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SQL Performance (MOSC)

cost based optimizer

Apr 29, 2016 12:25AM edited May 6, 2016 5:05AM in SQL Performance (MOSC) 2 commentsAnswered

In many cases we are seeing optimizer is choosing plan depending on cost where elapsed time is more.

Why can't oracle implement time -based optimizer?

How to fix such issues where wrong plan (which takes more time) is selected over faster plan since cost was low..? baseline?

Why time is not proportional to cost always.

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