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Home -> Community -> Mailing Lists -> Oracle-L -> Re: rebuilding indexes - sure to cause a ruckus
There's no point of arguing about whether a query ran faster right after you
rebuilt your index. Nor there is no point in finding some ultimate algorithm
for finding the point of index rebuilding, we all know the answer - it's
"42".
Instead, a long stress test has to be done, e.g. running 10 millions of continous transactions and queries (simulating real life). Do one 10M without rebuilding indexes in the meantime, measure total execution time, IO amount, CPU usage, segment sizes etc.
Then restore your database back to starting point and do the same test again with regular index rebuilds during the operations (online or taking "users" offline, depending on environment type). And then measure the same statistics, especially total execution time. Note, that statistics and time also for rebuilding indexes should be accounted in totals, because in real life they don't just disappear somewhere as in some simple-minded tests.
Tanel.
http://www.dbazine.com/burleson18.shtml
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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Tanel Poder
INET: tanel.poder.003_at_mail.ee
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Thu Dec 04 2003 - 15:04:26 CST
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