RE: rman allocate channel suddenly taking forever
- From: "John Hallas" <john.hallas@xxxxxxxxxx>
- To: <robertgfreeman@xxxxxxxxx>, <gcunningham@xxxxxxxxxxxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 19 Sep 2007 11:46:32 +0100
At one site I worked at they had several concurrent catalogs but
generated new ones and switched the backups to use the new catalog and
then removed the old one after a few weeks when the backups past their
retention times.
If the catalog was not switched then had massive enqueue problems when
querying the catalog
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Freeman
Sent: 19 September 2007 03:34
To: gcunningham@xxxxxxxxxxxxxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: rman allocate channel suddenly taking forever
We are having some major performance problems with our recovery catalogs
these days!!
Contact Oracle and open an SR, there are several bugs open with catalog
performance and degrading performance.
RF
Robert G. Freeman
Oracle Consultant/DBA/Author
Principal Engineer/Team Manager
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Father of Five, Husband of One,
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from Osborne/McGraw Hill (Oracle Press)
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BLOG: http://robertgfreeman.blogspot.com/
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Gerald Cunningham
Sent: Tuesday, September 18, 2007 12:50 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: rman allocate channel suddenly taking forever
Hi all,
We run an rman level 0 backup of a Dataguard physical target
database, twice a week, to disk. The first thing the job does is
allocate 10 disk channels. This part of the job (the allocate commands)
usually takes 40 minutes to a little over an hour. For the last 3 runs
of this backup job, however, the allocate is taking over 9 hours.
I should note that this is a very large database with 10's of
thousands of data files. This is Oracle 9.2.0.7 64-bit on Solaris.
Any suggestions as to what we might look at? What exactly
happens internally during the allocate channel command? My rman catalog
db is generating 3.1 Gb or archive logs during the 9 hours that the
allocate channel commands are running.
Thanks for any help or pointers... we've searched Metalink but
came up with nothing.
Jerry
BJSS Limited, 1st Floor Coronet House, Queen Street, Leeds LS1 2TW.
Registered in England with company number 2777575.
http://www.bjss.co.uk
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