RE: Find out how often SQL is run

From: D'Hooge Freek <Freek.DHooge_at_uptime.be>
Date: Thu, 18 Feb 2010 10:17:44 +0100
Message-ID: <4814386347E41145AAE79139EAA398980DC818CD72_at_ws03-exch07.iconos.be>

Hi,

You can find this information in the awr tables. The execution times and such will be averages for the executions between the 2 snapshots.

set linesize 120
set pages 999
column avg_elapsed_sec format 99999D99
column disk_reads format 999999999
column buffer_gets format 999999999

select to_char(snap.begin_interval_time, 'DD/MM/YYYY HH24:MI:SS') btime,

       to_char(snap.end_interval_time, 'DD/MM/YYYY HH24:MI:SS') etime, snap.snap_id, 
       snap.instance_number, sqlstat.executions_delta nbr_executions, 


       (sqlstat.elapsed_time_delta / sqlstat.executions_delta/1000000) avg_elapsed_sec,

       (sqlstat.disk_reads_delta / sqlstat.executions_delta) disk_reads, 

       (sqlstat.buffer_gets_delta / sqlstat.executions_delta) buffer_gets

from dba_hist_snapshot snap, dba_hist_sqlstat sqlstat where snap.snap_id = sqlstat.snap_id(+)

      and snap.instance_number = sqlstat.instance_number(+)
      and sql_id = '&sql_id'

order by snap.snap_id, snap.instance_number;

Note that you are only allowed to access the awr tables when you have licensed the diagnostic pack. Which is not available for Standard Edition, although the tables are there and awr snapshots are enabled by default (and no, I don't know what the guys at Oracle where smoking when they came up with this rule).

Regards,  

Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge_at_uptime.be
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ingrid Voigt Sent: woensdag 17 februari 2010 21:02
To: Oracle-l_at_freelists.org
Subject: Find out how often SQL is run

Hi,

I need to find out how often a particular query (identified by SQL id) is run. If possible also how long executions take and if the execution plan varies. Database version is 10.2.0.4 Standard Edition on Windows.

Do I have to schedule a job to query v$sqlarea regularly? Or is there something better (Statspack?)

Thanks for your help.

Regards
Ingrid Voigt

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Received on Thu Feb 18 2010 - 03:17:44 CST