables would
cause the poor fetch performance. In fact, I thought that bind
variable usage was supposed to help the query optimizer improve
performance, but my memory might be faulty.
Aloha,
Art
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