51 lines
2.4 KiB
MySQL
51 lines
2.4 KiB
MySQL
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-- +----------------------------------------------------------------------------+
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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) 1998-2011 Jeffrey M. Hunter. All rights reserved. |
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-- |----------------------------------------------------------------------------|
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-- | DATABASE : Oracle |
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-- | FILE : perf_top_sql_by_disk_reads.sql |
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-- | CLASS : Tuning |
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-- | PURPOSE : Report on top SQL statements ordered by disk reads. |
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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 LINESIZE 145
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SET PAGESIZE 9999
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SET VERIFY off
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COLUMN username FORMAT a18 HEADING 'Username'
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COLUMN disk_reads FORMAT 999,999,999,999,999 HEADING 'Disk Reads'
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COLUMN executions FORMAT 999,999,999,999,999 HEADING 'Executions'
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COLUMN reads_per_exec FORMAT 999,999,999,999,999 HEADING 'Reads / Executions'
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COLUMN sql HEADING 'SQL Statement'
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BREAK ON report
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COMPUTE sum OF disk_reads ON report
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COMPUTE sum OF executions ON report
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COMPUTE sum OF reads_per_exec ON report
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prompt
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prompt =============================================
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prompt SQL with disk reads greater than 1000
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prompt =============================================
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SELECT
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UPPER(b.username) username
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, a.disk_reads disk_reads
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, a.executions executions
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, a.disk_reads / decode(a.executions, 0, 1, a.executions) reads_per_exec
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, sql_text || chr(10) || chr(10) sql
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FROM
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sys.v_$sqlarea a
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, dba_users b
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WHERE
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a.parsing_user_id = b.user_id
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AND a.disk_reads > 1000
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AND b.username NOT IN ('SYS','SYSTEM')
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ORDER BY
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disk_reads desc;
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