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idev/perf_hit_ratio_system.sql Normal file
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-- +----------------------------------------------------------------------------+
-- | Jeffrey M. Hunter |
-- | jhunter@idevelopment.info |
-- | www.idevelopment.info |
-- |----------------------------------------------------------------------------|
-- | Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved. |
-- |----------------------------------------------------------------------------|
-- | DATABASE : Oracle |
-- | FILE : perf_hit_ratio_system.sql |
-- | CLASS : Tuning |
-- | PURPOSE : Reports buffer cache hit ratio. |
-- | NOTE : As with any code, ensure to test this script in a development |
-- | environment before attempting to run it in production. |
-- +----------------------------------------------------------------------------+
SELECT
TO_CHAR(SUM(DECODE(name, 'consistent gets', value, 0)),
'999,999,999,999,999,999') con
, TO_CHAR(SUM(DECODE(name, 'db block gets' , value, 0)),
'999,999,999,999,999,999') dbblockgets
, TO_CHAR(SUM(DECODE(name, 'physical reads' , value, 0)),
'999,999,999,999,999,999') physrds
, ROUND( ( (
SUM(DECODE(name, 'consistent gets', Value,0))
+
SUM(DECODE(name, 'db block gets', value,0))
-
SUM(DECODE(name, 'physical reads', value,0))
)
/
(
SUM(DECODE(name, 'consistent gets', Value,0))
+
SUM(DECODE(name, 'db block gets', Value,0))
)
) *100,2
) Hitratio
FROM v$sysstat
/