> What is it about the buffer cache that makes it so unhappy being able to > hold everything? I don't want to be seen as a cache hit fascist, but isn't > it just better if the data is just *there*, available in the postmaster's > address space ready for each backend process to access it, rather than > expecting the Linux cache mechanism, optimised as it may be, to have to do > the caching?
The disk cache on most operating systems is optimized. Plus, keeping shared buffers low gives you more room to bump up the sort memory, which will make your big queries run faster. Merlin ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
