Alex Turner <[EMAIL PROTECTED]> writes: > I was wondering about index types. Oracle has an index type called a > 'bitmap' index.
There's a great deal about this in the list archives (probably more in pgsql-hackers than in -performance). Most of the current interest has to do with building in-memory bitmaps on the fly, as a way of decoupling index and heap scan processing. Which is not quite what you're talking about but should be pretty effective for low-cardinality cases. In particular it'd allow AND and OR combination of multiple indexes, which we do poorly or not at all at the moment. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]