72 lines
2.6 KiB
SQL
72 lines
2.6 KiB
SQL
-- +----------------------------------------------------------------------------+
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-- | Jeffrey M. Hunter |
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-- | jhunter@idevelopment.info |
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-- | www.idevelopment.info |
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-- |----------------------------------------------------------------------------|
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-- | Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved. |
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-- |----------------------------------------------------------------------------|
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-- | DATABASE : Oracle |
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-- | FILE : undo_contention.sql |
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-- | CLASS : Undo Segments |
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-- | PURPOSE : Undo contention report. This script is RAC enabled. |
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-- | NOTE : As with any code, ensure to test this script in a development |
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-- | environment before attempting to run it in production. |
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-- +----------------------------------------------------------------------------+
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SET TERMOUT OFF;
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COLUMN current_instance NEW_VALUE current_instance NOPRINT;
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SELECT rpad(instance_name, 17) current_instance FROM v$instance;
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SET TERMOUT ON;
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PROMPT
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PROMPT +------------------------------------------------------------------------+
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PROMPT | Report : Undo Contention |
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PROMPT | Instance : ¤t_instance |
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PROMPT +------------------------------------------------------------------------+
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SET ECHO OFF
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SET FEEDBACK 6
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SET HEADING ON
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SET LINESIZE 180
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SET PAGESIZE 50000
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SET TERMOUT ON
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SET TIMING OFF
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SET TRIMOUT ON
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SET TRIMSPOOL ON
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SET VERIFY OFF
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CLEAR COLUMNS
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CLEAR BREAKS
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CLEAR COMPUTES
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COLUMN instance_name FORMAT a10 HEAD 'Instance'
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COLUMN class FORMAT a18 HEADING 'Class'
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COLUMN ratio HEADING 'Wait Ratio'
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BREAK ON instance_name SKIP 2
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SELECT
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i.instance_name instance_name
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, w.class class
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, ROUND(100*(w.count/SUM(s.value)),8) ratio
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FROM
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gv$instance i
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, gv$waitstat w
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, gv$sysstat s
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WHERE
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i.inst_id = w.inst_id
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AND i.inst_id = s.inst_id
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AND w.class IN ( 'system undo header'
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, 'system undo block'
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, 'undo header'
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, 'undo block'
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)
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AND s.name IN ('db block gets', 'consistent gets')
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GROUP BY
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i.instance_name
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, w.class
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, w.count
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ORDER BY
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i.instance_name
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, w.class;
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