Parallel index property

I tried Googling and looking for my Oracle (10 g 2) of the document for this info "Concepts", but could not find anything, so I thought I'd post the question here.

What exactly does the parallel property of an index do?

I could SWEAR that I read once the property determined whether or not the index would be built/rebuilt at the same time, and that it would NOT affect the plan chosen by the optimizer, if a query has been executed on the table being indexed.

So I was surprised the other day when a fairly banal query, I ran against our production system engulfed 30 + process and contributed little to the errors where no new sessions can be created.

Looking at the properties of the table, I saw that the table was specified as "NOPARALLEL", but had two indexes, each specified "PARALLEL."

I run other (more selective) queries on this table and never had a problem in the past.

So my hypothesis is now (and correct me if I'm wrong), parallel with the index property essentially tells the optimizer, "If you decide to use this index, consider using parallel processing, too?"

Thank you!

It is at once - it will build in parallel and later can also be used for parallel operations.

Therefore, if you do not keep it parallel activated while you must make a

ALTER INDEX xyz NOPARALLEL;

See also:
http://blog.tanelpoder.com/2007/06/23/a-gotcha-with-parallel-index-builds-parallel-degree-and-query-plans/

Published by: DomBrooks on July 29, 2010 14:34

Tags: Database

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