Re: Optimizer help, get query to run as good as with RULE hint

I prefer the analogy of asking if Einstein theory of general relativity was correct before the technology was available to prove it correct ;)

Two serious points though:
I didn't say "untraceable" I said 'a lot harder to decide why'.

Secondly - if you start with the premise that hints are ignorable, this means you may give up much too soon when trying to use a hint and do something nasty like turning a SQL statement into a great long screed of procedural code. Not that I approve of hints, mind you - but sometimes hinting is the least-worst short-term solution.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 17 February 2003 03:34
hint

>Sounds more and more like a "if a tree falls in the
>forest and no-one is there" kind of discussion..
>
>We're getting to the stage where there is an
>indeterminate number of untraceable but deliberate
>reasons for the optimizer to 'avoid' a hint. Without
>access to the source code, that's getting pretty close
>to the statement: "the optimizer ignored my hint"
>
>:-)
>

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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