When started (by "ovdb_init"), "ovdb_monitor" forks three processes
that perform routine database maintenance tasks. These are:
transaction checkpointing, deadlock detection, and transaction log
removal. The process ID of the parent is written to
pathrun/ovdb_monitor.pid. This PID is used by other INN
commands to verify that ovdb_monitor is running.
To shut down ovdb_monitor, send a TERM signal to the process ID
in pathrun/ovdb_monitor.pid . The parent process will shut
down the three children and wait for their exit before exiting itself.