RE: ALTER TABLE LOCK DISABLE

From: Wolfson Larry - lwolfs <lawrence.wolfson_at_acxiom.com>
Date: Fri, 25 Mar 2005 14:51:27 -0600
Message-ID: <B39B7B7D8C8CEA419D0ED45FD7FA4C5331CAC8@CWYMSX06.Corp.Acxiom.net>

Ummmmmmm, I didn't say he said this would have to be permanent, that is; you enable it while you're doing maintenance and then disable it when you're done.

I kinda like the fact that people couldn't inadvertently drop a table.

Also he didn't restrict this to a RAC environment.

So have you actually measured this?

Thanks

Larry

PS I will take a look at Steve's book. Thanks again.

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

From: K Gopalakrishnan [mailto:kaygopal_at_gmail.com] Sent: Friday, March 25, 2005 2:44 PM
To: Wolfson Larry - lwolfs
Cc: oracle-l_at_freelists.org
Subject: Re: ALTER TABLE LOCK DISABLE

Larry:

I wouldn't subscribe to DISABLE TABLE LOCKS arguement as that posses a serious threat to HA operations. You can not re-build indexes or do any online table maintenence operations that requires table locking. It was even documented in Steve's internals book. But that is for OPS.

Now with significant enhancements in RAC, with faster messaging functions, I really do not see much performance improvement in disabling table locks. And also what percentage gain you get from disabling table locks is questionable..

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Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004 http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

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http://www.freelists.org/webpage/oracle-l Received on Fri Mar 25 2005 - 15:55:27 CST