Comments - OPTIMIZE TABLE
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.
To avoid having lock on the table during the operation you can use
ALTER TABLE t ENGINE=InnoDB, ALGORITHM=INPLACE;
(Like mysql > 5.7.4)
No idea since which version this has been introduced but > 10 has this.