dcsimg

Buffer Hit Ratio

November 7, 2003



>>Script Language and Platform: Oracle 9i
Oracle9i Buffer Hit Ratio

Author: Prasad Mahale


SELECT A.VALUE + B.VALUE "Logical Reads",
C.VALUE "Physical Reads",
ROUND(100 * ((A.VALUE+B.VALUE)-C.VALUE) /
(A.VALUE+B.VALUE)) "Buffer Hit Ratio %"
FROM V$SYSSTAT A,
V$SYSSTAT B,
V$SYSSTAT C
WHERE A.STATISTIC# = 41 --Consistent Gets--
AND B.STATISTIC# = 40 --Db Block Gets--
AND C.STATISTIC# = 42 --Physical Reads--

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