https://bugzilla.wikimedia.org/show_bug.cgi?id=56840

--- Comment #20 from Nik Everett <[email protected]> ---
(In reply to comment #19)
> (Hopefully $dbr->estimateRowCount() executes in O(1) time!)

For MySQL, PostgreSQL, and MSSQL it is O(1) because it uses an explain.  Looks
like Sqllite and Oracle do it with a COUNT(*) though.  I know Oracle hides its
explain output behind obtuse views that you may or may not have access to.  I'm
not sure about Sqllite.

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