Ok, good info, but which values best impact oracle select query performance?
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Oracle Performance Statistics - Select Query for CPU, Memory, Cache, Etc
I'm trying to measure the performance of an application that heavily relies on an Oracle 9i database. I capture the time it takes to accomplish certain application specific routines and I would also like to capture some key oracle metrics at the same time. Is there a system table that I can query that will return things like CPU/disk/memory/cache utilization and/or anything else that may affect database performance? Thanks.
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Answers
I always start with "consistent gets" that's the number of io operations that have to be performed, that io "might" involve trips to the cach, it "might" involve physical io. Reduce it and you will reduce your io regardless of where it reads from.
Other things to consider are recursive calls, sorts, db block gets and physical reads (the latter two I look at after consistent gets have been reduced)
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by: sdstuberPosted on 2009-01-21 at 07:27:24ID: 23430555
-- to get statistics for all sessions
SELECT s.sid, n.name, s.VALUE
FROM v$sesstat s, v$statname n
WHERE s.statistic# = n.statistic#;
-- to get statistics for your current session
SELECT s.sid, n.name, s.VALUE
FROM v$mystat s, v$statname n
WHERE s.statistic# = n.statistic#;
-- to get overall system statistics
SELECT n.name, s.VALUE
FROM v$sysstat s, v$statname n
WHERE s.statistic# = n.statistic#;