sql server - MS-SQL 2012 Principle "Freeze" -


yesterday had "freeze" of 1 of our customers mirrored database.

the symptom applications freezed. there no high cpu (~1% sql server , ~10% total) / memory (4gb free ) / disk (50gb free) utilisation.

i tried accessing principle-database microsoft sql server management studio. when tried open tables section application freezed well.

i stopped whole server , applications switched automatically mirror-database , continued if nothing happened.

after (re)starting stopped sql-server resume mirroring without problem.

i tried find information in windows events, except messages stopped server , resulting messages mirror became principle, there no failure event.

also our applications access database did not report issues.

as additional information (i don't know if it's of importance): have got job running backups database full backup every hour , differential backup every 15 minutes (the diff backups go bak file created full backup). backup files overwritten after 1 week. stored on witness-server

questions: there anywhere else might find information has happened? has of experienced similar?

thank suggestion.

thomas


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