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DBMIRROR_EVENT_QUEUE

I was recently attempting to re-establish mirroring for a client and realized the following waittype hanging on the database.





I initially thought, the mirroring session was not removed correctly but after further verification it was soon obvious that the mirroring session had been discontinued and it was clean.

When I attempt to kill the process PSID = 20 , I got the following message 
Spid = 20
Msg 6107, Level 14, State 1, Line 1
Only user processes can be killed.


At 2 am in the morning I was no mood for research , I was just interested in getting the mirroring session established and get to bed.
I knew it was a matter of dropping the database and getting about with the normal business. Then I mistakenly executed the restore databases script !!!!. surprisingly the restore didn’t complain and progressed to complete without errors and I continued to setup the mirroring session, which completed successfully.

Later during the day I discovered that this could have been an a idel/orphaned session that was left behind when mirroring was aborted.  


http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/301e9248-5900-4f9e-ab22-0745ce72bc1e/

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