RE: RMAN restore times
- From: "Khemmanivanh, Somckit" <somckit.khemmanivanh@xxxxxxxxxxxxxxxx>
- To: "Hallas, John, Tech Dev" <John.Hallas@xxxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 8 Aug 2005 05:35:10 -0700
I'm really curious about item 1 below.
Does anyone know anything about this?
Thanks!
-----Original Message-----
From: Khemmanivanh, Somckit
Sent: Friday, August 05, 2005 8:26 AM
To: 'Hallas, John, Tech Dev'; Lora Martin; oracle-l@xxxxxxxxxxxxx
Subject: RE: RMAN restore times
Thanks for your response, I have 2 questions/clarifications:
1) You mention "RMAN backyp from the mirror then re-sync". How is this
possible? The mirror copy will be in hot mode, you have to recover the
database to open it. Doesn't the database have to be open in order for
RMAN to back it up?
Did I miss something? If so can you clarify?
2) Regarding restore times, what times have people been seeing with
RMAN? If you can post your tape technology that would be much
appreciated. If we stick with BCV then it's really hard to beat that
technology for restore times but can we get close?
Thanks!
-----Original Message-----
From: Hallas, John, Tech Dev [mailto:John.Hallas@xxxxxxxxxxxxxxxxx]
Sent: Thursday, August 04, 2005 11:53 PM
To: Khemmanivanh, Somckit; Lora Martin; oracle-l@xxxxxxxxxxxxx
Subject: RE: RMAN restore times
If I had BCVs available I would break the mirror then RMAN backup from
the mirror then re-sync.
You have a 2TB database. Somckit takes 4 hrs to restore a 4Gb file.
There should be / is a fundamental difference in resources or
configuration between those 2 setups.
If you have BCVs etc I would expect you to have fast tape technology and
the whole database should be restorable in maybe 4 hrs not just a 4Gb
file.
One of the major determining factors in restore times I have seen is the
time waited to load the required tape or the contention with other jobs.
That is often not taken into account when the overall time is
calculated.
John
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Khemmanivanh,
Somckit
Sent: 04 August 2005 18:21
To: Lora Martin; oracle-l@xxxxxxxxxxxxx
Subject: RE: RMAN restore times
Thanks for your feedback.
Yes, my main hesitation with the RMAN backups for such a large database
was the restore times.
Why would a 4 GB file take 4 hours to restore? Contention for tape
resources? Really slow tape drives, network?
Thanks!
-----Original Message-----
From: Lora Martin [mailto:lmartin@xxxxxxxxxxx]
Sent: Thursday, August 04, 2005 10:01 AM
To: Khemmanivanh, Somckit; oracle-l@xxxxxxxxxxxxx
Subject: RE: RMAN restore times
If you have BCV - I would use that. I have used EMC BCV... very fast...
then go to tape from there. When we restored 4GB file using RMAN from
tape on a 2TB system - the restore took 4 hrs
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