Manual:content テーブル

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MediaWiki のデータベース レイアウト

content テーブル

MediaWiki バージョン:

≧ 1.31

content テーブルはコンテンツ オブジェクトを表現します。 A content row represents a slot of a wiki page. The same content row can be reused for many revisions (e.g. when the edits only changed other slots); its association with revisions is tracked by the slots table.

The content table does not hold the actual content (such as the wikitext of a page), just a reference to it. 主な目的は、コンテントオブジェクトを生成するときに読み込んで解釈される連続データ群にとって必要なメタデータを提供することです。

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).

フィールド

content_id

コンテントオブジェクトのID

content_size

コンテントオブジェクトの表面上サイズ（連続したデータのまとまりには不要）

content_sha1

コンテントオブジェクトの表面上ハッシュ（連続したデータのまとまりには不要）

content_model

content_models.model_id への参照。 Note the serialization format isn't specified; it should be assumed to be in the default format for the model unless auto-detected otherwise.

content_address

URL-like address of the content blob. Usually the structure is: tt:<id> where <id> is a number referencing the text.old_id column.

Since MediaWiki 1.43 (タスク T362566), when using external storage, the structure is es:<URL> where <URL> is an External Storage reference, with flags added as a query string. Example: es:DB://cluster1/692465?flags=utf-8,gzip</tvar>

スキーマの要約

MediaWiki バージョン:

≧ 1.31

DESCRIBE content;

+-----------------+----------------------+------+-----+---------+----------------+
| Field           | Type                 | Null | Key | Default | Extra          |
+-----------------+----------------------+------+-----+---------+----------------+
| content_id      | bigint(20) unsigned  | NO   | PRI | NULL    | auto_increment |
| content_size    | int(10) unsigned     | NO   |     | NULL    |                |
| content_sha1    | varbinary(32)        | NO   |     | NULL    |                |
| content_model   | smallint(5) unsigned | NO   |     | NULL    |                |
| content_address | varbinary(255)       | NO   |     | NULL    |                |
+-----------------+----------------------+------+-----+---------+----------------+

インデックス

MediaWiki バージョン:

≧ 1.31

SHOW INDEX IN content;

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