i could have swarn i read in multiple places that in a high transaction system hitting v$views repeatedly kills performance? causes excessive latching?
ill have to test it to see if this is better than a count. Gonna be ugly either way.
>
> From: "Jamadagni, Rajendra" <Rajendra.Jamadagni_at_espn.com>
> Date: 2003/12/30 Tue PM 01:29:25 EST
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: RE: Re: help with estimate row count from asktom
>
> Don't be afraid to access v$ views, just beware of the bug that throws a ora-600 when selecting 'filter_predicates' and 'access_predicates' under 9202. As a workaround, don't select those two columns. If I were you, I'd make sure that users are *very* clear that the number you are going to get is an 'ESTIMATE' only.
>
> We run with statistics_level=ALL, haven't seen any noticeable difference, YMMV.
> Raj
> --------------------------------------------------------------------------------
> Rajendra dot Jamadagni at nospamespn dot com
> All Views expressed in this email are strictly personal.
> QOTD: Any clod can have facts, having an opinion is an art !
>
>
> -----Original Message-----
> Sent: Tuesday, December 30, 2003 1:19 PM
> To: Multiple recipients of list ORACLE-L
>
>
> im concerned about hitting the v$views in production. we have 30,000 users. its either that or do counts. Its a requirement from the users. not sure what to do. doesnt tom kyte do this on asktom?
>
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> Author: Jamadagni, Rajendra
> INET: Rajendra.Jamadagni_at_espn.com
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Received on Tue Dec 30 2003 - 13:24:32 CST
