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Oracle Tips by Burleson

Monitoring Locks and Latches

Monitoring latches and locks can be a challenge in Oracle. Just for V$LOCK DPT alone, multiple joins are usually required to get to the information you desire. I suggest running the CATBLOCK.SQL script, as it creates several useful views for locks. The CATBLOCK.SQL script is located in the /oracle/rdbms/admin directory on UNIX, and in the c:\orant\rdbmsxx\admin directory on NT. The script creates DBA_KGLLOCK, DBA_LOCK, DBA_LOCK_INTERNAL, DBA_DML_LOCKS, DBA_DDL_LOCKS, DBA_WAITERS, and DBA_BLOCKERS. I suggest executing this script with echo set to ON, since in many releases it contains errors that you must correct before it will run properly. On early Oracle7 releases, there were also problems with permissions on some of the lock views, which required that they be queried from SYS or INTERNAL only. OEM contains a detailed lock screen in the GUI, as well as an HTML-based report for locking.

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