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RE: OPS and redos

From: Scott <oraracdba_at_YAHOO.COM>
Date: Wed, 03 Jul 2002 10:18:33 -0800
Message-ID: <F001.0048F2A4.20020703101833@fatcity.com>


John, I actually have never sat down tested to see when Oracle actually does the redo kick. I do have a OPS and RAC test environment so I may have to see how big the GAP gets before Oracle starts doing log archive switches on the idle node.

The only reason I have heard why Oracle does this kick is to keep on-line redo logs archiving off of idle instances, while other active instances generate redo and archive on-line logs. The intent is to keep archive streams from all participating instances close to each other in time, so that a set of archived logs for all redo streams/instances can easily be identified and managed for backup or recovery. Also used in executing the ALTER SYSTEM ARCHIVE LOG CURRENT command, which is used to cause all instances to archive their current logs.

I know Anjo has some detail on this feature. So he may be able to provide more information.

Scott


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Received on Wed Jul 03 2002 - 13:18:33 CDT

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