Re: dbshut script - shutdown or shutdown immediate

This topic is getting interesting once more. Lets contribute.

>>Multiplexing redo logs has nothing to do with the archive mode.

Take a situation wherein the db is in NOARCH mode with only one member per group (default setup). The dba gives shutdown abort and upon starting for some reason the active log could not be read for recovery. How would one perform a complete recovery?.

Let me know if you have a workaround.

I am willing to learn.

GovindanK

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"Daniel W. Fink" <optimaldba_at_yahoo.com> wrote:



>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!).

>

>-- 

>Daniel W. Fink

>http://www.optimaldba.com

>

>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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