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06.24.2008 at 01:51AM PDT, ID: 23510229
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7.2

Oracle backup issue

Asked by vamsi_uk in Oracle 10.x, Oracle Database

Hi Experts,

We have an Oracle 10g database running on RHEL 4.0. Everyday we take a full backup using RMAN. The RMAN script takes full backup onto a disk partition (/backup) which is about 120GB. The average size of the backups is around 90GB. But sometimes, we run some operations which could generate huge number of archive log files which causes the backups to fail as the partition size is not enough. Now i can simply increase size of the partition as we have around 20GB more which should cover those scenarios where we might generate excessive archives on a particular day. But i am looking to tune the backups somehow so that i can infact use the same partition size and also reduce the backup size. So i tried using compression method for both datafiles and archive log files. following are the results of my tests:
[code]
RMAN backup without compression:

Completion time - 1 hour approximately
size of the backup - 90GB approximately

RMAN backup with compression

Completion time - 13 hours
size of the backup - 21GB approximately ( saving more than 50GB of space)
[/code]

Now the reason for the enormous time difference is due to the fact that there is a LOBOBJECTS tablepsace which is around 24GB in size and this tablespace alone took around 7 hours of time to backup where as the other backup sets completed in around 2 hours (even though the size is around 19GB which is not ver far from 24GB). I am assuming that RMAN cannot really compress LOB objects or maybe it just takes too much time for to compress these objects.

So, my questions is that is there a way in RMAN where i can tell it to exclude LOBOBJECTS tablespace and put another RMAN scripts where i can just backup this tablespace. But i am wondering even if thats possible, what impact it might have on any recovery scenarios? We do use standby database, so unless both the database servers crash, we would not necessarily do the complete recovery. Could you please share your views and thoughts on this problem please?

I am also looking at this article which recommends to use block change tracking for faster backups and faster recoveries..

http://www.oracle.com/technology/oramag/oracle/04-nov/o64rman.html

Many Thanks

VamsiStart Free Trial
[+][-]06.24.2008 at 02:37AM PDT, ID: 21853757

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[+][-]06.24.2008 at 02:41AM PDT, ID: 21853781

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Zones: Oracle 10.x, Oracle Database
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Solution Provided By: schwertner
Participating Experts: 1
Solution Grade: B
 
 
[+][-]06.24.2008 at 02:46AM PDT, ID: 21853806

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[+][-]06.24.2008 at 04:46AM PDT, ID: 21854589

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[+][-]06.24.2008 at 05:27AM PDT, ID: 21854905

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[+][-]06.24.2008 at 05:42AM PDT, ID: 21855011

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[+][-]06.24.2008 at 05:51AM PDT, ID: 21855093

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