Re: Win2K Questions

Jean-Luc Lachance  writes:
> What would be involved in adding version and visibility to the index?

* Index bloat.  An index entry is currently 8 bytes plus the index key,
eg 12 bytes for an int4 index.  Version info would add 12 bytes.
Doubling the size of indexes would double the time for index scans.

* Update costs.  Instead of one place to update when a row is updated,
now all the associated index entries would have to be updated too.

			regards, tom lane