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mysql.db Table

The mysql.db table contains information about database-level privileges. The table can be queried and although it is possible to directly update it, it is best to use GRANT for setting privileges.

Note that the MariaDB privileges occur at many levels. A user may not be granted a privilege at the database level, but may still have permission on a table level, for example. See privileges for a more complete view of the MariaDB privilege system.

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.db table contains the following fields:

Field	Type	Null	Key	Default	Description	Introduced
`Host`	`char(60)`	NO	PRI		Host (together with `User` and `Db` makes up the unique identifier for this record. Until MariaDB 5.5, if the host field was blank, the corresponding record in the mysql.host table would be examined. From MariaDB 10.0, a blank host field is the same as the `%` wildcard.
`Db`	`char(64)`	NO	PRI		Database (together with `User` and `Host` makes up the unique identifier for this record.
`User`	`char(80)`	NO	PRI		User (together with `Host` and `Db` makes up the unique identifier for this record.
`Select_priv`	`enum('N','Y')`	NO		N	Can perform SELECT statements.
`Insert_priv`	`enum('N','Y')`	NO		N	Can perform INSERT statements.
`Update_priv`	`enum('N','Y')`	NO		N	Can perform UPDATE statements.
`Delete_priv`	`enum('N','Y')`	NO		N	Can perform DELETE statements.
`Create_priv`	`enum('N','Y')`	NO		N	Can CREATE TABLE's.
`Drop_priv`	`enum('N','Y')`	NO		N	Can DROP DATABASE's or DROP TABLE's.
`Grant_priv`	`enum('N','Y')`	NO		N	User can grant privileges they possess.
`References_priv`	`enum('N','Y')`	NO		N	Unused
`Index_priv`	`enum('N','Y')`	NO		N	Can create an index on a table using the CREATE INDEX statement. Without the `INDEX` privilege, user can still create indexes when creating a table using the CREATE TABLE statement if the user has have the `CREATE` privilege, and user can create indexes using the ALTER TABLE statement if they have the `ALTER` privilege.
`Alter_priv`	`enum('N','Y')`	NO		N	Can perform ALTER TABLE statements.
`Create_tmp_table_priv`	`enum('N','Y')`	NO		N	Can create temporary tables with the CREATE TEMPORARY TABLE statement.
`Lock_tables_priv`	`enum('N','Y')`	NO		N	Acquire explicit locks using the LOCK TABLES statement; user also needs to have the `SELECT` privilege on a table in order to lock it.
`Create_view_priv`	`enum('N','Y')`	NO		N	Can create a view using the CREATE_VIEW statement.
`Show_view_priv`	`enum('N','Y')`	NO		N	Can show the CREATE VIEW statement to create a view using the SHOW CREATE VIEW statement.
`Create_routine_priv`	`enum('N','Y')`	NO		N	Can create stored programs using the CREATE PROCEDURE and CREATE FUNCTION statements.
`Alter_routine_priv`	`enum('N','Y')`	NO		N	Can change the characteristics of a stored function using the ALTER FUNCTION statement.
`Execute_priv`	`enum('N','Y')`	NO		N	Can execute stored procedure or functions.
`Event_priv`	`enum('N','Y')`	NO		N	Create, drop and alter events.
`Trigger_priv`	`enum('N','Y')`	NO		N	Can execute triggers associated with tables the user updates, execute the CREATE TRIGGER and DROP TRIGGER statements.
`Delete_history_priv`	`enum('N','Y')`	NO		N	Can delete rows created through system versioning.	MariaDB 10.3.5

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

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