RE: long runtimes cured by cutting hash_area_size by 90% - ???

You specifically mentioned Oracle 8 (inclusive of 8i I assume?). Does your mention of 8 imply that 9i does a better job of exercising "damage limitation"?

Regards,

Larry G. Elkins
elkinsl_at_flash.net
214.954.1781

> -----Original Message-----
> From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Jonathan
> Lewis
> Sent: Monday, April 14, 2003 9:49 AM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: long runtimes cured by cutting hash_area_size by 90% - ???
>
>
>
> The general principle is that multiple
> hash joins can be running concurrently
> and Oracle 8 is not very sensible about
> choosing how to exercise damage limitation
> when this occurs. (As it often does in
> warehouse systems).
>
> The side-effects, which are very much
> query and data depended, are extreme
> uses of memory, or extreme thrashing
> of temporary space.
>
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk

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Author: Larry Elkins
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