RE: Backup for VLDB

FOR YOUR INFORMATION ESIS and EPFAL are now part of Logica. The Internet email addresses of the staff has changed to the following - lastnameinitial_at_logica.com eg SMITHK_at_logica.com. Emails using the old format will continue to be delivered until 30th June 2001.

>From the sites I have worked at recently RMAN seems to be the way to go. It
certainly seems a lot more robust and reliable than it was in its earliest release.
The 'normal' way of operation I have seen is either Use a 3 way mirror, shut down the database, start up then shutdown normal, then split one mirror. The database can then be restarted (total outage less than 20 minutes)
The backup then takes place against the 3rd mirror and is a cold backup and can be written to tape. The 3rd mirror is then synced or re-silvered at your convenience after the backup is complete (5 hours later?). One advantage of using this method is that the 3rd mirror is kept un-synced all day until just before the backup ( we used EMC BCVs) and then merged. Therefore there is a good copy of the database almost immediately available that only needs 1 day's set of archive log applying in the event of a recovery.

The other option is for hot backups, again using RMAN. Perhaps back up to disk and then archive to tape at your leisure. No downtime necessary

For the benefits of RMAn read an execllent essay by Tim Gorman of SageLogix - Is RMAN really worth the trouble. A link can be found from www.timonions.com <http://www.timonions.com> site

HTH John

John Hallas

• +44 (0) 115 945 6643
• +44 (0) 115 945 6774

This e-mail and any files transmitted with it, are confidential to Logica and are intended solely for the use of the individual or entity to whom they are addressed.

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Hallas, John
  INET: HallasJ_at_logicae.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).