RE: RULE vs. CHOOSE

Qs. Is there any Way to Generate the IDEAL OUTLINE Plans Plans in 1 Database
& Send it for Import to ALL the Various Sites World-wide ?

Qs. Is there any PACKAGE etc. which Automatically Causes Statistics to be ANALYZED in some SMALL proportions (Bit by Bit) while Live Operations

are in progress ? What would be the Overhead of Such a Package (if Exists) ?

Thanks so much for the Help

> -----Original Message-----
> From: Gillies, Garry [SMTP:garry_at_weir.co.uk]
> Sent: Wednesday, August 01, 2001 8:01 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: RULE vs. CHOOSE
>
>
> > From: VIVEK_SHARMA [<mailto:VIVEK_SHARMA_at_infy.com>]
> > Sent: 01 August 2001 08:05
> > Subject: RULE vs. CHOOSE
> >
> > Qs. Will COST Based Optimizer (CBO) or Rule Based Optimizer (RBO) be
>
> > used for the PARTITIONED Table in the Following Query ?
> >
> > NOTE OPTIMIZER_MODE is Set Explicitly to RULE , Run the
> > Following SQL :-
> >
> > SELECT <Some Columns>
> > FROM <Partition Table> , <NON-Partitioned Table>
> > where <Partition Table>.Column = <NON-Partitioned Table>.Column
> >
> > Assuming <Partition Table>.Column is the PARTITION KEY
> > & BOTH <Partition Table> & <NON-Partitioned Table> are ANALYZED .
> >
>
> Development stopped on RBO at version 7. Partitioning is a version 8
> feature. Since RBO has no knowledge of dealing with partitions, CBO
> must be used.
>
> > Qs. Will Only the Respective partition be SCANNED in the Above Query
> ?
>
> No. There is nothing in that query that tells the optimiser that only
> a particular partition will be required.
>
> > Qs. Would there be Any Disadvantage in SETTING OPTIMIZER_MODE=RULE
> for
> > the Above Query ?
>
> It would be ignored. The CBO would be used, defaulting to ALL_ROWS.
>
> > Qs. How is it Best Possible to KEEP the SAME (BEST) Execution Plan
> at
> > Various Sites where the SAME PRODUCT Exists
>
> Yes, but you must be using CBO - see CREATE OUTLINE in SQL reference
> manual.
>
> > Qs. Is there any PACKAGE etc. which Automatically Causes Statistics
> to
> > be ANALYZED in some SMALL proportions (Bit by Bit) while Live
> > Operations
> > are in progress ? What would be the Overhead of Such a Package (if
> > Exists) ?
>
> I do not know.
>

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--
Author: VIVEK_SHARMA
  INET: VIVEK_SHARMA_at_infy.com

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