On Tue, 14 Sep 1999, Michael Green wrote:
> UPDATE routerinfo SET lastdate = '09-14-1999', lasttime = '09:00' WHERE
> linkid = 'Sydney';
>
> Routerinfo is 8k after the initial update, from then on it grows 8k for
> every update. I never do an insert and it never grows beyond 16 rows. It
Check out mvcc. Basically running an update does duplicate the tuple. A
vacuum will reclaim the extra space. 8k (an entire page) seems a little
excessive for each updated tuple, but I don't really know anything about
how data is physically stored.
I generally run vacuum; once a night and vacuum analyze; once a week, but
that's more or less dependant on tyour database.
-Michael