Sitting here in our Disaster Recovery class at SQL Connections and Kimberly’s on till lunch so I’m banging out a quick blog post covering the database mirroring (DBM) specific questions.

 

Q1) Can I use IP addresses instead of server names when using the DBM Monitor?

 

A1) Unfortunately not.

 

Q2) Is there any in-built throttling mechanism in DBM to allow the mirror to catch-up when synchronizing a synchronous mirroring session?

 

A2) Yes, if there’s more than 1MB of transaction log on the principal that hasn’t been sent to the mirror, the mirroring session state will be switched from SYNCHRONIZED to SYNCHRONIZING and the principal itself will start adding a few milliseconds delay to transaction commits until the amount of unsent log drops below 1MB

 

Q3) Are there any tips when setting up a mirroring session using backups?

 

A3) Yes, make sure that all the backups are restored WITH NORECOVERY on the mirror. The database has to be unrecovered otherwise the mirroring session cannot start and you’re back to square one with restoring the mirror database.

 

Q4) What are the performance considerations with DBM – both in terms of the impact on the application workload and on DBM itself?

 

A4) Here are some links to resources that discuss this:

 

 

 

Q5) Any other resources?

 

A5) Blog posts…

 

 

 

Enjoy!

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