If the readserver parameter in ovdb.conf is true,
ovdb_init will start ovdb_server.
ovdb_server opens the overview database, and accesses it
on behalf of the nnrpd reader processes.
To shut down ovdb_server, send a TERM signal to the process ID
in pathrun/ovdb_server.pid . The parent process will shut
down its children and wait for their exit before exiting itself.