On Tue, 13 Apr 2004 13:55:49 -0400, Tom Lane <[EMAIL PROTECTED]> wrote: >Possibly the >nonuniform clumping of CID has something to do with the poor results.
It shouldn't. The sampling algorithm is designed to give each tuple the same chance of ending up in the sample, and tuples are selected independently. (IOW each one of the {N \chooose n} possible samples has the same probability.) There are known problems with nonuniform distribution of dead vs. live and large vs. small tuples, but AFAICS the order of values does not matter. Servus Manfred ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings