ITAGAKI Takahiro <[EMAIL PROTECTED]> writes: > Here is a revised patch to reduce memory usage during VACUUM, > using FSMPageData (6 byte) instead of PageFreeSpaceInfo (8 or 16 bytes).
Applied, thanks. > The keepable pages with freespace will extended to 21GB from 8GB with > 16MB of default maintenance_work_mem. AFAICS, maintenance_work_mem doesn't really have anything to do with this; but it should reduce memory usage anyway if you've got large relations and a large max_fsm_pages setting. I'm a bit worried that the change may be pointless if FSM is rewritten to not use dedicated shared memory, as I hope will happen for 8.4. But we can always revert it if that happens. regards, tom lane -- Sent via pgsql-patches mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches