As of Oracle 8.1.7, there is a separate direct read I/O wait event for LOB segments - direct path read (lob). Oracle Wait Events - db file sequential read - Toad Be careful, this view is part of the diagnostic pack, you should not query this view if you not licensed for it. Once you fix the problem by adding the foreign key constraint to the relevant table, the enq: TM - contention event will go away. * from (SELECT v.sid,sess.Serial# ,program, v.value / (100 * 60) CPUMins This type of TX enqueue wait corresponds to the wait event enq: TX - row lock contention.To solve this again you have the first session already holding the lock perform a COMMIT or ROLLBACK. The User process charges this wait time as a 'log file sync' event. . This is Bug 11800170 - ASM IN KSV WAIT AFTER APPLICATION OF 11.2.0.2 GRID PSU. Whenever you see an enqueue wait event for the TX enqueue, the first step is to find out who the blocker is and if there are multiple waiters for the same resource by using the following query. Oracle Wait Events - direct path read - Toad SQL> insert into b2 values (1); 1 row created. •1:30 p.m. - Oracle Enterprise Manager Configuration Management Unleashed: Top 10 Expert Tips •Marriott Marquis, Salon 6 •1:30 p.m. - Oracle Enterprise Manager Security Best Practices •Moscone S. Room 102 •3:00 p.m - The X-Files: Managing the Oracle Exadata and Highly Available Oracle Databases •Moscone S. Room 102 O racle Database Wait Events I will describe some of the wait events that cause performance problems in Oracle Databases. TO find out sql_id for the above sid: . Example In this case, it is 2-node RAC (problem could happen for multiple nodes) with high gc wait events reported and performance is slow intermittently for both instances: There is no workload change or major application change during this time period. CPU usage is described by "CPU time" (or "DB CPU") statistics. col event head "Waited for" format a30. How to find the waitevent History of the Oracle session The window can be also viewed by choosing the operator then clicking F4. To reiterate, buffer busy waits are prevalent in I/O-bound systems with high DML updates. The following screenshot shows the Database Load section and Top SQL tab. Drilling & Solution: The "cache buffer chain" latch wait is normal, but high values are associated with high simultaneous buffer access, similar to a free-list shortage on an index or table segment header. Top 10 queries from v$active_session_history | Oracle DBA Montreal SQL Server Wait Events: Taking the Guesswork out of ... - Simple Talk For such a query execution, we find that Oracle will need: 126 (128+1) * 4 -> 128 (129) * 4 -> 16512 * 4 -> 66048. For the previous example, the appropriate data to check would be latch-related. — Query 4:For Checking the last run of concurrent Program. […] Oracle RAC Wait Events— Monitoring an Oracle RAC database often means monitoring this situation and the amount of requests going back and forth over the RAC interconnect.

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