RE: [oracle-l] A few rman questions

From: Ruth Gramolini <rgramolini_at_tax.state.vt.us>
Date: Wed, 28 Jan 2004 08:14:49 -0500
Message-ID: <001a01c3e5a0$b51a3eb0$8459699f@vttaxnet.tax.state.vt.us>

Dan,

Robert Freeman has written a great rman book but I think the best place to start is with the Backup and Recovery Manual which is part of the Oracle documentation. In order to do point in time or complete recovery you need to have rman backups and controlfile backups. You can set up you rman configuration files to to autocontrolfile backups at the end of every backup and this will make a copy of your controlifle to a place you specify as the last step as well as the normal backup of the controlfile which is contained in a level 0 rman backup. With this feature, the controlfile which has the necessary info can be restored. Have a look at rman configurations in the docs.

Good luck,
Ruth

  -----Original Message-----
  From: oracle-l-bounce_at_freelists.org
  [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Daniel Hanks   Sent: Tuesday, January 27, 2004 4:59 PM   To: oracle-l_at_freelists.org
  Subject: [oracle-l] A few rman questions

I'm in the process of revamping our backup system (which is mostly inherited from another DBA), and had a few questions about rman I've come across as I review the system.

'copy' vs. 'backup'. In our current setup, we use the 'backup' rman command to handle the datafiles, and the archive logs, but 'copy' is used to backup the controlfile. The Oracle documentation says this:

"In many cases, copying datafiles is more beneficial than backing them up, since the output is suitable for use without any additional processing. In contrast, you must process a backup set with a restore command before it is usable. So, you can perform media recovery on a datafile copy, but not directly on a backup set, even if it backs up only one datafile and contains a single backup piece."

So am I better off just leaving the controlfiles (since they're small) handled by 'copy' instead of 'backup'? Is having to process a backup set containing one controlfile with a 'restore' command that much of an issue? Maybe making a backup set of a single controlfile is overkill?

2) Are there any "Best practices" documents with respect to rman that list members would recommend?

Thanks again for your helpful comments,

Dan
Daniel Hanks - Systems/Database Administrator About Inc., Web Services Division

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Received on Wed Jan 28 2004 - 07:14:49 CST