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Re: immediate value vs bind variable

From: Oracle User <spamspamspam_at_spamworld.com>
Date: Tue, 16 Jul 2002 23:33:52 +0100
Message-ID: <kb1Z8.261$AR4.8274@newsfep3-gui.server.ntli.net>


"Brain the size of a planet, and they ask me if I can cook pancakes."

"Sybrand Bakker" <postbus_at_sybrandb.demon.nl> wrote in message news:uj93nqhhlo9t5c_at_corp.supernews.com...
>
> "Syltrem" <syltremspammenot_at_videotron.com> wrote in message
> news:IY%Y8.6315$H67.33359_at_tor-nn1.netcom.ca...
> > Hi
> >
> > I don't know where to start looking in the doc to find the answer /
> solution
> > to this:
> >
> > a WHERE TABLE_COLUMN > bind_variable
> > takes significantly longer than a
> > WHERE TABLE_COLUMN > 'immediate value'
> >
> > The TABLE_COLUMN is a CHAR(2)
> >
> > Whether I declare the bind variable as a char or varchar don't make a
> > difference, it's always longer when using the bind variable. Exapmle:
0.23
> > seconds (immediate value) compared to 7.67 seconds (bind variable).
> >
> > Suggestions please!
> >
> > Thanks
> > --
> >
> > Syltrem
> > http://pages.infinit.net/syltrem (OpenVMS related web site - en
franšais)
> > To reply to myself directly, remove .spammenot from my address
> >
> >
> >
>
> Posting a version is asked too much I guess.
> Details about this issue can be found in 'Designing Oracle for
Performance'
> aka the performance tuning manual, and in numerous posts in the google
> archives that no one cares to search.
>
> The issue is the CBO (until I believe 8.1.7 EE) can't 'look' into bind
> variables and hence can't check the content of the bind variable against
> histograms present. Of course if you never did create histograms, it
> wouldn't make any difference.
>
> Hth
>
>
> --
> Sybrand Bakker
> Senior Oracle DBA
>
> to reply remove '-verwijderdit' from my e-mail address
>
>
>
Received on Tue Jul 16 2002 - 17:33:52 CDT

Original text of this message

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