RE: performance when inserting into child tables

From: Mercadante, Thomas F <thomas.mercadante_at_labor.state.ny.us>
Date: Wed, 21 Apr 2004 14:44:22 -0400
Message-ID: <DE8A21F8F1D0254EA4A9214D52AB2FEDAD5B53@exchsen0a1ma>

No - haven't tested it. I guess I wouldn't want to go changing my production system just on an Oracle class say-so.

How would you test it? If it takes a lock and "quickly" releases it, can we see how long the lock was held for?

Tom Mercadante
Oracle Certified Professional

-----Original Message-----

From: Jared.Still_at_radisys.com [mailto:Jared.Still_at_radisys.com] Sent: Wednesday, April 21, 2004 2:38 PM
To: oracle-l_at_freelists.org
Subject: RE: performance when inserting into child tables

"The lack of indexes for the FK's will cause a share lock to be taken out on the child table when ever the parent is deleted or updated." The most recent Oracle class I took said that in 9i, this lock on the child
table is taken and released immediately. Supposedly to speed the process up
a bit.

I did consider that this might have changed in 9i.

The posted didn't mention a version, so I didn't pursue it.

Have you tested to see if this is what happens in 9i?

Jared

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Received on Wed Apr 21 2004 - 13:42:08 CDT