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The V$LOCK and the V$LOCK_HOLDERS views are very helpful in analyzing locks in your instance, but sometimes they take a long time to run. The V$SESSION view can provide a quick idea about the blocking sessions in your database. The blocking_session column of the V$SESSION view reveals the identity of the user who is holding the lock. The blocking_session_status column shows whether the blocking_session data is valid or not. For example, if you find the value VALID in the blocking_session_status column, it means that you ll find the SID of the blocking user under the blocking_session column. Here s a simple query that shows how to use the V$SESSION view to find out who is blocking a certain session: SQL> SELECT sid, blocking_session, username, event 2 FROM v$session 3* WHERE blocking_session_status = 'VALID'; SID BLOCKING_SESSION --- ---------------24 32 SQL> USERNAME -------SALAPATI EVENT ---------------------------------enq: TX - row lock contention

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The previous query shows that the user with the SID 24 is being blocked by user with the SID 32. The event column shows the type of lock that the blocking session holds.

The data dictionary tables that you need to look at to find locking information are the DBA_LOCKS, DBA_BLOCKERS, and DBA_WAITERS views. If, for some reason, you don t see the DBA_BLOCKERS view, run the catblock.sql script, located in the $ORACLE_HOME/rdbms/admin directory, to create it.

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The most efficient way to see what locks currently exist within your instance is to use the Oracle Enterprise Manager (OEM) Database Control (or Grid Control). You can get to this page by going to Database Control Home Page Performance Additional Monitoring Links Instance Locks. The Instance Locks page shows all locks, both blocking and nonblocking. Most of the locks you ll see are harmless; they are routine nonblocking locks Oracle uses to maintain concurrency. To see locks that are causing contention in your system, choose the Blocking Sessions option from the drop-down list in the Instance Locks page. The Blocking Session page will show you all the sessions that are currently blocking other sessions. You can also go directly to the Blocking Sessions page by going to Database Control Home Page Performance Additional Monitoring Links Blocking Sessions. The Blocking Sessions page shows the session IDs of both the blocking and the blocked sessions (see Figure 6-1). You can terminate a blocking session by selecting the appropriate session and clicking the Kill Session button. Figure 6-1 shows that the user nick_alapati is holding an exclusive lock (on a certain row in the test01 table, which you can t see in the figure), thereby blocking the user nina_alapati from getting an exclusive lock on the same row. The blocking session is identified by a value of 1 or greater under the Sessions Blocked column on the Blocking Sessions page (see Figure 8-1). The session that s being blocked is indicated by a value of zero.

Figure 8-1. Using the Database Control to identify blocking and waiting sessions You can also use OEM s Hang Analysis page (go to Database Control Home Page Performance Additional Monitoring Links Hang Analysis) to find out the exact wait status of the blocking and waiting sessions. The Hang Analysis page will show you the following: Instantaneously blocked sessions Sessions in a prolonged wait state Sessions that are hung When there is a severe contention for locks in the instance, the Hang Analysis page will help you identify the problems much more quickly than running a SQL script, which might actually worsen the locking problems.

Be prepared to wait for a very long time when you run most of the SQL scripts that relate to locking situations. Also, be aware that some of the scripts might sometimes make matters worse. The utllockt.sql script, for example, creates a table to store locking information, and it needs to acquire locks to create this table, which might exacerbate the locking problems that you are trying to diagnose in the first place! It s smarter to schedule these scripts using a scheduling tool or the Oracle Enterprise Manager and arrange for database alerts when there are problem locks in the system, so you can take action to fix the problem.

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