Re: Temporary space needed to create a constraint
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oratune@xxxxxxxxx>, <mark.powell2@xxxxxx>, "oracle-l" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 10 Jul 2012 22:35:29 +0100
But if there is a pre-existing index that contains all the data needed to
enforce the constraint Oracle shouldn't need to do any sorting, it need
only do a full scan of the index to check that there are no duplicates.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com/all_postings
Author: Oracle Core (Apress 2011)
http://www.apress.com/9781430239543
----- Original Message -----
From: "David Fitzjarrell" <oratune@xxxxxxxxx>
To: <mark.powell2@xxxxxx>; "oracle-l" <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, July 10, 2012 9:31 PM
Subject: Re: Temporary space needed to create a constraint
Which is exactly what he's done -- the constraint creation runs out of temp
space even though no index is being created. The sort segment outgrows the
available temp space and then errors out. I can guess that Oracle is
ordering the keys to verify no duplicates exist before creating and
enforcing the primary key, but I can't prove that on my small playground
database.
David Fitzjarrell
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