    If set, maintain transaction logs in memory rather than on disk.  This
                 means that transactions exhibit the ACI (atomicity, consistency, and
                 isolation) properties, but not D (durability); that is, database
                 integrity will be maintained, but if the application or system fails,
                 integrity will not persist.  All database files must be verified
                 and/or restored from a replication group master or archival backup
                