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
IOUG-A Live! April 27 - May 1, 2003 Orlando, FL Sunday, April 27 8:30am - 4:30pm - Problem Solving with Oracle 9i SQL Thursday, May 1 1:00pm - 2:00pm - Automatic Undo Internals
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
