Manual:querycache table

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Manual:Contents MediaWiki database layout querycache table


MediaWiki version: 1.3

The querycache table is used for caching expensive grouped queries. This table is populated with the updateSpecialPages.php maintenance script.

Fields[edit]

qc_type[edit]

A key name, generally the base name of the special page.

qc_value[edit]

Some sort of stored value. Sizes, counts...

qc_namespace[edit]

Target namespace. Used in conjunction with qc_title.

qc_title[edit]

Target title. Used in conjunction with qc_namespace.

Schema summary[edit]

MediaWiki version: 1.11

DESCRIBE querycache;

+--------------+------------------+------+-----+---------+-------+
| Field        | Type             | Null | Key | Default | Extra |
+--------------+------------------+------+-----+---------+-------+
| qc_type      | varbinary(32)    | NO   | MUL | NULL    |       |
| qc_value     | int(10) unsigned | NO   |     | 0       |       |
| qc_namespace | int(11)          | NO   |     | 0       |       |
| qc_title     | varbinary(255)   | NO   |     |         |       |
+--------------+------------------+------+-----+---------+-------+
MediaWiki version: 1.10

DESCRIBE querycache;

+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| qc_type      | varbinary(32)       | NO   | MUL | NULL    |       |
| qc_value     | int(10) unsigned    | NO   |     | 0       |       |
| qc_namespace | int(11)             | NO   |     | 0       |       |
| qc_title     | char(255) binary    | NO   |     | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+
MediaWiki versions: 1.5 – 1.9

DESCRIBE querycache;

+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| qc_type      | char(32)            | NO   | MUL | NULL    |       |
| qc_value     | int(5) unsigned     | NO   |     | 0       |       |
| qc_namespace | int(11)             | NO   |     | 0       |       |
| qc_title     | char(255) binary    | NO   |     | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+
MediaWiki versions: 1.3 – 1.4

DESCRIBE querycache;

+--------------+---------------------+------+-----+---------+-------+
| Field        | Type                | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+-------+
| qc_type      | char(32)            | NO   | MUL | NULL    |       |
| qc_value     | int(5) unsigned     | NO   |     | 0       |       |
| qc_namespace | tinyint(2) unsigned | NO   |     | 0       |       |
| qc_title     | char(255) binary    | NO   |     | NULL    |       |
+--------------+---------------------+------+-----+---------+-------+