For those having MySQL memory usage issues, using MariaDB would help a lot, in my experience it's much less of a resource hog than MySQL.
If you are a noob you don't even have to configure it to squeeze the best performance, it's configured for a production environment from the start.
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P.S MariaDB is a fork of MySQL developed when MySQL was acquired by Oracle. Many of the original developers forked it to develop it as an open source, community driven project. It's as easy to setup as MySQL, simply take a database backup, uninstall MySQL, install MariaDB, configure and shizzle, restore backup... profit.