RE: db_file_multiblock_read_count causing full scans to takelonger?
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <Rich.Jesse@xxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 20 Dec 2006 14:14:11 -0700
Do you have sga_target set? If so, then db_cache_size is just a
minimum. What are the results if you run this instead:
SELECT LEAST(dcs/(ses*dbs), 1048576/dbs) "CALC", dfmbrc FROM (
SELECT b.value "SES", c.value "DBS", d.value "DFMBRC"
FROM v$parameter a, v$parameter b, v$parameter c, v$parameter d
WHERE a.name = 'db_cache_size'
AND b.name = 'sessions'
AND c.name = 'db_block_size'
AND d.name = 'db_file_multiblock_read_count'),
(SELECT bytes "DCS" from v$sgastat where name = 'buffer_cache');
Thanks,
Brandon
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