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Is there any other reason, other than lower memory footprint that would make one opt for MariaDB over MySQL, if you were aiming to create a DNS master / slave setup in PowerDNS?
If you want small memory usage, use mysql 5.0/5.1 with myisam storage-engine. MySQL 5.5+ or MariaDB use more memory usage.
..:: Kloxo-MR - hosting and forum ::..
The low version save your memory very much.