Manual:page テーブル

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Manual:コンテンツ MediaWiki のデータベース レイアウト page table/ja


MediaWiki バージョン: 1.5

page テーブルは「ウィキの中核」とみなすことができます。 このテーブルには、ある一つのMediaWiki内にある各ページに対応したエントリーがあります。エントリーはタイトルによって識別され、そのほかにもいくつかの不可欠なメタデータも含まれています。 それは MediaWiki 1.5 のリビジョン r6710 で初めて導入されました。

ページの内容そのものは text テーブルに保存されます。 記事の内容を取り出す際、MediaWikiはpageテーブルの page_title をまず検索します。 そして revision テーブルの rev_id から page_latest と一致する値を検索し、rev_text_id を得ます。 得られた rev_text_id を text テーブルの old_id から検索し、ページ内容を取り出します。 ページが削除されると、各リビジョンは archive テーブルに移動されます。

If you want to completely delete a page manually from the database, be sure to delete the entry for the page in the page table, and for all the page's revisions in the revision table, and all of the text rows corresponding only to the page in the text table. This can be done by deleting the page row, then running maintenance/deleteOrphanedRevisions.php. See also title Deleting pages with their relationships in text and revision tables below how to do.

フィールド

page_id

Uniquely identifying primary key. This value is preserved across edits and renames.

Page IDs do not change when pages are moved, but they may change when pages are deleted and then restored. As of MediaWiki 1.27, the historical page ID is persisted in the archive table, and restored pages attempt to reclaim their old page ID.

MediaWiki offers a number of relevant tools:

  • The page ID of any page (except special pages) can be looked up in the "page information" link from the Tools menu.
  • The magic word {{PAGEID}} can be used to return the page id of a page.
  • The special page Special:Redirect can be used to access pages via their page IDs. For example, Special:Redirect/page/24280, redirects to the present page.
  • index.php accepts the parameter curid to access pages via their page IDs. For example, /w/index.php?curid=24280 will load the present page.

There are also many API features that either return the page ID or use it as an input. For example, for the present page, page_id = 10501, see https://www.mediawiki.org/w/api.php?action=query&prop=info&titles=Manual:Page%20table and https://www.mediawiki.org/w/api.php?action=query&prop=info&pageids=10501. This field can be accessed by WikiPage::getId(), Title::getArticleID(), etc.

page_namespace

A page name is broken into a namespace and a title. The namespace keys are UI-language-independent constants, defined in includes/Defines.php.

This field contains the number of the page's namespace. The values range from 0 to 15 for the standard namespaces, and from 100 to 2147483647 for custom namespaces.

page_title

The sanitized page title, without the namespace, with a maximum of 255 characters (binary). It is stored as text, with spaces replaced by underscores. The real title shown in articles is just this title with underscores (_) converted to spaces ( ). For example, a page titled "Talk:Foo Bar" would have "Foo_Bar" in this field.

page_restrictions

MediaWiki バージョン: 1.9

Comma-separated set of permission keys indicating who can move or edit the page. Edit and move sections are separated by a colon (e.g., "edit=autoconfirmed,sysop:move=sysop").

Beginning with MediaWiki 1.10, page protection controls were moved to the page restrictions table, so this field will be empty in databases generated by more current versions of MediaWiki. However, this field is still used in current versions of MediaWiki for rows generated by older versions of MediaWiki!

page_counter

MediaWiki バージョン: 1.24

Number of times the page has been viewed. This feature was completely removed in MediaWiki 1.25, following a request for comment. Even before that, many sites including Wikimedia projects disabled it to increase performance; see Manual:$wgDisableCounters for details.

page_is_redirect

A value of 1 here indicates the article is a redirect; it is 0 in all other cases.

page_is_new

This field stores whether the page is a new, meaning it either has only one revision or has not been edited since being restored, even if there is more than one revision. If the field contains a value of 1, then it indicates that the page is a new; otherwise, it is 0. Rollback links are not displayed if the page is new, since there is nothing to roll back to.

page_random

Random decimal value, between 0 and 1, used for Special:Random (see Manual:おまかせ表示 for more details). wfRandom() によって生成されます。

Around 2005, a bug caused these random values to be non-uniform. Since the field is set at page creation, wikis that have existed for a long time might still have some of these erroneous values. See T208909.

page_touched

This timestamp is updated whenever the page changes in a way requiring it to be re-rendered, invalidating caches. Aside from editing, this includes permission changes, creation or deletion of linked pages, and alteration of contained templates. Set to $dbw->timestamp() at the time of page creation.

page_links_updated

MediaWiki バージョン: 1.23

This timestamp is updated whenever a page is re-parsed and it has all the link tracking tables updated for it. This is useful for de-duplicating expensive backlink update jobs. Set to the default value of NULL when the page is created by WikiPage::insertOn().

page_latest

This is a foreign key to rev_id for the current revision. It may be 0 during page creation. It needs to link to a revision with a valid revision.rev_page, or there will be the "The revision #0 of the page named 'Foo' does not exist" error when one tries to view the page. Can be obtained via WikiPage::getLatest().

page_len

Uncompressed length in bytes of the page's current source text.

This however, does not apply to images which still have records in this table. Instead, the uncompressed length in bytes of the description for the file is used as the latter is in the text.old_text field.

The Wikipage class in includes/WikiPage.php has two methods, viz., insertOn() and updateRevisionOn() that are responsible for populating these details.

page_content_model

MediaWiki バージョン: 1.21

Content model, see CONTENT_MODEL_XXX constants. Comparable to revision.rev_content_model.

page_lang

MediaWiki バージョン: 1.24

ページ本文の言語です。 Set to the default value of NULL at the time of page creation.

スキーマの要約

MediaWiki バージョン: 1.25

DESCRIBE page;

+--------------------+---------------------+------+-----+----------------+----------------+
| Field              | Type                | Null | Key | Default        | Extra          |
+--------------------+---------------------+------+-----+----------------+----------------+
| page_id            | int(10) unsigned    | NO   | PRI | NULL           | auto_increment |
| page_namespace     | int(11)             | NO   | MUL | NULL           |                |
| page_title         | varbinary(255)      | NO   |     | NULL           |                |
| page_restrictions  | tinyblob            | NO   |     | NULL           |                |
| page_is_redirect   | tinyint(3) unsigned | NO   | MUL | 0              |                |
| page_is_new        | tinyint(3) unsigned | NO   |     | 0              |                |
| page_random        | double unsigned     | NO   | MUL | NULL           |                |
| page_touched       | binary(14)          | NO   |     |                |                |
| page_links_updated | varbinary(14)       | YES  |     | NULL           |                |
| page_latest        | int(10) unsigned    | NO   |     | NULL           |                |
| page_len           | int(10) unsigned    | NO   | MUL | NULL           |                |
| page_content_model | varbinary(32)       | YES  |     | NULL           |                |
| page_lang          | varbinary(35)       | YES  |     | NULL           |                |
+--------------------+---------------------+------+-----+----------------+----------------+
MediaWiki バージョン: 1.24

DESCRIBE page;

+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| page_id            | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace     | int(11)             | NO   | MUL | NULL    |                |
| page_title         | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions  | tinyblob            | NO   |     | NULL    |                |
| page_counter       | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect   | tinyint(3) unsigned | NO   | MUL | 0       |                |
| page_is_new        | tinyint(3) unsigned | NO   |     | 0       |                |
| page_random        | real unsigned       | NO   | MUL | NULL    |                |
| page_touched       | binary(14)          | NO   |     | NULL    |                |
| page_links_updated | varbinary(14)       | YES  |     | NULL    |                |
| page_latest        | int(10) unsigned    | NO   |     | NULL    |                |
| page_len           | int(10) unsigned    | NO   | MUL | NULL    |                |
| page_content_model | varbinary(32)       | YES  |     | NULL    |                |
| page_lang          | varbinary(35)       | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+
MediaWiki バージョン: 1.23

DESCRIBE page;

+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| page_id            | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace     | int(11)             | NO   | MUL | NULL    |                |
| page_title         | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions  | tinyblob            | NO   |     | NULL    |                |
| page_counter       | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect   | tinyint(3) unsigned | NO   | MUL | 0       |                |
| page_is_new        | tinyint(3) unsigned | NO   |     | 0       |                |
| page_random        | real unsigned       | NO   | MUL | NULL    |                |
| page_touched       | binary(14)          | NO   |     | NULL    |                |
| page_links_updated | varbinary(14)       | YES  |     | NULL    |                |
| page_latest        | int(10) unsigned    | NO   |     | NULL    |                |
| page_len           | int(10) unsigned    | NO   | MUL | NULL    |                |
| page_content_model | varbinary(32)       | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+
MediaWiki バージョン: 1.21 – 1.22

DESCRIBE page;

+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| page_id            | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace     | int(11)             | NO   | MUL | NULL    |                |
| page_title         | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions  | tinyblob            | NO   |     | NULL    |                |
| page_counter       | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect   | tinyint(3) unsigned | NO   | MUL | 0       |                |
| page_is_new        | tinyint(3) unsigned | NO   |     | 0       |                |
| page_random        | real unsigned       | NO   | MUL | NULL    |                |
| page_touched       | binary(14)          | NO   |     | NULL    |                |
| page_latest        | int(10) unsigned    | NO   |     | NULL    |                |
| page_len           | int(10) unsigned    | NO   | MUL | NULL    |                |
| page_content_model | varbinary(32)       | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+
MediaWiki バージョン: 1.19 – 1.20

DESCRIBE page;

+-------------------+---------------------+------+-----+---------+----------------+
| Field             | Type                | Null | Key | Default | Extra          |
+-------------------+---------------------+------+-----+---------+----------------+
| page_id           | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace    | int(11)             | NO   | MUL | NULL    |                |
| page_title        | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions | tinyblob            | NO   |     | NULL    |                |
| page_counter      | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect  | tinyint(3) unsigned | NO   | MUL | 0       |                |
| page_is_new       | tinyint(3) unsigned | NO   |     | 0       |                |
| page_random       | real unsigned       | NO   | MUL | NULL    |                |
| page_touched      | binary(14)          | NO   |     | NULL    |                |
| page_latest       | int(10) unsigned    | NO   |     | NULL    |                |
| page_len          | int(10) unsigned    | NO   | MUL | NULL    |                |
+-------------------+---------------------+------+-----+---------+----------------+
MediaWiki バージョン: 1.10 – 1.18

DESCRIBE page;

+-------------------+---------------------+------+-----+---------+----------------+
| Field             | Type                | Null | Key | Default | Extra          |
+-------------------+---------------------+------+-----+---------+----------------+
| page_id           | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace    | int(11)             | NO   | MUL | NULL    |                |
| page_title        | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions | tinyblob            | NO   |     | NULL    |                |
| page_counter      | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect  | tinyint(3) unsigned | NO   |     | 0       |                |
| page_is_new       | tinyint(3) unsigned | NO   |     | 0       |                |
| page_random       | real unsigned       | NO   | MUL | NULL    |                |
| page_touched      | binary(14)          | NO   |     | NULL    |                |
| page_latest       | int(10) unsigned    | NO   |     | NULL    |                |
| page_len          | int(10) unsigned    | NO   | MUL | NULL    |                |
+-------------------+---------------------+------+-----+---------+----------------+
MediaWiki バージョン: 1.5 – 1.9

DESCRIBE page;

+-------------------+---------------------+------+-----+---------+----------------+
| Field             | Type                | Null | Key | Default | Extra          |
+-------------------+---------------------+------+-----+---------+----------------+
| page_id           | int(8) unsigned     | NO   | PRI | NULL    | AUTO_INCREMENT |
| page_namespace    | int(11)             | NO   | MUL | NULL    |                |
| page_title        | varchar(255) binary | NO   |     | NULL    |                |
| page_restrictions | tinyblob            | NO   |     | NULL    |                |
| page_counter      | bigint(20) unsigned | NO   |     | 0       |                |
| page_is_redirect  | tinyint(1) unsigned | NO   |     | 0       |                |
| page_is_new       | tinyint(1) unsigned | NO   |     | 0       |                |
| page_random       | real unsigned       | NO   | MUL | NULL    |                |
| page_touched      | char(14) binary     | NO   |     | NULL    |                |
| page_latest       | int(8) unsigned     | NO   |     | NULL    |                |
| page_len          | int(8) unsigned     | NO   | MUL | NULL    |                |
+-------------------+---------------------+------+-----+---------+----------------+

インデックス

MediaWiki バージョン: 1.28

SHOW INDEX IN page;


+-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name                    | Seq_in_index | Column_name      | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| page  |          0 | PRIMARY                     |            1 | page_id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          0 | name_title                  |            1 | page_namespace   | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          0 | name_title                  |            2 | page_title       | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          1 | page_random                 |            1 | page_random      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          1 | page_len                    |            1 | page_len         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          1 | page_redirect_namespace_len |            1 | page_is_redirect | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          1 | page_redirect_namespace_len |            2 | page_namespace   | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| page  |          1 | page_redirect_namespace_len |            3 | page_len         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

Sample MySQLコードの例

一覧ページとその他の必須テーブルとの関係

以下のコードにより、中心となるテーブル(page, revision, text)から全記事の最新版を選択できます。

SELECT
    p.page_id AS "page_id",
    CAST(p.page_title AS CHAR(10000) CHARACTER SET utf8) AS "page_title",
    r.rev_text_id AS "revision_id",
    t.old_id AS "text_id"
FROM
    page p
        INNER JOIN revision r
            ON p.page_latest = r.rev_id
        INNER JOIN text t
            ON r.rev_text_id = t.old_id

Other important considerations:

  • to find undeleted pages add r.rev_deleted = 0
  • to find pages in namespace 0 add p.page_namespace = 0
  • to find pages that are not redirects add p.page_is_redirect = 0

These additional statements can be added either as conditions to a Where statement or as conditions on the appropriate Inner Join statement.

Deleting pages with their relationships in text and revision tables

The following shows the steps to run to help you delete pages and their children from the main pages in the page, revision and text tables.

Listing all related table keys

-- 
-- Listing page titles and related relationships to other tables (revision, text, page)
--
SELECT
    `p`.`page_id` AS "page_id",
    CAST(`p`.`page_title` AS CHAR(10000) CHARACTER SET utf8) AS "page_title",
    `r`.`rev_text_id` AS "revision_id",
    `t`.`old_id` AS "text_id"
FROM
    page p
        INNER JOIN `revision` r
            ON `p`.`page_id` = `r`.`rev_page`    -- Confirmed to be reference to page.page_id
        INNER JOIN `text` t
            ON `r`.`rev_text_id` = `t`.`old_id`  -- Confirmed to be reference to revision table
WHERE 
     `p`.`page_title` LIKE '%Tests/parent-a%';    -- Match with title of a parent page

Deleting from database the rows

-- 
-- Making a comma separated list of each table ids to delete, Will be used in a delete transaction
--
SELECT
    CONCAT('IN(', GROUP_CONCAT(`p`.`page_id`), ')') AS 'page',
    CONCAT('IN(', GROUP_CONCAT(`r`.`rev_text_id`), ')')  AS 'revision',
    CONCAT('IN(', GROUP_CONCAT(`t`.`old_id`), ')')  AS 'text'
FROM
    page p
        INNER JOIN `revision` r
            ON `p`.`page_id` = `r`.`rev_page`        -- Confirmed to be reference to page.page_id
        INNER JOIN text t
            ON `r`.`rev_text_id` = `t`.`old_id`      -- Confirmed to be reference to revision table
WHERE 
     p.page_title LIKE '%Tests/parent-a%';    -- Match with title of a parent page

以下のような結果が得られるでしょう。

+--------------------------------------------------+--------------------------------------------------+--------------------------------------------------+
| page                                             | revision                                         | text                                             |
+--------------------------------------------------+--------------------------------------------------+--------------------------------------------------+
| IN(5530,5528,5529,5530,5529,5528,5532,5532,5532) | IN(9918,9921,9917,9919,9920,9916,9922,9915,9923) | IN(9918,9921,9917,9919,9920,9916,9922,9915,9923) |
+--------------------------------------------------+--------------------------------------------------+--------------------------------------------------+
1 row in set (0.07 sec)

以下ののクエリで結合したidを置き換えてください。

-- 
-- DELETING pages in one transaction
-- NOTE: adjust the content IN(...) with your own :)
--
SET autocommit=0;
START TRANSACTION;
  DELETE FROM `page` WHERE page_id IN(5530,5528,5529,5530,5529,5528,5532,5532,5532);
  DELETE FROM `revision` WHERE rev_text_id IN(9918,9921,9917,9919,9920,9916,9922,9915,9923);
  DELETE FROM `text` WHERE old_id IN(9918,9921,9917,9919,9920,9916,9922,9915,9923);
COMMIT;

この後、この管理スクリプトを使って掃除のようなことができます。

php maintenance/deleteOrphanedRevisions.php

関連項目