On Wed, 28 Apr 2004 09:05:04 -0400, Tom Lane <[EMAIL PROTECTED]> wrote: >> [ ... visibility information in index tuples ... ]
>Storing that information would at least double the overhead space used >for each index tuple. The resulting index bloat would significantly >slow index operations by requiring more I/O. So it's far from clear >that this would be a win, even for those who care only about select >speed. While the storage overhead could be reduced to 1 bit (not a joke) we'd still have the I/O overhead of locating and updating index tuples for every heap tuple deleted/updated. Servus Manfred ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])