An additional feature of the alarms infrastructure is automatic cleanup of processed alarms. An internal thread runs every so often, and purges all alarms marked as closed with a timestamp earlier than the given window. This daemon can be configured using the properties alarms.enable.cleaner, alarms.cleaner.timeout, alarms.cleaner.timeout.unit, alarms.cleaner.delete-entries-before and alarms.cleaner.delete-entries-before.unit. The cleaner is off by default. This feature is mainly useful when running over an XML store, to mitigate slow-down due to bloat; nevertheless, there is nothing prohibiting its use with RDBMS.