No, I hven't! Thanks for the tip. I will try it, though between
well documented hints and undocumented parameters I always tend to
chose well documented and supported option.
On 2003.05.14 21:56 K Gopalakrishnan wrote:
> Mladen,
>
> Have you ever tried
> _like_with_bind_as_equavlity=TRUE,
>
> This parameter is introduced only to fix like your kind of
> problems.
>
>
> KG
>
> >The contention issue are the bind variables from PRO*C programs where
> >things "LIKE :S" are usually resolved by using a full table scan,
> >even if :S is of the form 'ABC%' in which case the query should, as
> >we all know, use an index. The only solution that I have for the
> problem
> >is to put a dreaded hint in the select.
>
> Best Regards,
> K Gopalakrishnan
>
>
>
>
> -----Original Message-----
> Gogala
> Sent: Wednesday, May 14, 2003 5:12 PM
> To: Multiple recipients of list ORACLE-L
>
>
> So, if hints are such a big no-no, what other methods are there at our
> disposal
> for tuning queries? Trust the optimizer? With all due respect, CBO
> didn't
> yet fully deserve my trust. I've even experimented with
>
> optimizer_index_caching and optimizer_index_cost_adj
>
> with good results. Those two parameters are crucial in making
> CBO behave more like RBO and use an index when it's there (the mantra
> of the RBO).
>
> The contention issue are the bind variables from PRO*C programs where
> things "LIKE :S" are usually resolved by using a full table scan,
> even if :S is of the form 'ABC%' in which case the query should, as
> we all know, use an index. The only solution that I have for the
> problem
> is to put a dreaded hint in the select.
>
> I believe that those "hints are bad" statements are a part of oracle
> marketing
> of "smart database which doesn't need a DBA". One thing that Tom
> doesn't
> explain in his article is exactly what does he do to tune an
> application?
> The phrase was "we find an underlying problem and fix it". How
> exactly?
> By developing a kernel patch? Are we about to see some form of
> "develop
> your
> own RDBMS kernel patch" utility? The first version of such utility was
> called "external procedures".
> In other words, Oracle is being squeezed by M$ and they're trying to
> develop
> an image of a database which doesn't need tuning and expensive
> specialists to
> operate. Tom, being a politically correct employee of the Oracle
> Corp.,
> is
> wholeheartedly promoting that image. Unless they give me an optimizer
> which
> will have 100% predicable outcome when I'm writing the query, I'll use
> the
> tuning tools. Oracle has done a lot of quick and dirty things to
> emulate
> the behavior of SQL Server, one of which are global temporary tables.
> To
> add insult to injury, the quality of their code is more and more like
> M$.
>
>
>
>
>
> On 2003.05.14 16:21 Stephane Paquette wrote:
> > Hi,
> >
> > Some weeks ago, I post a question on the future of hints.
> > Today, as I was browsing on asktom, I found this :
> >
> > In Oracle Applications development (11i apps - HR, CRM, etc) Hints
> are
> > strictly
> > forbidden. We find the underlying cause and fix it.
> >
> > The link is
> >
> :http://asktom.oracle.com/pls/ask/f?p=4950:8:169648911033790652::NO::F4950_P
> > 8_DISPLAYID,F4950_P8_CRITERIA:7038986332061,
> >
> >
> >
> > Stephane Paquette
> > Administrateur de bases de donnees
> > Database Administrator
> > Standard Life
> > www.standardlife.ca
> > Tel. (514) 925-7187
> > stephane.paquette_at_standardlife.ca
> > <mailto:stephane.paquette_at_standardlife.ca>
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Stephane Paquette
> > INET: stephane.paquette_at_standardlife.ca
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > San Diego, California -- Mailing list and web hosting
> services
> >
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>
> --
> Mladen Gogala
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Mladen Gogala
> INET: mgogala_at_adelphia.net
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: K Gopalakrishnan
> INET: kaygopal_at_yahoo.com
>
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--
Mladen Gogala
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Mladen Gogala
INET: mgogala_at_adelphia.net
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Received on Wed May 14 2003 - 21:36:41 CDT
