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Deadlocks occur in any RDBMS when two sessions block each other while each waits for a resource that the other session is holding. This is a catch-22 situation, because the stalemate can t be broken by either session unilaterally. In such circumstances, Oracle steps in, terminates one of the sessions, and rolls back its statement. Oracle quickly recognizes that two sessions are deadlocked and terminates the session that issued the most recent request for a lock. This will release the object locks that the other session is waiting for. You don t really need to do anything when there are deadlocks, although you ll see messages in your dump directory that deadlocks are currently in the database. When Oracle encounters a deadlock between transactions, it records in the trace file the session IDs involved, the SQL statements issued in the transactions, and the specific object name and the rows on which locks are held in each session involved in the deadlock. Oracle further informs you that the deadlock is not an Oracle error, but is due to errors in application design or is a result of issuing ad hoc SQL. Application designers must write exception handlers in the code to roll back the aborted transaction and restart it. You can avoid deadlocks by paying attention in the design phase and ensuring the proper locking order of the objects. Given that writers block other writers, deadlocks in Oracle are a rare phenomenon.
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Managing Oracle Locks
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As I mentioned in the previous sections, locking in Oracle is usually done implicitly by Oracle itself, at the least restrictive level. Users can override Oracle s default locking behavior, but you probably won t find too many cases where you re dealing with user-managed locks. Most of your lock management on a live database will involve checking whether any active locks are actually blocking users from conducting their DML operations. You can use either a script-based approach or the Oracle Enterprise Manager to analyze locks in your instance.
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It s possible to examine the current locking situation in your instance by using SQL scripts. You may have to first run the catblock.sql script, located in the $ORACLE_HOME/rdbms/admin directory, before executing any locking-related SQL scripts for the first time in a database. This script will create several important locking-related views, such as DBA_LOCKS, DBA_WAITERS, and DBA_BLOCKERS. Oracle provides a script called utllockt.sql that gives you a lock wait-for graph in a tree-structured format showing sessions that are holding locks affecting other sessions. Using this script, you can see what locks a session may be waiting for and which session is holding the lock. The script is located in the $ORACLE_HOME/rdbms/admin directory. Here s a sample execution of the utllockt.sql script: SQL> @$ORACLE_HOME/rdbmsa/admin/utllockt.sql Waiting session Type Mode requested --------------- ----------------682 None None 363 TX Share (S) Mode Held ------------None Exclusive (X) Lock Id1 --------0
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Note The utllockt.sql script prints the sessions in the system that are waiting for locks, and the locks that they are waiting for. The printout is tree-structured. If a session ID is printed immediately below and to the right of another session, then it is waiting for that session. The session IDs printed at the left side of the page are the sessions everyone is waiting for.
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In the preceding example, the session ID on the left side, 682, is what session 363 is waiting for. The information printed to the right of each session shows information about the lock it s waiting for. Thus, session 682, although it s holding a lock, doesn t show anything (None) in the lock-information columns because it isn t waiting for any lock. Session 363, however, tells you that it has requested a share (S) lock and is waiting for session 682 to release its exclusive (X) lock on the table row. In the following example from the utllockt.sql script, session 9 is waiting for session 8, session 7 is waiting for session 9, and session 10 is waiting for session 9 as well. * WAITING SESSION * ----------------* 8 * 9 * 7 * 10 TYPE ---NONE TX RW RW MODE REQUESTED ----------------None Share (S) Exclusive (X) Exclusive (X) MODE HELD ----------------None Exclusive (X) S/Row-X (SSX) S/Row-X (SSX) LOCK ID1 LOCK ID2 -------- -------0 0 65547 16 33554440 2 33554440 2
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The lock information to the right of the session ID describes the lock that the session is waiting for (not the lock it is holding).
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