Manual:slots table

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MediaWiki database layout

slots table

MediaWiki version:

≥ 1.31

The slots table represent an n:m relation between revisions and content objects. A content object can have a specific "role" in one or more revisions. Each revision can have multiple content objects, each having a different role.

The table 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

slot_revision_id

Reference to revision.rev_id or archive.ar_rev_id. slot_revision_id and slot_role_id together comprise the primary key.

slot_role_id

Reference to slot_roles.role_id

slot_content_id

Reference to content.content_id

slot_origin

The revision.rev_id of the revision that originated the slot's content. To find revisions that changed slots, look for slot_origin = slot_revision_id.

Schema

MediaWiki version:

≥ 1.31

DESCRIBE slots;

+------------------+----------------------+------+-----+---------+-------+
| Field            | Type                 | Null | Key | Default | Extra |
+------------------+----------------------+------+-----+---------+-------+
| slot_revision_id | bigint(20) unsigned  | NO   | PRI | NULL    |       |
| slot_role_id     | smallint(5) unsigned | NO   | PRI | NULL    |       |
| slot_content_id  | bigint(20) unsigned  | NO   |     | NULL    |       |
| slot_origin      | bigint(20) unsigned  | NO   |     | NULL    |       |
+------------------+----------------------+------+-----+---------+-------+

Indexes

MediaWiki version:

≥ 1.31

SHOW INDEX IN slots;

+-------+------------+---------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name                  | Seq_in_index | Column_name      | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+---------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| slots |          0 | PRIMARY                   |            1 | slot_revision_id | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| slots |          0 | PRIMARY                   |            2 | slot_role_id     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| slots |          1 | slot_revision_origin_role |            1 | slot_revision_id | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| slots |          1 | slot_revision_origin_role |            2 | slot_origin      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| slots |          1 | slot_revision_origin_role |            3 | slot_role_id     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+-------+------------+---------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+