Originally Posted by Sembroidery
On a store updated from older versions some (a few) tables show InnoDB while others are MyISAM. Would it be recommended to switch all tables to InnoDB?
It is definitely recommended in 3 cases.
1) You are using the newest MySQL/MariaDB version.
2) You are experiencing the loss of productivity due to the Meltdown Fix.
3) You are experiencing the MySQL error 'MySQL table is marked as crashed and should be repaired'
In other cases, it is recommended to measure the BEFORE/AFTER performance on a dev server.