RE: Parallel degree on tables and indexes

From: Fink, Dan <Dan.Fink_at_mdx.com>
Date: Mon, 16 Dec 2002 10:00:03 -0800
Message-ID: <F001.0051A6C5.20021216100003@fatcity.com>

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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