Manual:pagelinks table

MediaWiki database layout

pagelinks table

MediaWiki version:

≥ 1.5

The pagelinks table tracks all internal links in the wiki. Each entry contains the source page's ID and a reference to the linktarget table which has the title and namespace (number) that is being linked to from within that source page. There may be many instances of the source page's ID, as many as the internal links within it, but there can be only one entry per internal link for any page ID (or MySQL will yell out a fatal error).

Note that the target page may or may not exist, and due to renames and deletions may refer to different page records as time goes by.

The table was introduced in version 1.5. It is the result of merging the links table and the brokenlinks table of version 1.4. Regenerating the pagelinks table is always possible using the rebuildall.php maintenance script.

Fields

pl_from

The page_id of the page containing the link.

pl_from_namespace

MediaWiki version:

≥ 1.24

The page_namespace of the page containing the link.

pl_target_id

MediaWiki version:

≥ 1.41

Gerrit change 941474

Foreign key to linktarget.

pl_namespace

MediaWiki version:

≤ 1.42

The page_namespace of the target page. The target page may or may not exist, and due to renames and deletions may refer to different page records as time goes by.

pl_title

MediaWiki version:

≤ 1.42

The title of the target page in the page_title format. The target page may or may not exist, and due to renames and deletions may refer to different page records as time goes by. Spaces are converted to underscores, and the first letter may be automatically capitalized. So for example, a link to foo bar would have a pl_title of "Foo_bar" assuming $wgCapitalLinks = true; and no $wgCapitalLinkOverrides.

Schema summary

MediaWiki version:

≥ 1.43

DESCRIBE pagelinks;

+-------------------+---------------------+------+-----+---------+-------+
| Field             | Type                | Null | Key | Default | Extra |
+-------------------+---------------------+------+-----+---------+-------+
| pl_from           | int(10) unsigned    | NO   | PRI | 0       |       |
| pl_target_id      | bigint(20) unsigned | NO   | PRI | NULL    |       |
| pl_from_namespace | int(11)             | NO   | MUL | 0       |       |
+-------------------+---------------------+------+-----+---------+-------+

MediaWiki versions:

1.41 – 1.42

DESCRIBE pagelinks;

+-------------------+---------------------+------+-----+---------+-------+
| Field             | Type                | Null | Key | Default | Extra |
+-------------------+---------------------+------+-----+---------+-------+
| pl_from           | int(10) unsigned    | NO   | PRI | 0       |       |
| pl_namespace      | int(11)             | NO   | PRI | 0       |       |
| pl_title          | varbinary(255)      | NO   | PRI |         |       |
| pl_from_namespace | int(11)             | NO   | MUL | 0       |       |
| pl_target_id      | bigint(20) unsigned | YES  | MUL | NULL    |       |
+-------------------+---------------------+------+-----+---------+-------+

MediaWiki versions:

1.36 – 1.40

DESCRIBE pagelinks;

+-------------------+------------------+------+-----+---------+-------+
| Field             | Type             | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+-------+
| pl_from           | int(10) unsigned | NO   | PRI | 0       |       |
| pl_namespace      | int(11)          | NO   | PRI | 0       |       |
| pl_title          | varbinary(255)   | NO   | PRI |         |       |
| pl_from_namespace | int(11)          | NO   | MUL | 0       |       |
+-------------------+------------------+------+-----+---------+-------+

MediaWiki versions:

1.26 – 1.35

DESCRIBE pagelinks;

+-------------------+------------------+------+-----+---------+-------+
| Field             | Type             | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+-------+
| pl_from           | int(10) unsigned | NO   | PRI | 0       |       |
| pl_from_namespace | int(11)          | NO   | MUL | 0       |       |
| pl_namespace      | int(11)          | NO   | PRI | 0       |       |
| pl_title          | varbinary(255)   | NO   | PRI |         |       |
+-------------------+------------------+------+-----+---------+-------+

MediaWiki versions:

1.24 – 1.25

DESCRIBE pagelinks;

+-------------------+------------------+------+-----+---------+-------+
| Field             | Type             | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+-------+
| pl_from           | int(10) unsigned | NO   | PRI | 0       |       |
| pl_from_namespace | int(11)          | NO   |     | 0       |       |
| pl_namespace      | int(11)          | NO   | PRI | 0       |       |
| pl_title          | varbinary(255)   | NO   | PRI |         |       |
+-------------------+------------------+------+-----+---------+-------+

MediaWiki versions:

1.10 – 1.23

DESCRIBE pagelinks;

+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| pl_from      | int(10) unsigned    | NO   | PRI | 0       |       |
| pl_namespace | int(11)             | NO   | PRI | 0       |       |
| pl_title     | varchar(255) binary | NO   | PRI | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+

MediaWiki versions:

1.5 – 1.9

DESCRIBE pagelinks;

+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| pl_from      | int(8) unsigned     | NO   | PRI | 0       |       |
| pl_namespace | int(11)             | NO   | PRI | 0       |       |
| pl_title     | varchar(255) binary | NO   | PRI | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+

Indexes

MediaWiki version:

≥ 1.43

SHOW INDEX IN pagelinks;

+-----------+------------+----------------------------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table     | Non_unique | Key_name                         | Seq_in_index | Column_name       | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-----------+------------+----------------------------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| pagelinks |          0 | PRIMARY                          |            1 | pl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          0 | PRIMARY                          |            2 | pl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          1 | pl_target_id                     |            1 | pl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          1 | pl_target_id                     |            2 | pl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          1 | pl_backlinks_namespace_target_id |            1 | pl_from_namespace | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          1 | pl_backlinks_namespace_target_id |            2 | pl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| pagelinks |          1 | pl_backlinks_namespace_target_id |            3 | pl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+-----------+------------+----------------------------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+