On Mon, 2005-10-31 at 16:34, Tomeh, Husam wrote: > My understanding that the current release of Postgres does not allow > the DBA to pre-allocated space for the data files or tablespace in > advance (as Oracle or SQL Server does). Am I correct on that ? If > that's still the case, is this item on the TODO list or the white > board? Pre-allocating space will prevent extending the datafile during > loading massive data (batch processing) and would improve the overall > batch write performance. I can't see pre-allocation making much if any difference in any modern OS, except it might lower fragmentation of the file a bit. Writing data is writing data. It takes time, whether you're writing it into a file that already exists with zeros in it or a new blank file you just created. Have you got any file system benchmarks that back up this assertion? I would love to see something that shows one way or the other if that really makes any difference. ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
