Hello X$KG...;-),
Great to hear from you. You bring up a valid point. I
agree with your comment and there may have been a bit
of miscommunication on my part. I did suggest a
"dedicated RMAN server" for the task, I should have
said "dedicated RMAN servers". Running all the backup
jobs at the same time can cause the problem that you
have suggested. Staggering them is one option along
with the idea of creating multiple RMAN catalogs. The
main point I was trying to bring across was the need
for a "logical backup" of the RMAN catalog, over and
above a file-level backup of that database.
- K Gopalakrishnan <kaygopal_at_yahoo.com> wrote:
> Gaja:
>
> Having dedicated RMAN server is indeed a good idea,
> but RMAN catalog is not designed for that much (!!?)
> high concurrency. If you look at the commands
> (executed
> by the RMAN during backup) very closely, you will
> see
> lots of SELECT for UPDATE and this will cause a big
> bottleneck in the backup process.
>
> It happened at one of our client place where they
> backup
> 200+ databases with a single RMAN catalog at 2-3
> hrs
> interval. The workaround suggested was
> a) Have more RMAN Catalogs
> b) Run the backup in different times.
>
> So again it 'all depends '
>
> Best Regards,
> K Gopalakrishnan
>
>
>
>
> -----Original Message-----
> Krishna Vaidyanatha
> Sent: Friday, April 04, 2003 4:04 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Paul et al.,
>
> I agree with Paul's setup of a dedicated RMAN
> catalog
> server. It is not a bad idea to have the datafiles
> for
> this database on mirrored volumes. I also think a
> good
> practice related to "saving the catalog" against
> tape
> media errors is to do a full export on the RMAN
> Catalog DB and stash the export dumpfile away on a
> mirrored volume away from the datafiles.
>
> If this DB has nothing but the RMAN catalog, it
> should
> not be very large (let me know if this is otherwise)
> and thus the full export will be a good method to
> have
> a "logical backup". One more thing to save the skin
> on
> your back, at a time of need. When Murphy is around
> I
> think the word "mercy" vanishes from the English
> dictionary.
>
>
> Cheers,
>
> Gaja
>
> --- Paula_Stankus_at_doh.state.fl.us wrote:
> > I have setup a server for just rman catalog backed
> > up to tape with clones
> > offsite for DR. It makes it easier as scripts are
> > parameterized to keep
> > aware of backup statuses = etc. Having this on a
> > centralized management
> > server and can't believe this isn't just common
> > practice. Just make sure no
> > single point of failure.
> >
> > Oracle OCP DBA
> >
> >
> > -----Original Message-----
> > Sent: Friday, April 04, 2003 3:39 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Deepak
> > You may also wish to consider not using
> > catalog(s) -- control file
> > backups. This might make it easier to add and
> remove
> > databases in your
> > environment. I'm presuming most databases are on
> > their own server.
> > If you want to be able to run a single query
> that
> > will report any backup
> > problems across all your databases, you will use a
> > single catalog.
> >
> > Dennis Williams
> > DBA, 40%OCP, 100% DBA
> > Lifetouch, Inc.
> > dwilliams_at_lifetouch.com
> >
> >
> > -----Original Message-----
> > Sent: Friday, April 04, 2003 2:09 PM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> >
> > We are in the process of moving from traditional
> hot
> > backups to one using RMAN. Total databases are
> > around
> > 200+. Should we be using 1 or few RMAN catalogs,
> or
> > 1
> > catalog per database?
> >
> > Thanks,
> > Deepak
> >
> > __________________________________________________
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> =====
>
>
> __________________________________________________
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> Author: Gaja Krishna Vaidyanatha
> INET: oraperfman_at_yahoo.com
>
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Received on Sun Apr 06 2003 - 12:13:38 CDT
