32044

Product Name

Event ID

32044

Event Source

MSSQLSERVER

Component

SQLEngine

Symbolic

Name

SQLErrorNum32044

Message Text

The alert for ‘mirror commit overhead’ has been raised. The current value of ‘%d’

surpasses the threshold ‘%d’.

This database mirroring event is issued on the principal server instance to indicate that the

aggregate commit wait time reached or exceeded a user-specified threshold value because of

database mirroring. The wait time is the product of the number of transactions and the time of

each. For example, the following cases both produce 1000 milliseconds of wait time: 1000

transactions _ 1 millisecond, and 1 transaction _ 1000 milliseconds. An increased commit wait

time can be caused by a surge in the transaction count, delays in sending the log, or delays in

flushing the log on the mirror server instance.

The amount of mirror commit overhead is a performance metric that can help you evaluate the

current performance impact of synchronous operation. This metric is relevant only in high-

safety mode. Because high-safety mode is synchronous, the principal server instance waits to

commit the transaction after it sends a log record to the mirror server instance until it receives

confirmation that the mirror server instance has written the log record to disk. The log record

remains on disk on the mirror server instance while it waits to be restored to the mirror

database.

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