wait events and v$session

From: <ryan.gaffuri_at_cox.net>
Date: Tue, 11 May 2004 10:32:48 -0400
Message-Id: <20040511143248.MSFE18696.lakermmtao10.cox.net@smtp.central.cox.net>

I have one batch process running and there are alot of waits. I thought waits were caused by concurrency?

If this is unreadable, please ignore. Hard to format with web email. Basically, I have large waits for DB_FILE_SCATTERED_READ, DB_FILE_SEQUENTIAL_READ, and for RAC Cache Fusion due to the load balancing.

     SID EVENT                          TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT   MAX_WAIT TIME_WAITED_MICRO


---------- ------------------------------ ----------- -------------- ----------- ------------ ---------- -----------------

        22 rdbms ipc reply                          1              0           0            0          0               165
        22 log file sync                            1              0           0            0          0               996
        22 db file sequential read             491250              0       23237            0        172         232371459
        22 db file scattered read              159243              0       29892            0         37         298924960
        22 global cache open x                     10              0           0            0          0              3380
        22 global cache s to x                  11273              0         648            0         42           6477337
        22 global cache cr request            1453244             16      233740            0         98        2337401155
        22 row cache lock                         210              0          14            0          0            135414
        22 library cache lock                      15              0           1            0          0              5311
        22 SQL*Net message to client               21              0           0            0          0                27
        22 SQL*Net message from client             21              0           1            0          0              9023




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Received on Tue May 11 2004 - 09:45:25 CDT

wait events and v$session_event