"latch: cache buffers chains" wait in NON-RAC Benchmark Runs

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Fri, 15 Feb 2008 07:43:14 +0530
Message-ID: <69E1360E54B50C4A828A136C158E4742036A707765@BLRKECMBX02.ad.infosys.com>


In a Benchmark Run, 512 concurrent BATCH Processes using Dedicated Sessions (NON-MTS) showing the following Waits:-

How is the "latch: cache buffers chains" wait to be addressed?

Should "_write_clones" be set to "0"
Current default value is "3"

Will share the Statspack Report, as needed.

Oracle ( NON-RAC )
Solaris 10



Statspack Report :-

   Elapsed: 19.23 (mins)

Top 5 Timed Events                                                    Avg %Total
~~~~~~~~~~~~~~~~~~                                                   wait   Call
Event                                            Waits    Time (s)   (ms)   Time
----------------------------------------- ------------ ----------- ------ ------
CPU time                                                    28,932          27.2
latch: cache buffers chains                    379,062      18,092     48   17.0
db file scattered read                         134,021      17,649    132   16.6
db file sequential read                        155,494      13,199     85   12.4
SQL*Net break/reset to client                4,314,656      10,430      2    9.8
^LHost CPU  (CPUs: 120)
~~~~~~~~              Load Average
                      Begin     End      User  System    Idle     WIO     WCPU
                    ------- -------   ------- ------- ------- ------- --------
                                    1.55    6.65
                                   40.30   30.85   28.84    0.00   77.42

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Received on Thu Feb 14 2008 - 20:13:14 CST

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