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mysql.roles_mapping Table

MariaDB starting with 10.0.5

Roles were introduced in MariaDB 10.0.5.

The mysql.roles_mapping table contains information about mariaDB roles.

MariaDB starting with 10.4

In MariaDB 10.4 and later, this table uses the Aria storage engine.

MariaDB until 10.3

In MariaDB 10.3 and before, this table uses the MyISAM storage engine.

The mysql.roles_mapping table contains the following fields:

Field	Type	Null	Key	Default	Description
`Host`	`char(60)`	NO	PRI		Host (together with `User` and `Role` makes up the unique identifier for this record.
`User`	`char(80)`	NO	PRI		User (together with `Host` and `Role` makes up the unique identifier for this record.
`Role`	`char(80)`	NO	PRI		Role (together with `Host` and `User` makes up the unique identifier for this record.
`Admin_option`	`enum('N','Y')`	NO		N	Whether the role can be granted (see the CREATE ROLE `WITH ADMIN` clause).

The Acl_role_grants status variable, added in MariaDB 10.1.4, indicates how many rows the mysql.roles_mapping table contains.

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https://mariadb.com/kb/en/mysqlroles_mapping-table/