cially in single-user
systems; there's no need to isolate other users from the effects of
changes when there are no other users.</p>
        <p>Another important data management service is recovery. Strictly
speaking, recovery is a procedure that the system carries out when it
starts up. The purpose of recovery is to guarantee that the database is
complete and usable. This is most important after a system or
application crash, when the database may have been damaged. The recovery
process guarantees that the