42 lines
1.9 KiB
SQL
42 lines
1.9 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) 1998-2011 Jeffrey M. Hunter. All rights reserved. |
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-- |----------------------------------------------------------------------------|
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-- | DATABASE : Oracle |
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-- | FILE : perf_hit_ratio_system.sql |
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-- | CLASS : Tuning |
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-- | PURPOSE : Reports buffer cache hit ratio. |
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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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SELECT
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TO_CHAR(SUM(DECODE(name, 'consistent gets', value, 0)),
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'999,999,999,999,999,999') con
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, TO_CHAR(SUM(DECODE(name, 'db block gets' , value, 0)),
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'999,999,999,999,999,999') dbblockgets
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, TO_CHAR(SUM(DECODE(name, 'physical reads' , value, 0)),
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'999,999,999,999,999,999') physrds
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, ROUND( ( (
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SUM(DECODE(name, 'consistent gets', Value,0))
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+
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SUM(DECODE(name, 'db block gets', value,0))
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-
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SUM(DECODE(name, 'physical reads', value,0))
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)
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/
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(
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SUM(DECODE(name, 'consistent gets', Value,0))
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+
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SUM(DECODE(name, 'db block gets', Value,0))
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)
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) *100,2
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) Hitratio
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FROM v$sysstat
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/
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