How will MySql and Sqlite affect server performance?

How will MySql and Sqlite databases affect my server's performace? Obviously I know that the more plugins I load on the server, the less efficient it will run. I am wondering, however, about the specific effects of using these databases.

Also, are Mysql and Sqlite more efficient databases than flatfile?

 

Mysql and Sqlite shouldnt affect anything if u got enough member depending on how many plugins you run cause every plugin uses some of ur memory and ram but ive noticed Mysql and Sqlite only use memory

 

Assuming I know what your meaning to say... MySql and Sqlite use HDD? And *not* RAM?

 

Yes HDD lol

 

MySQL is much more efficient and much faster than FF, if you use it you should notice a performance difference. Sqlite is a flat file version of MySQL, it has to read from the HDD and thus is slower, but its a powerful db system.