Oracle Scratchpad

August 6, 2013

12c subquery factoring

Filed under: 12c,Bugs,Oracle,Subquery Factoring,Tuning — Jonathan Lewis @ 8:08 am GMT Aug 6,2013

I’ve written a few notes about anomalies in subquery factoring (with subquery) in the past, principally making a fuss about the fact that moving an inline view into a “with subquery” can cause a plan to change even when the internal code moves the subquery back in line. With the arrival of 12c one of my first sets of tests was to rerun all the examples to see how many of them had been addressed. I hadn’t written about as many examples as I had thought, and some of them had been fixed before 12c, but here are few references to a couple of outstanding items that I thought worth a mention:

[Further reading on “subquery factoring”]

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