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Buffer Pins

Sometimes you get some questions on OTN lead to very geeky investigations. Here’s one that came up a while ago that started with a reasonable observation about recursive subquery factoring, then devolved into a real geek-attack question about buffer headers (x$bh) and buffer pins (x$kccbf).

I contributed a couple of ideas and some basic SQL to the discussion but never got around to doing anything concrete. If anyone has time and is sufficiently curious to play around I’d be interested to see what you did and what conclusions you came to.