Database Tuning (MOSC)

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db file sequential read

edited Jun 3, 2014 9:44AM in Database Tuning (MOSC) 4 commentsAnswered ✓

Hi all,

on 11.2.0.3 , I ran AWRRPT and I have this :

          Snap Id  Snap Time  Sessions Curs/Sess
        --------- ------------------- -------- ---------
Begin Snap: 22153 27-May-14 13:30:13    60   2.3
  End Snap: 22154 27-May-14 14:00:20    60   2.3
   Elapsed:           30.12 (mins)
   DB Time:            1.25 (mins)

Top 5 Timed Foreground Events

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

                                                       Avg
                                                      wait   % DB
Event                             Waits Time(s)   (ms)   time Wait Class

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

DB CPU                                           41      54.8
direct path read                  2,941      11  4   15.0 User I/O
db file sequential read           4,969      11  2   14.8 User I/O
db file scattered read              550       9 16   11.7 User I/O
Disk file operations I/O          1,292       2  12.4 User I/O

I want to find the file that has db file sequential read problem. Then I run the following but nothing :

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