event_summary database optimization alert

I have received the following event in Zenoss:

Optimizaton of event_summary exceeded threshold of 120 seconds. This exceeds the warn
threshold of 120 seconds (configurable in etc/zeneventserver.conf with the setting
zep.database.optimize_elapsed_warn_threshold_seconds). This may be indicative of a
performance issue with the zenoss_zep database server. Analyzing the performance of
your database optimize calls may be needed. If the process is running as expected you can
increase the warn threshold to a reasonable setting for your environment.

What precisely do I need to do to "analyze the performance of the database optimize calls"

Michael Ducharme