K C Lau wrote:

I'm wondering if this performance issue is common enough for other users to merit a fix in pg, especially as it seems that with MVCC, each of the data records need to be accessed in addition to scanning the index.



Yes - there are certainly cases where index only access (or something similar, like b+tree tables) would be highly desirable.

From what I have understood from previous discussions, there are difficulties involved with producing a design that does not cause new problems...

regards

Mark

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