Oracle, Web, Script, SQLserver, Tips & Trick

December 16, 2011

Library Cache Get hit Ratio

Filed under: oracle — sikathabis @ 7:40 am
Tags: ,

SELECT ‘Buffer Cache’ NAME,
ROUND ( (congets.VALUE + dbgets.VALUE – physreads.VALUE)
* 100
/ (congets.VALUE + dbgets.VALUE),
2
) VALUE
FROM v$sysstat congets, v$sysstat dbgets, v$sysstat physreads
WHERE congets.NAME = ‘consistent gets’
AND dbgets.NAME = ‘db block gets’
AND physreads.NAME = ‘physical reads’
UNION ALL
SELECT ‘Execute/NoParse’,
DECODE (SIGN (ROUND ( (ec.VALUE – pc.VALUE)
* 100
/ DECODE (ec.VALUE, 0, 1, ec.VALUE),
2
)
),
-1, 0,
ROUND ( (ec.VALUE – pc.VALUE)
* 100
/ DECODE (ec.VALUE, 0, 1, ec.VALUE),
2
)
)
FROM v$sysstat ec, v$sysstat pc
WHERE ec.NAME = ‘execute count’
AND pc.NAME IN (‘parse count’, ‘parse count (total)’)
UNION ALL
SELECT ‘Memory Sort’,
ROUND ( ms.VALUE
/ DECODE ((ds.VALUE + ms.VALUE), 0, 1, (ds.VALUE + ms.VALUE))
* 100,
2
)
FROM v$sysstat ds, v$sysstat ms
WHERE ms.NAME = ‘sorts (memory)’ AND ds.NAME = ‘sorts (disk)’
UNION ALL
SELECT ‘SQL Area get hitrate’, ROUND (gethitratio * 100, 2)
FROM v$librarycache
WHERE namespace = ‘SQL AREA’
UNION ALL
SELECT ‘Avg Latch Hit (No Miss)’,
ROUND ((SUM (gets) – SUM (misses)) * 100 / SUM (gets), 2)
FROM v$latch
UNION ALL
SELECT ‘Avg Latch Hit (No Sleep)’,
ROUND ((SUM (gets) – SUM (sleeps)) * 100 / SUM (gets), 2)
FROM v$latch;

result for example:

NAME VALUE
Buffer Cache 99.89
Execute/NoParse 99
Memory Sort 100
SQL Area get hitrate 62.37
Avg Latch Hit (No Miss) 99.99
Avg Latch Hit (No Sleep) 100

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