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understanding statspack report

edited Jul 13, 2010 8:49AM in Database Tuning (MOSC) 13 commentsAnswered
 Instance Efficiency Percentages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            Buffer Nowait %:  100.00                          Redo NoWait %:   99.93
            Buffer  Hit   %:   12.77                                In-memory Sort %:  100.00
            Library Hit   %:   81.20                               Soft Parse %:   90.69
         Execute to Parse %:   20.14                        Latch Hit %:   99.98
Parse CPU to Parse Elapsd %:   65.97%           Non-Parse CPU:   98.59

 Shared Pool Statistics        Begin   End
                               ------  ------
             Memory Usage %:   91.91   92.40
    % SQL with executions>1:   67.98   71.23
  % Memory for SQL w/exec>1:   70.17   73.94

Top 5 Timed Events                                                    Avg %              Total
~~~~~~~~~~~~~~~~~~                                                wait                  Call
Event                                            Waits    Time (s)      (ms)                Time
----------------------------------------- ------------ ----------- ------ ------
db file scattered read                  188,614         171      1                    57.8
CPU time                                                               67                              22.7
db file sequential read                          9,144          55         6                18.5
log file sequential read                            23           1            34                  .3
control file sequential read                     1,022           1         1                    .3

Statistic                                       Time (s) % of DB time
----------------------------------- -------------------- ------------
sql execute elapsed time                           275.4         99.6
DB CPU                                              67.8         24.5
PL/SQL execution elapsed time                       47.2         17.1

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