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The query gives Date, Event_Name and Total_Waits. In this system there are 119 Idle wait events, so all the rest would be classified as non-idle wait events. If a session is not active it will not be sampled. In this case, ask the user to commit or roll back the transaction. Oracle Database RAC Diagnostics and Tuning This event occurs when Oracle Instance query data from the Datafiles asynchronously and puts this data into PGA instead of Buffer Cache in SGA. SQL Performance issues basic Troubleshooting Stpes - Blogger The top wait events identify the next places to investigate. 2 ) There are 32 cpu and each one is 8 core. ARCH wait on SENDREQ: This wait event is the total time taken by the Archiver Processes to archive the Standby in the Dataguard and to write these archives to the local disks. But If Network, Commit,Concurrency and etc. 5 Oracle Performance Tuning Tips for Optimized Performance - Database ... The User process charges this wait time as a 'log file sync' event. OCP Oracle DBA in Montreal at Desjardins This query returns the top 5 wait events for the last hour from the v$active_session_history view. 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. The performance page or top activity may show high I/O waits but it won't indicated if the latency of I/O is unusually high . Important Statistics & Wait Events on Exadata - Uwe Hesse Oracle Wait Events - direct path read - Toad Wait for stopper event to be increased | Oracle Blog : Real Problems ... Cursor: Pin S Wait on X in the Top 5 Wait Events - Pythian Blog Now Oracle is allocating 66,048 message buffers, a large number, indeed. 2 mname varchar2 (200); 3 begin. In SQL Server 2000 and before, this was done via the UMS, the User Mode Scheduler. 4 select cc into mname from a2 join b2 on a2.id1=b2.id1 where a2.id1=1; 5 dbms_lock.sleep (3000); -- SUPPOSE THAT TEST1 TAKES 3000 SECONDS TO FINISH RUNNING. I/O contention is sometimes the result of waiting for access to data blocks and can be caused by multiple Oracle tasks repeatedly reading the same blocks, as when many Oracle sessions scan the same index.