Oracle-L: RE: HP-UX 11.0/8.1.6.2.0/Optimizer

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Mon, 24 Jun 2002 16:23:34 -0800
Message-ID: <F001.00486082.20020624162334@fatcity.com>

Mike,

> Shazzam. Back to 2 minutes. Huh? But Optimizer-mode is RULE!!
>
> How? Why? I look stupid and so does my whole DBA group.
> Does anybody have any insights about this behavior?

Contrary to common understanding, the Cost based optimizer is 'forced' in certain situations even if the mode is RULE. Examples are: Use of hints other than RULE, 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), etc. Was this the case? This was the focus of my paper at IOUG... John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002

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The opinions and statements above are entirely my own and not those of my employer or clients ** -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: John Kanagaraj INET: john.kanagaraj_at_hds.com

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