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Enforcing Storage Engine

Percona Server for MySQL has implemented variable which can be used for enforcing the use of a specific storage engine.

When this variable is specified and a user tries to create a table using an explicit storage engine that is not the specified enforced engine, he will get either an error if the NO_ENGINE_SUBSTITUTION SQL mode is enabled or a warning if NO_ENGINE_SUBSTITUTION is disabled and the table will be created anyway using the enforced engine (this is consistent with the default MySQL way of creating the default storage engine if other engines aren’t available unless NO_ENGINE_SUBSTITUTION is set).

In case user tries to enable enforce_storage_engine with engine that isn’t available, system will not start.


If you’re using enforce_storage_engine, you must either disable it before doing mysql_upgrade or perform mysql_upgrade with server started with --skip-grants-tables.

Version Specific Information

  • Percona Server for MySQL 5.7.10-1: Feature ported from Percona Server for MySQL 5.6

System Variables


Option Description
Command-line Yes
Config file Yes
Scope Global
Dynamic No
Data type String
Default NULL


This variable is not case sensitive.


Adding following option to source/glossary.rst`my.cnf` will start the server with InnoDB as enforced storage engine.


Last update: 2022-09-27