Call SetSweepInterval set the sweep interval for the database. The sweep interval refers to the number of transactions between database sweeps. 

To turn off database sweeps, set the sweep interval to 0. 

Sweeping a database is a systematic way of removing outdated records from the database. Periodic sweeping keeps the database from getting too large. However, sweeping can also slow performance. For more information, refer to 'Setting the sweep interval' in the InterBase 6 Operations Guide.