Unless of course you now have new knowledge in the region, you likely will say that in working with additional intricate statements and environments ( like my list of wishes higher than) you very likely gained’t manage to obtain the optimizer to generate a plan that matches just one from your previous.
Many thanks for the posts, they have been great. Relating to oracle efficiency, I'm pondering if I could Get the input. I happen to be researching / engaged on tuning challenges at our shop.
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Histograms could be problematic in 10g (too many and small sample measurements). So an intensive overview of those (almost certainly acquiring rid of many and raising the sample measurement on the ones you retain) is in purchased. But This may be a lengthy endeavor.
Outlines don’t show up to use the OPT_ESTIMATE trace. So I believe it remains to be a valid method of accept a SQL Profile as provided by the SQL Tuning Advisor and afterwards make an Define in addition to it.
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And we go away it on, til The brand new code is promoted. For your personal readers, it also overrides vendor hints in their SQL and puts in the ones we specify, each time a new index is beneficial, or even the desk needs a HJ vs. an NLJ. Remarkable, an actual KO.
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