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MariaDB developers claim that it's a drop-in replacement, and it's true until version 5.5. MariaDB 5.1-5.2-5.3 can replace MySQL 5.1. MariaDB 5.5 can replace MySQL 5.5 The small "incompatibility" issues usually don't apply, however, they are documented here: https://kb.askmonty.org/en/mariadb-vs-mysql-compatibility/ There are also a lot of bug fixes and ...

At present, only MyISAM permits auto_increment values in a composite key. I wrote about this over a year ago : How can you have two auto-incremental columns in one table? According to the Book Section 5.7 Page 89 Paragraph 1 states the following: The MyISAM Storage Engine supports composite indexes that include an AUTO_INCREMENT column. This allows ...