RE: Duplexing Archived Log Files

From: Mohan, Ross <MohanR_at_STARS-SMI.com>
Date: Thu, 06 Dec 2001 15:00:35 -0800
Message-ID: <F001.003D6DE1.20011206141520@fatcity.com>

if you duplex mandatory and one server destination fails..is fixed...the time lag for the db to become aware of the now-available second mandatory location can be lengthy.

I have witnessed a test where it took 11 Minutes.

that's a loooong time, when you are waiting for the db to "figure out" that everything is fixed and available to restart....

same type of symptoms as a full archive log dest location, but longer recovery/awareness time.

hth

ross

-----Original Message-----
Sent: Thursday, December 06, 2001 1:29 PM To: Multiple recipients of list ORACLE-L

Is anyone using the LOG_ARCHIVE_DUPLEX_DEST parameter? Any problems with it?

We are on Oracle 8.1.6 on Compaq Tru64. On our ERP 150-gig. database, we are currently doing a cold backup weekly. This means that we are very dependent on archive logs.

• Recovery time isn't a big concern. In the event of a failure, recovery time isn't that critical. Loss of a week of work would be.
• We have tried hot backups successfully on smaller databases, but we found that once we issue ALTER TABLESPACE BEGIN BACKUP there was often a delay of hours for that command to complete. So we gave up on hot backups.
• We are starting to work with RMAN and feel in the long run this will be an ideal solution. Thanks to everyone for answering my newby RMAN questions.
• Recently Oracle has added a feature to duplex the archive log files. This sounds like it would lessen our archive log vulnerability. However, it causes my sys admin more work, so I would appreciate some feedback before I add this burden to his work. Thanks for any thoughts you care to share. Dennis Williams DBA Lifetouch, Inc. dwilliams_at_lifetouch.com
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Author: Mohan, Ross
  INET: MohanR_at_STARS-SMI.com

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