RE: Backing up large DBs on ASM
- From: John Hallas <John.Hallas@xxxxxxxxxxxxxxxxxx>
- To: "Amir.Hameed@xxxxxxxxx" <Amir.Hameed@xxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 23 Jun 2009 08:30:07 +0100
Is this a DW by any chance. If so then use of readonly tablespaces with the
skipreadonly clause in the RMAN command should help reduce volume (combined
with a long-term retention policy on the tapes of course).
Cumulative backups (level 1) and use of a block change tracking file should be
investigated.
I am surprised it is not quicker to disk than tape. Are you using multiple
channels.
John
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Hameed, Amir
Sent: 22 June 2009 03:50
To: oracle-l@xxxxxxxxxxxxx
Subject: Backing up large DBs on ASM
Folks,
One of our large client has a very large DB (~40TB) configured with ASM.
They are currently using RMAN to back it up to tape and it takes a very
long time to do that. They have also tried backing up to disk but the
timing has not really improved much. What they are looking for is ways
to speed up the backup and restore timing. I am not directly involved
with this client and do not have extensive experience with ASM and RMAN
either. Are their any ways and best practices to speed up backups on ASM
for very large DBs. Any feedback will be greatly appreciated.
Thanks
Amir
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