Christopher Browne <[EMAIL PROTECTED]> writes: > The "right answer" for most use seems likely to involve: > a) Getting an appropriate number of bins (I suspect 10 is a bit > small, but I can't justify that mathematically), and
I suspect that also, but I don't have real evidence for it either. We've heard complaints from a number of people for whom it was indeed too small ... but that doesn't prove it's not appropriate in the majority of cases ... > Does the sample size change if you increase the number of bins? Yes, read the comments in backend/commands/analyze.c. > Do we also need a parameter to control sample size? Not if the paper I read before writing that code is correct. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match