RE: Analyze with rule based optimizer

One point more is that if your optimizer_mode is set to CHOOSE, COST based will be used if one partitioned table is referred in the query, even if the table has not been analysed.

-----Mensaje original-----
De: Guidry, Chris [mailto:chris.guidry_at_atcoelectric.com] Enviado el: Viernes 7 de Julio de 2000 14:16 Para: Multiple recipients of list ORACLE-L Asunto: RE: Analyze with rule based optimizer

Hi,
Another point, if you rely on ordered indexes and are set to CHOOSE your indexed queries may not be ordered after you analyze. Moral of story... program using KISS method.

-
Chris J. Guidry P.Eng.
ATCO Electric, Metering Services
Phone: (780) 420-4142
Fax: (780) 420-3854
Email: chris.guidry_at_atcoelectric.com

> -----Original Message-----
> From: Rod Corderey [SMTP:RodCorderey_at_Lane-Associates.com]
> Sent: Friday, July 07, 2000 3:13 AM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Analyze with rule based optimizer
>
> Another point to bear in mind is that if your optimizer_mode is set to
> CHOOSE, COST based will be used even if only one table referred to in
> the query has been analysed.
>
> This can lead to full table scans on the remaining un-analysed tables in
> the query from list.
>
> Rod
>
> --
> Rod Corderey
>
> Lane Associates
> RodCorderey_at_Lane-Associates.com
> http://www.Lane-Associates.com
>
> djordjej wrote:
> >
> >
> > If it is set to RULE it will not use the statistics. If it CHOOSE it
> will
> > consider statistics.
> >
> > Djordje
> >
> > -----Original Message-----
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Date: Thursday, July 06, 2000 6:43 PM
> >
> > >
> > >If tables were analyzed on an 8.0.5 database that was set to
> > >RULE, will it effect anything or will it just ignore that they
> > >were analyzed and continue to use RULE anyway?
> > >
> > >-----
> > >Sent using MailStart.com ( http://MailStart.Com/welcome.html )
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> > Author: djordjej
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> Author: Rod Corderey
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-- 
Author: Guidry, Chris
  INET: chris.guidry_at_atcoelectric.com

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