How to calculate #Buffer Gets # Exec Buffer Gets/Exec
Hi,
How to calculate #Buffer Gets,# Execution time,Buffer Gets/Exec for a sql query?
Nirmal
You can find out these statistics from two places
1) using SQL_TRACE (10046 trace) and then TKPROF (or Autotrace in SQL*Plus)
2) or looking at V$SQL which records the cost assigned to each SQL statement since the statement was first cached.
If you use Statspack or AWR, you can see the difference between two points in time, so you can calculate the cost for a period of time.
See Using SQL_Trace and TKPROF
http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96533/sqltrace.htm#1018
and Using Statspack
http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96533/statspac.htm#34837
(see the 10g documentation equivalents if necessary).
Remember, ratios (eg gets/exec) aren't always very helpful. You're best off concentrating on those operations which take longest (ie where there is the most potential to save time). See (eg) www.hotsos.com, www.oraperf.com, and others to identify effective performance methodologies.
HTH
Regards Nigel
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