Rolling Back a Restore

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Rolling Back a Restore

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Steve Jones - SSC Editor

Posted Saturday, March 20, 2010 11:20 AM

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Comments posted to this topic are about the item Rolling Back a Restore

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Post #886934

Lynn Pettis

Posted Saturday, March 20, 2010 12:35 PM

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Interesting idea. I think it would be good idea and perhaps implemented by extending the RESTORE statement, perhaps RETAIN_OLDDB with maybe a couple of options to it.

Curious what others may think.

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Post #886947

SQLRNNR

Posted Sunday, March 21, 2010 7:00 PM

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I like the idea. I see the only way of implementing it is as a new command or as an option on the restore command. Obvious complications would be disk space. You couldn't require that double your production database be stored side by side on the same storage, especially not if the space was limited already.

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Post #887133

Steve Jones - SSC Editor

Posted Monday, March 22, 2010 1:25 AM

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It would definitely double disk space, though for many dbs, this isn't an issue. I'd think you ought to be able to configure the "new dbs" on alternate storage if available.

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Post #887190

mpa

Posted Monday, March 22, 2010 1:47 AM

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As someone who measures five times, cuts once, I can certainly see the usefulness in this idea. It would be nice if there was an option to manually make the "switch" after verifying that everything went OK, or just make it do it automagically when the restore is done, though I'm not entirely sure how this would be accomplished.

Post #887199

GSquared

Posted Monday, March 22, 2010 6:27 AM

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So long as it was an option, I think it would be a good idea.

Of course, as a workaround, you can restore as a different name, then issue a drop on the database you're overwriting and a rename on the restored database. Wouldn't be "instant", but since the restore itself wouldn't be instant, I think it's a valid way to handle it.

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Post #887309

jay-h

Posted Monday, March 22, 2010 8:03 AM

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mpa (3/22/2010)

You can also re-name the existing db (users would need to be bounced off in any case before the restore), then restore the db. If anything goes wrong, you still have the original, or you can delete it when you are happy.

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Post #887397

Charles Kincaid

Posted Monday, March 22, 2010 8:54 AM

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I agree with what has been said. Disk space is a big issue. Also if your restore fails part way through will SQL server have enough resources to "roll back"?

I dislike the way restore operates from the GUI anyway. If my restore is not an exact overwrite of the backup then things get tricky. Unlike many of the Microsoft dialogs it does not warn you that you are about to overwrite existing files. I think that is should. It also does not warn you that referenced directory paths don't exist. For example some of my customers have databases on D: and for me D: is the DVD drive. Even if I use the "force restore over existing database" it does not always put the files in the right place.

Would many of your concerns be addressed if the GUI restore tools were improved?

ATB

Charles Kincaid

Post #887428

fhanlon

Posted Monday, March 22, 2010 9:06 AM

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While its an interesting idea, I'm not sure I really see a benefit here. I can already restore to a different name if I want so if this fuction is useful to me I can esentially do this already. The RESTORE statement is pretty flexible already. I'm not sure I would want default behavior restoring to a test name.

Francis

Post #887436

Stephen Grimshaw

Posted Monday, March 22, 2010 9:52 AM

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This sounds like something we do .
We have a file that tells a browser-based application the name of the database it should use. New versions of the database (built behind our firewall from wider data) are restored using a different name. If Restore is successful, the name in the file ia changed.

Post #887469

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