Processing Rule Properties, Filter Tab

Allows you to specify how events are filtered, or excluded, from the database. The fields are defined as follows:

Pre-filter
Specifies that for events matching the filter, Microsoft Operations Manager 2000 (MOM) stops evaluating further processing rules, and does not save matching events to the database.
Database Filter
Specifies that for events matching the filter, MOM continues evaluating processing rules, but does not save matching events to the database.
Conditional Filter
Specifies that for events matching the filter, MOM continues evaluating processing rules, but saves events to the database only if another processing rule match occurs.