Reusing Dead Tuples:

Hi,  I am doing some experiments on dead tuples,  I am looking of reusing the
dead tuples  apace in a particular page during the "Update".This patch 
is meant for the tables
which are heavily updated to avoid vacuum very frequently.By  using it 
will arrest the size of
table for heavily updated table. The algorithm works like this:1) During the update it check for the dead tuples in the
current
 
page(page that containthe tuple that need to be updated). If it finds any dead tuples it uses 
the dead tuple spaceby ovewriting on dead tuple. The checking of dead tuple is very similer 
to the task that of
lazy vaccum.2) If it cannot find any dead tuple  it proceed as usual by inserting 
at the end of table .
Performance Effect: 1) The CPU processing will be slighly more for the update, but io 
processing is
exactly same2)  The size of table grows slower under heavy update , so vacuum is 
not required very frequently. The total processing for update is more or less same   even  after 
doing large number of updates without vacuum.

Does it breaks anythings  by overwriting the dead tuples ?.

Comments?.

jana