The DBENV→set_lk_detect function specifies that the deadlock detector should be run whenever a lock blocks. This option provides for rapid detection of deadlocks at the expense of potentially frequent invocations of the deadlock detector. On a fast processor with a highly contentious application where response time is critical, this is a good choice. An argument to the DBENV→set_lk_detect function indicates which transaction to abort when a deadlock is detected. It can take on any one of the following values:
DB_LOCK_YOUNGEST Abort the most recently started transaction.
DB_LOCK_OLDEST Abort the longest-lived transaction.
DB_LOCK_RANDOM Abort whatever transaction the deadlock detector happens to find first.