access controll in MySQL

[Antonin Karasek <lists@ceskyserver.cz>]

Hi,
I plan to create a user administration based on MySQL. And I want to 
make it really secure :o))

As I know, MySQL privilege system is based on "mysql" database, which is 
copied into memory at startup.


My question is: Should I expect any preformance loss, if some tables 
(columns_priv, user) in the database would have thousants of rows?

Many thanks for tips :o)

Regards

	Tony