Microsoft Exchange Performance Counters

Microsoft Exchange Mailbox Server Active Database Copy IO Latency Requirements counters

The following table shows active database copy input/output (I/O) latency requirements counters. When these values are exceeded, the client experience degrades. For example, users may experience slow system performance and message delivery delays.

Counter Name Description
Counter Name: Database\Database Page Fault Stalls/sec Description: Indicates the rate of page faults that can't be serviced because there are no pages available for allocation from the database cache.
Counter Name: MSExchange Database\I/O Database Reads (Attached) Average Latency Description: Indicates the average time, in milliseconds (ms), to read from the database file.
Counter Name: MSExchange Database\I/O Database Writes (Attached) Average Latency Description: Indicates the average time, in ms, to write to the database file. This counter isn't a good indicator for client latency because database writes are asynchronous.