Question

The FAQ of PHPMyAdmin has this to say about its approximate row counts for InnoDB:

phpMyAdmin uses a quick method to get the row count, and this method only returns an approximate count in the case of InnoDB tables.

I would like to use this ‘quick method’ – but everywhere I search seems to have a different answer.

Does anyone know?

Answer 1

They do this:

SHOW TABLE STATUS LIKE 'foo';

This returns a ‘Rows’ column. With
MyISAM it’s 100% accurate, InnoDB just
guesses. This is why MyISAM is faster
than InnoDB when doing a ‘SELECT
COUNT(*)’ query without a where
clause.

phpMyAdmin is open-source, so you can just go into the code and see for yourself!