Why should I use InnoDB and MySql instead of XtraDB and MariaDB, except that InnoDB and Mysql happen to be installed by default on my servers?
Why isn't MariaDB and XtraDB installed by default everywhere?
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Performance enhancement may be possible without major upgrade to the next version of MySQL or a Migration to MariaDB.
To be honest, some people upgrade to MariaDB for nontechnical reasons
Before deciding on moving over to MariaDB (or any other MySQL fork), you need to be sure you understand the features, improvements, and the configuration settings, and you actually follow through on the settings to make those improvements come to life. See my post How do I properly perform a MySQL bake-off?
In light of all this