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Re: File Restoration/Recovery

From: Darrell Landrum <DLANDRUM_at_zalecorp.com>
Date: Fri, 14 Mar 2003 10:50:34 -0800
Message-ID: <F001.0056A8D7.20030314105034@fatcity.com>


Gary,

I second this user's comments. Is it possible to get a valid backup while the database is up? Yes, it is but it is just plain silly (at the very least), to plan to do so. Whether or not this backup is good depends on no activity and if there's no activity, why not just shut it down and do the copy. If this is a development system, you're better off shutting it down to back it up. If it is production, it should be in archivelog mode and you can leave it up but do nightly 'hot' backups by putting the tablespaces in backup mode. I agree with you, I would not routinely, as a plan, write these files to tape (unless, perhaps, your setup allows you to write these files to the same tape(s) each night). If one were to make a list of different ways to backup this database and list them in order of best to worst, this idea of online copies would honestly be near or at the bottom.

Hope this helps.
Darrell

>>> wisernet100_at_yahoo.com 03/14/03 10:54AM >>> no no no no no no

If he is REALLY lucky, and no one is using the database at the instant he does all the copies (and I mean the OS as well), then MAYBE, POSSIBLY, if the Tooth Fairy and Easter Bunny are present and bless the copy, he might have a valid backup.

But I wouldn't bet my job on it.

He needs to have either a noarchivelog "cold" backup (database shutdown) done, which will restore to that point in time, or an archivelog "cold" backup (database shutdown) which will allow you to roll forward providing you also have the archived logs or an archivelog "hot" backup (database up, tablespaces in "begin backup" mode) which will allow you to let anyone keep working while you do the backup and then allow you to roll forward providing you have the archived logs.

Prove it to him: bet him something that will hurt him to lose, then do the copy the way he wants and try to start up the database. Just to ensure sure you prove your point, have some transaction that modifies data running in the database. If you can, make sure that that transaction is active enough to cycle through ALL your online logs and loop back to the first one.


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Received on Fri Mar 14 2003 - 12:50:34 CST

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