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Oracle Tips by Burleson 

Digging in to cause of slowness

ash_top_10.sql is a query of v$active_session_history joined with dba_users to get username and v$sql to obtain the SQL statement.  Figure 9.5 shows some of the records from a sample system.  

* ash_top_10.sql 

-- *************************************************

-- Copyright © 2003 by Rampant TechPress

-- This script is free for non-commercial purposes

-- with no warranties.  Use at your own risk.

--

-- To license this script for a commercial purpose,

-- contact rtp AT rampant.cc

-- *************************************************

/* ash_top_10.sql */

column sql_text format a120 WRAP

column session_id form 9999 head SID

column session_serial# form 9999 head SERIAL#

column sql_text format a120 WRAP

column sample_time format a10

column username format a10

column session_state format a10 head SESSION|STATE

column event format a30

column p1 format 999999999

column p2 format 9999999

column p3 format 9999999

select

   trunc(SAMPLE_TIME),

   SESSION_ID,

   SESSION_SERIAL#,

   USERNAME,

   EVENT,

   P1,

   P2,

   P3,

   WAIT_TIME,

   TIME_WAITED,

   SESSION_STATE,

   SQL_TEXT

from

   v$active_session_history a,

   dba_users b,

   v$sql c

where:

See Code Depot


The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Iinterface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert 

http://www.rampant-books.com/book_2004_2_wait_tuning.htm

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