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The following diagram illustrates the perfect storm condition that causes a deadlock or deadly embrace to occur within Oracle. In the event of deadlock, Oracle writes the message and error in the form of an ORA-60 error to the Oracle alert.log file. Deadlocks prevent some transactions from continuing to work. The Enqueue Deadlock Per Sec Oracle metric is the number of times per second that a process detected a potential deadlock when exchanging two buffers and raised an internal, restartable error.Ī deadlock can occur whenever multiple users are in a waiting pattern for data locked by each other. You may have to run the deadlock monitoring script below numerous times before you identify the transaction that is causing the problem. Log on as SYS or with SYSDBA authority and run this script in all databases.
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The query depends upon objects that are created by the script $ORACLE_HOME/rdbms/admin/dbmslock.sql. The following script can be used to identify deadlocks in the database. Transaction deadlocks occur when two or more transactions are attempting to access an object with incompatible lock modes. Remote resource requests are requests originating from another instance. The LMD process also handles deadlock detection Global Enqueue Service (GES) requests. Use smaller blocks with less data – Since the deadlock contention is at the block-level, consider moving these tables and indexes to a super-small blocksize (create a db2k_cache_size), and using a high PCTFREE to space-out the data over MORE blocks.Add INITRANS – In certain conditions, increasing INITRANS for the target tables and indexes(adding slots to the ITL) can relieve deadlocks.
#ORA 00060 DEADLOCK DETECTED WHILE WAITING FOR RESOURCE UPDATE#
Re-scheduling batch update jobs to low-update times an also help. Tune the application – Single-threading related updates and other application changes can often remove deadlocks.
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There are several remedies for resolving aborted tasks from deadlocks: See my notes here on resolving the deadlock detected error. To prevent a perpetual wait, Oracle aborts the transaction that caused the deadlock. If your ORA-00060 is caused by competing resources, the perpetual embrace happens when the aborted task (Task B) attempts to lock a row which is being held by another task (Task A), which, in-turn, is waiting for task B to release a lock. Retry if necessary.ĭeadlocks in Oracle result in this error: ORA-00060: deadlock detected while waiting for resourceĬause: Transactions deadlocked one another while waiting for resources.Īction: Look at the trace file to see the transactions and resources involved. This deadlock condition is an age-old issue known as the “perpetual embrace”! The doc note that a retry may work: Whenever you have competing DML running against the same data, you run the risk of a deadlock.