We've upgraded to 9.2.0.4 on one of our high volume databases. As usual everything was fine in dev and test but high volume queries have started to break .
one of the problems that we founf the the unnest_subq turned off.
finally to try to fix things i set the optimizer_features_enable=8.1.7
but some of our explain plans have changed wherein the query was using a sort is not now using concatenation.
any ideas thoughts on why this is happening.
strangely enough if i run some of the queires using optimizer_goal=rule they do run very fast. and have a better explain plan.
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Received on Wed Jun 30 2004 - 10:06:37 CDT
