On Wed, 28 Apr 2004 09:05:04 -0400, Tom Lane <tgl@sss.pgh.pa.us> 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