I have implemented initial concept of 2nd level cache. Idea is to keep some
segments of shared memory for special buffers (e.g. indices) to prevent
overwrite those by other operations. I added those functionality to nbtree
I tested this with doing index scan, seq read, drop system buffers, do index
scan and in few places I saw performance improvements, but actually, I'm not
sure if this was just "random" or intended improvement.
There is few places to optimize code as well, and patch need many work, but
may you see it and give opinions?
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