RE: SQL statement with hints or without hints

Hi Jonathan,

Yes - my phrasing was incorrect. The list was off the Tuning/Perf Guide, but I should have phrased it correctly.

John

> -----Original Message-----
> From: Jonathan Lewis [mailto:jonathan_at_jlcomp.demon.co.uk]
> Sent: Friday, April 12, 2002 2:18 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: SQL statement with hints or without hints
>
>
>
> I think you have to be a little careful how
> you phrase your comment here.
>
> In your list there are some things which FORCE
> the use of CBO, even if the optimizer_mode is
> set to RULE; and there are some features which
> are activated ONLY IF the cost based optimizer
> is invoked.
>
> Off the top of my head, the following force CBO when
> they appear in an SQL statement
>
> · Partitioned tables and indexes
> · Index-organized tables
> · SAMPLE clauses in a SELECT statement
> · Parallel tables/indexes
>
> and the following are only recognised and used when
> the CBO has kicked in
>
> · Reverse key indexes
> · Function-based indexes
> · Query rewrite (materialized views)
> · Progress meter
> · Hash joins
> · Bitmap indexes and bitmap join indexes
> · Star transformations
> · Partition Views
> · Index skip scans
>
> and on these two I pass:
> · Star joins
> · Extensible optimizer
>
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> Author of:
> Practical Oracle 8i: Building Efficient Databases
>
> Next Seminar - Australia - July/August
> http://www.jlcomp.demon.co.uk/seminar.html
>
> Host to The Co-Operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
>
>
> -----Original Message-----
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: 12 April 2002 19:46
>
>
> Raj,
>
> Keep in mind that the CBO will be defaulted whenever the following is
> present:
>
> · Partitioned tables and indexes
> · Index-organized tables
> · Reverse key indexes
> · Function-based indexes
> · SAMPLE clauses in a SELECT statement
> · Parallel execution and parallel DML (i.e. presence of DEGREE on
> Tables/Indexes)
> · Star transformations
> · Star joins
> · Extensible optimizer
> · Query rewrite (materialized views)
> · Progress meter
> · Hash joins
> · Bitmap indexes and bitmap join indexes
> · Partition Views
> · Index skip scans
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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