Topic Last Modified: 2006-09-06

The Microsoft® Exchange Server Analyzer Tool includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange 2000 Server or Exchange Server 2003. The performance data collection engine collects data from the Cat: Messages submitted/sec and the Cat: Categorizations completed/sec performance counters of the SMTP Server performance object to analyze performance data.

The Cat: Messages submitted/sec performance counter shows the number of messages submitted per second to the categorizer whereas the Cat: Categorizations completed/sec shows the rate of categorizations completed per second.

The Exchange Server Analyzer compares the average total of the two counters to determine whether more messages are consistently submitted than are processed.

If the Exchange Server Analyzer determines that the average total number of messages submitted per second to the categorizer is consistently greater, by two messages, than the average total number of messages completed per second, the Exchange Server Analyzer displays a warning.

The categorizer performs the following core operations:

This warning indicates that the categorizer may be under stress. Possible causes should be investigated and remedied where you can.

Categorizer stress can be caused by a demand to process many messages because of:

To address this warning: