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We are implementing a mirroring for ms-sql 64bit 2008 database. Are there are limits to how many databases can be mirrored? We are going to mirror 1000 small databases with a total size of 2TB. Network bandwidth is not an issue.

Have anybody done that?

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With 32bit SQL Server, there are limits due to the number of worker threads - Paul Randal blogged about it - his blog is mentioned on the following KB:

The SQLCAT team blogged about best practices with mirroring on 64bit, and this should help you decide appriopriately:

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