Set 'MONITORING' on for that tabel and indexes.
Gather stats for only maybe 20% rows.
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Bad statistics, bad execution plan - prevention?
I have a table with 8.8 million rows. This is a relatively key table that gets queried or updated with nearly every transaction.
Every once in a while (about every 60 to 90 days) the nightly process that recalculates statistics causes a problem on this table. Which in turn causes serioud performance issues in the application.
A simple recalculation of the statistics resolves the problem when it happens. But that recalculation takes about 30 minutes.
I would like to prevent this issue from happening -- or at least reduce the occurances. Does anyone have any tips or hints on how to mitigate this issue?
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by: sdstuberPosted on 2009-09-23 at 11:50:11ID: 25406511
get good statistics once and then lock them....
dbms_stats.lock_table_stat
or, export the statistics each day and if you ever have a bad run, rather than recalculate them all just reimport the previous day's stats or however many days you need to go back to get a good set.
also, I recommend trying to determine what happens to the data every 2 or 3 months that is so radically different that is skews the statistics