On Sun, 2005-12-18 at 15:02 +1300, Mark Kirkwood wrote: > Yeah - the quoted method of "make a cartesian product of the dimensions > and then join to the fact all at once" is not actually used (as written) > in many implementations
But it is used in some, which is why I mentioned it. I gave two implementations, that is just (1) > - probably for the reasons you are pointing out. > I found these two papers whilst browsing: > > > http://www.cs.brown.edu/courses/cs227/Papers/Indexing/O'NeilGraefe.pdf > http://www.dama.upc.edu/downloads/jaguilar-2005-4.pdf > > > They seem to be describing a more subtle method making use of join > indexes and bitmapped indexes. Which is the option (2) I described. Best Regards, Simon Riggs ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
