Curt Sampson <[EMAIL PROTECTED]> writes: > Back when I was working out how to do this, I reckoned that you could > use mmap by keeping a write queue for each modified page. Reading, > you'd have to read the datum from the page and then check the write > queue for that page to see if that datum had been updated, using the > new value if it's there. Writing, you'd add the modified datum to the > write queue, but not apply the write queue to the page until you'd had > confirmation that the corresponding transaction log entry had been > written. So multiple writes are no big deal; they just all queue up in > the write queue, and at any time you can apply as much of the write > queue to the page itself as the current log entry will allow.
Seems to me the overhead of any such scheme would swamp the savings from avoiding kernel/userspace copies ... the locking issues alone would be painful. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])