RE: Parallel degree on tables and indexes

From: <Jared.Still_at_radisys.com>
Date: Mon, 16 Dec 2002 15:43:55 -0800
Message-ID: <F001.0051AB5D.20021216154355@fatcity.com>

Yes, but what was the question?

"Fink, Dan" <Dan.Fink_at_mdx.com>
Sent by: root_at_fatcity.com
 12/16/2002 10:00 AM
 Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
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        Subject:        RE: Parallel degree on tables and indexes

Ah, yes...the magic number. For all questions requiring a magic number, that
number is 42. ;)

-----Original Message-----
Sent: Monday, December 16, 2002 8:39 AM
To: Multiple recipients of list ORACLE-L

List,

Is there a 'magic' number for num_rows that you use in order to set the parallel degree on tables and/or indexes?

We were told to use parallel degree of 4 for tables having more than 100,000
rows. Some of the on-line queries are running in parallel mode thus making batch jobs to go serial for lack of parallel slaves.

Upon a closer look, we see tables/indexes having millions of rows having parallel degree set at 1 and tables/indexes having fewer than 100,000 rows are having parallel degree set at 4 etc.,

Is there a number for num_rows that you have been very successful to determine the parallel degree? Some of the indexes were re-built using parallel degree of 3 to reduce the 'create index' time but were not changed
back to 'noparallel' recently and I need to answer these questions.

TIA. Govind
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Author: <Govind.Arumugam_at_alltel.com
  INET: Govind.Arumugam_at_alltel.com

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Author: Fink, Dan
  INET: Dan.Fink_at_mdx.com

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Author:
  INET: Jared.Still_at_radisys.com

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