Thanks Kevin !! I will have a look at the source tree.
Regards VB On Tue, Sep 27, 2011 at 10:45 PM, Kevin Grittner < kevin.gritt...@wicourts.gov> wrote: > Venkat Balaji <venkat.bal...@verse.in> wrote: > > > I would like to know the difference between "n_tup_upd" and > > "n_tup_hot_upd". > > A HOT update is used when none of the updated columns are used in an > index and there is room for the new tuple (version of the row) on > the same page as the old tuple. This is faster for a number of > reasons, and cleanup of the old tuple is a little different. > > If you want the gory implementation details, take a look at this > file in the source tree: > > src/backend/access/heap/README.HOT > > -Kevin >
