%1-3 values are not big problem for following wait events. High "gc cr grant 2-way" / "gc current block 2-way" Wait due ... - Oracle The enq: TM - contention event is usually due to missing foreign key constraints on a table that's part of an Oracle DML operation. In this case, ask the user to commit or roll back the transaction. This is Bug 11800170 - ASM IN KSV WAIT AFTER APPLICATION OF 11.2.0.2 GRID PSU. The Oracle Wait Interface, which was introduced many versions ago, has been a great jump-start for admins who know how to use it, but even it has lacked the ideal ability to tell a DBA how well the system or user sessions have efficiently processed transactions or queries. You can find the top 5 wait events in the AWR reports. log file sync: If this event is in the top 5, you are committing too often (talk to your developers) log file parallel write: deals with flushing out the redo log buffer to disk. This type of event usually occurs during the use of Temporary ( Temp ) Tablespace in the Sorting operations, during the creation of Lob segments, and when multiple sessions Full table scan in parallel. Solution for wait event " Read by other session" | orasolution You can see the current wait class waits by querying the v$system_wait_class view as seen in this example: S QL> Select wait_class, sum (time_waited), sum (time_waited)/sum (total_waits) 2 Sum_Waits 3 From v$system_wait_class see code depot for full script 4 Group by wait_class 5 Order by 3 desc; WAIT_CLASS SUM (time_waited) SUM_WAITS SQL> insert into b2 values (1); 1 row created. It may happen that one database is consuming more server resources than others. The data is held in a buffer in memory in the database.The design goal is to keep about an hour (your mileage will vary). Moreover, many wait events might not get reported if the wait event occurred and disappeared between two snapshots. Oracle - A query to get the "Wait Events" part of the AWR report. Find top CPU Consuming Session or SQLs query in Oracle. Oracle Wait Events - direct path read - Toad SQL Tracing with wait events of a database session shows it is limited mainly by I/O wait events. The window can be also viewed by choosing the operator then clicking F4. SQL Top wait col c1 heading 'Average Waits for|Full scan Read I/O' format 9999.99 .
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