We are running a two-node active/passive SQL Server failover cluster (SP3, Cumulative Update #12 - 9.00.4311.00).
Occasionally, during certain operations, the process will hang and in the activity monitor I'll see:
Database: master
Command: UNKNOWN TOKEN
This doesn't happen all the time, and only happens in two situations that I have noticed:
modifying a login in SQL Server that has the password complexity enforced
backing up the service master key
It hasn't impacted user activity yet, but it does lock certain tables. The process can't be killed; I have to restart the SQL Service when it's convenient.
Not sure what could be causing this. Any help would be greatly appreciated.
Thanks,
S