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 Multiple Mirrored databases, D/T/P, 1 witness??
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Posted - 10/03/2013 :  06:36:11  Show Profile  Visit aspeckman's Homepage  Click to see aspeckman's MSN Messenger address  Reply with Quote
It was suggested to me that we could just have 1 witness for all of our {application name} databases for development, test, and production.

While keeping one witness for one production database instance makes sense to me, why on earth would I want one witness for multiple DB instances?

I like keeping devl/test/prod separate. So lets assume that is correct, one witness for development databases, another witness for test, and another witness for prod.

But, if you have multiple databases instances(e.g. in production) installed on either the same server or seperate servers, it doesn't seem best practice to use one witness for them all.

I think we should have 1 witness per database instance and configure all mirrored databases on that one instance to use 1 witness and not share that witness with other DB instances.

What is best practice for mirror witness to database instance?


Most Valuable Yak

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Posted - 10/03/2013 :  07:30:07  Show Profile  Visit robvolk's Homepage  Reply with Quote
The only best practice I've encountered regarding a mirror witness is that it is in a separate physical location from both the principal and mirror. This is to guard against site failure (storm, power, etc.) that would affect 2 or more instances in the configuration. Other than that, there's no particular rule against using a single witness for all instances, it's simply a matter of preference. I'd suggest you'd want more than one witness if you'll be mirroring hundreds of databases, just to balance things out. And to have a dedicated witness for a production environment.
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