Database Snapshots

The question you need to ask is do you feel lucky? Well, do you punk? This paraphrased question from Dirty Harry might be what you need to ask yourself when you do SAN based backups of your data instead of a SQL Server backup. I have written about this before, but this article by Denny Cherry is worth re-reading.

If you’re the systems team and you’ve sold management on this great snapshot based backup solution so that the DBAs don’t need to worry about it, guess what conversation I’m having with management? It’s going to be the “I’m no longer responsible for data being restored in the event of a failure” conversation. If you handle the backups and restores, then you are responsible for doing them, and it’s your butt on the line when your process isn’t up the job. I don’t want to hear about it being my database all of a sudden.

Just make sure that you keep in mind that when you can’t restore the database to the correct point in time, it’s probably game over for the company. You just lost a days worth of production data? Awesome. How are you planning on getting that back into the system? This isn’t a file server or the home directory server where everything that was just lost can be easily replaced or rebuild. This is the system of record that is used to repopulate all those other systems, and if you break rules number one and two above you’ve just lost all the companies data. Odds are we just lost all our jobs, as did everyone else at the company. So why don’t we leave the database backups to the database professionals.


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