2007/5/18, Jonah H. Harris <[EMAIL PROTECTED]>:
Yes, a summary table updated by triggers is the only way to have
correct numbers... but you also pay the overhead of maintaining those
numbers on every INSERT/UPDATE statement.  If you just need
*reasonable* guesstimates, use reltuples in pg_class after an analyze.

Oops... INSERT or DELETE... :)

And remember that if using TRUNCATE, it will not run your trigger and
you will need to reset the counter manually.

Regards...
--
Daniel Cristian Cruz

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