On Mon, 2005-12-12 at 15:07 +1300, Mike C wrote: > Partitioning on date range doesn't make much sense for this setup, > where a typical 1-month query spans both tables (as the billing month > for the customer might start midway through a calendar month). Maybe not for queries, but if you use a date range then you never need to run a DELETE and never need to VACUUM. You could split the data into two-day chunks. > Am I using a horrid method for partitioning the data? (% 10) No, but what benefit do you think it provides. I'm not sure I see... > Should there be that big of an improvement for multiple tables given > that all the data is still stored on the same filesystem? You could store partitions in separate tablespaces/filesystems. Best Regards, Simon Riggs