On 7/8/05, Rod Taylor <pg@rbt.ca> wrote:
> Create 2 sequences, one for counting tuple additions and one for
> counting tuple deletions.
>
> When you INSERT a tuple, bump the "added" sequence (select nextval());
>
> When you DELETE a tuple, bump the "deleted" sequence (select nextval());
>
> To retrieve an approximate count, take the current value of both
> sequences (select directly -- don't use currval) and subtract the
> "deletes" from the "adds".
Never thought of that! Good idea. :-)
Regards, Dawid
PS: There aren't any on ROLLBACK triggers, right? ;-)))