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Don Burleson Blog 









Oracle 10g ASH views v$session_event

by Donald Burleson

It will be useful to look at examples of how the v$session_event view might be used in real life. In this example, end users have started complaining that they recently started to experience large delays when running a production application.

In some ERP applications (Oracle Applications, SAP), a single user account is used to connect to the database. In these cases, the DBA can issue the following statement to determine the particular event application for which the sessions are waiting:

<        session_waits.sql

   sum(se.time_waited/100) time_waited
   v$session_event se,
   v$session       sess
   sess.username = 'SAPR3'
   sess.sid = se.sid
group by
order by 2 DESC;



The output of this script might look like the following:

                  Waits for user SAPR3
                               SUM   SUM         TIME
EVENT                         WAITS  TIMEOUTS    WAITED
---------------------------  ------- ---------   -----
SQL*Net message to client      7,824   0         .06
SQL*Net message from client    7,812   0  312,969.73
db file sequential read        3,199   0       16.23
SQL*Net more data to client      590   0         .08
SQL*Net break/reset to client    418   0          .2
direct path read                 328   0         .01
SQL*Net more data from client     78   0        3.29
latch free                        62  10         .08
db file scattered read            56   0         .75
log file sync                     47   0         .96
direct path write                 32   0          .4
file open                         32   0           0
library cache pin                 13   0           0
log file switch completion         3   0         .53

From the listing above, the DBA can conclude that end users spend most of their wait time waiting on the event SQL*Net message from client. This may indicate that there is some network-related issue causing clients too much wait time to send data to the database server. 



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