This option makes it possible for dbmlsync to delete old transaction log mirror files when either of the following two circumstances
occur:
the offline transaction log mirror is located in a different directory from the transaction log mirror
or
dbmlsync is run on a different computer from the remote database server
In a normal setup, the active transaction log mirror and renamed transaction log mirror files are located in the same directory,
and dbmlsync is run on the same computer as the remote database, so this option is not required and old transaction log mirror
files are automatically deleted.
Transaction logs in this directory are only affected if the delete_old_logs database option is set to On, Delay, or n days.