Manual:Site identifiers table

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MediaWiki database layout

site_identifiers table

MediaWiki version:

≥ 1.21

The site_identifiers table contains:

Fields

si_site

ID of site record in sites table.

si_type

One of two values:

• interwiki: the key is an interwiki link identifier such as en, tr, simple
• equivalent: the key is a navigation id used in e.g. the "language links" section

In most cases these entries are both present and are identical for Wikimedia sites. Some sites have only an interwiki entry, for example commons, mediawiki, meta.

si_key

A language code or other link code, such as en, tr, simple, commons, plwikimedia, identifying a site's type for purposes of links between sites in a wiki farm.

Schema summary

MediaWiki version:

≥ 1.35

DESCRIBE site_identifiers;

+---------+------------------+------+-----+---------+-------+
| Field   | Type             | Null | Key | Default | Extra |
+---------+------------------+------+-----+---------+-------+
| si_type | varbinary(32)    | NO   | PRI | NULL    |       |
| si_key  | varbinary(32)    | NO   | PRI | NULL    |       |
| si_site | int(10) unsigned | NO   | MUL | NULL    |       |
+---------+------------------+------+-----+---------+-------+

MediaWiki versions:

1.21 – 1.34

DESCRIBE site_identifiers;

+---------+------------------+------+-----+---------+-------+
| Field   | Type             | Null | Key | Default | Extra |
+---------+------------------+------+-----+---------+-------+
| si_site | int(10) unsigned | NO   | MUL | NULL    |       |
| si_type | varbinary(32)    | NO   | PRI | NULL    |       |
| si_key  | varbinary(32)    | NO   | PRI | NULL    |       |
+---------+------------------+------+-----+---------+-------+

Indexes

MediaWiki version:

≥ 1.36

SHOW INDEX IN site_identifiers;

+------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table            | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| site_identifiers |          0 | PRIMARY  |            1 | si_type     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| site_identifiers |          0 | PRIMARY  |            2 | si_key      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| site_identifiers |          1 | si_site  |            1 | si_site     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| site_identifiers |          1 | si_key   |            1 | si_key      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+