The slot_roles table is a normalization table for role names. It is used by the slots table.

In PHP code, normalization is managed via NameTableStore .

It was introduced in MediaWiki 1.31 as part of the Multi-Content Revisions project; see Multi-Content Revisions/Content Meta-Data for details. During migration from older versions, the table is populated by populateContentTables.php (run automatically by the upgrade script).

Fields

Schema

DESCRIBE slot_roles;

+-----------+---------------+------+-----+---------+----------------+
| Field     | Type          | Null | Key | Default | Extra          |
+-----------+---------------+------+-----+---------+----------------+
| role_id   | int(11)       | NO   | PRI | NULL    | auto_increment |
| role_name | varbinary(64) | NO   | UNI | NULL    |                |
+-----------+---------------+------+-----+---------+----------------+

DESCRIBE slot_roles;

+-----------+---------------+------+-----+---------+----------------+
| Field     | Type          | Null | Key | Default | Extra          |
+-----------+---------------+------+-----+---------+----------------+
| role_id   | smallint(6)   | NO   | PRI | NULL    | auto_increment |
| role_name | varbinary(64) | NO   | UNI | NULL    |                |
+-----------+---------------+------+-----+---------+----------------+

Indexes

SHOW INDEX IN slot_roles;

+------------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table      | Non_unique | Key_name  | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+------------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| slot_roles |          0 | PRIMARY   |            1 | role_id     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| slot_roles |          0 | role_name |            1 | role_name   | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+------------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+