Microsoft Exchange Performance Counters

Microsoft Exchange Mailbox Server Database counters

The following table shows database counters.

Counter Name Description
Counter Name: MSExchange Database ==> Instances(*)\Log Generation Checkpoint Depth Description: Represents the amount of work in the log file count that needs to be redone or undone to the database files if the process fails.
Counter Name: MSExchange Database Instances(*)\I/O Database Reads Average Latency Description: Shows the average length of time, in ms, per database read operation.
Counter Name: MSExchange Database Instances(*)\I/O Database Writes Average Latency Description: Shows the average length of time, in ms, per database write operation.
Counter Name: MSExchange Database(Information Store)\Database Cache % Hit Description: Shows the percentage of database file page requests fulfilled by the database cache without causing a file operation. If this percentage is too low, the database cache size may be too small.
Counter Name: MSExchange Database(Information Store)\Database Cache Size (MB) Description: Shows the amount of system memory, in megabytes (MB), used by the database cache manager to hold commonly used information from the database files to prevent file operations.
Counter Name: MSExchange Database(Information Store)\Database Page Fault Stalls/sec Description: Shows the rate that database file page requests require of the database cache manager to allocate a new page from the database cache.
Counter Name: MSExchange Database(Information Store)\Log Record Stalls/sec Description: Shows the number of log records that can't be added to the log buffers per second because the log buffers are full. If this counter is nonzero for a long period of time, the log buffer size may be a bottleneck.
Counter Name: MSExchange Database(Information Store)\Log Threads Waiting Description: Shows the number of threads waiting for their data to be written to the log to complete an update of the database. If this number is too high, the log may be a bottleneck.
Counter Name: MSExchange Database(Information Store)\Version buckets allocated Description: Shows the total number of version buckets allocated.
Counter Name: MSExchange Database\Log Bytes Write/sec Description: Shows the rate of bytes written to the log.