Oracle-L: Re: dbshut script - shutdown or shutdown immediate

From: <Jared.Still_at_radisys.com>
Date: Wed, 02 Apr 2003 13:29:06 -0800
Message-ID: <F001.00578B6B.20030402132906@fatcity.com>

Thanks Dan, I've found myself defending that position from time to time.

Jared

"Daniel W. Fink" <optimaldba_at_yahoo.com>
Sent by: root_at_fatcity.com
04/02/2003 11:20 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
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        Subject:        Re: dbshut script - shutdown or shutdown immediate

Multiplexing redo logs has nothing to do with the archive mode. Logs are multiplexed so that an error writing to one of the members in a group does not cause the instance to terminate.

Myth - If you use disk mirroring, you don't need to multiplex your redo logs.
Reality - Mirroring only protects from hardware failure. It will not protect you from accidental deletion of the log (been there, had to fix it!).
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Daniel W. Fink
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IOUG-A Live! April 27 - May 1, 2003 Orlando, FL

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GovindanK wrote:
Shutdown abort is pretty drastic, are you sure shutdown immediate didn't work?

Well said. This topic has been circulating in many DBA forums for a long time. Shutdown immediate does rollback and will take time if no.of users is high. On the otherside, shutdown abort simply takes the db down and does not bother about anything else. As per manual, if you do a shutdown abort then you WILL need the online redo logs for recovery just in case. Think twice if your db is in NOARCHIVELOG mode. If your db is in ARCHIVE mode make sure the logs are multiplexed. Though Oracle's recovery seems to be sturdy, double check your backup & recovery strategies. Also, which option to use is influenced by how much downtime/shutdown time you can afford.

HTH GovindanK

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INET: Jared.Still_at_radisys.com

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