On Fri, 22 Aug 2003, Mike Mascari wrote: > In addition to Jan's points, using a single pre-allocated file also > reduces file descriptor consumption, although I don't know what the > costs are regarding maintaining the LRU of file descriptors, the price > of opens and closes, the price of having a high upper limit of file > descriptors, etc. >
another thought I had - I wonder how much fragmentation affects postgres (and others). On Informix when you use "cooked files" it needs to preallocate all the space. I figured part of it was to 1. make the file seem more like a device 2. reduce fragmentation 3. guarantee that 2GB "chunk" can never have an out of space issue. On a dedicated pg box there is probably not much fragmentation (and thanks to today's modern filesystems, it isn'ttoo big of a deal in any case).. but it would still be interesting to have numbers.. -- Jeff Trout <[EMAIL PROTECTED]> http://www.jefftrout.com/ http://www.stuarthamm.net/ ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
