=?iso-8859-1?q?Mamta=20Singh?= <mamta_csd(at)yahoo(dot)co(dot)in> writes:
> Also, give me some idea as to what do we
> need to change to implement undo-file.
It's very unlikely that we'll ever implement WAL-based UNDO.
No one has given any convincing reason to think it's a good idea.
regards, tom lane