You can select which types of user-related activity are logged in the database, and available for reporting in the Activity trails task.
The data for Activity logging is saved to the Directory database. If you are using the
Express edition of SQL Server, which has a storage limit, make sure that it has enough
available space. Enable Disk
space and Database usage notifications for the Directory in Server Admin to warn you
when space on the database is running low. We recommend that you configure the
Database usage value to 90% or less, to give you enough time to take
action.
The activities you can log are events that are generated by users who connected to
Security Center.
You can now search for events in your system that were triggered by users, using the
Activity trails task.