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Asked by _TAD_ in Oracle Database, Oracle 9.x
We recently had a performance problem with a well established process. A quick query of the snapshot table showed that one specific query was eating up more than 50% of all CPU and had more than 43 million buffer gets - well above the normal/historical resource footprint.
A recompute of the statistics resolved the problem instantly - however, it took nearly 40 minites to get a hold of DBA who had sufficient security access to perform the recompute.
Statistics were last computed on 8/21/08 and the process ran perfectly for 4 days before having problems.
So, the question is: what problem could occur that would cause such poor performance (which can be fixed by recomputing statistics)? Did the application somehow get a bad explain plan?
How can we prevent this kind of issue from happening in the future?
20091118-EE-VQP-93 / EE_QW_2_20070628