Manual:querycachetwo table

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MediaWiki database layout

querycachetwo table

MediaWiki version:

≥ 1.9

The querycachetwo table is a table used for caching expensive grouped queries that need two links (for example double-redirects).

Fields[edit]

qcc_type[edit]

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

qcc_value[edit]

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

qcc_namespace[edit]

Target namespace. Used in conjunction with qcc_title.

qcc_title[edit]

Target title. Used in conjunction with qcc_namespace.

qcc_namespacetwo[edit]

Target namespace2. Used in conjunction with qcc_titletwo.

qcc_titletwo[edit]

Target title2. Used in conjunction with qcc_namespacetwo.

Schema summary[edit]

MediaWiki version:

≥ 1.11

DESCRIBE querycachetwo;

+------------------+------------------+------+-----+---------+-------+
| Field            | Type             | Null | Key | Default | Extra |
+------------------+------------------+------+-----+---------+-------+
| qcc_type         | varbinary(32)    | NO   | MUL | NULL    |       |
| qcc_value        | int(10) unsigned | NO   |     | 0       |       |
| qcc_namespace    | int(11)          | NO   |     | 0       |       |
| qcc_title        | varbinary(255)   | NO   |     |         |       |
| qcc_namespacetwo | int(11)          | NO   |     | 0       |       |
| qcc_titletwo     | varbinary(255)   | NO   |     |         |       |
+------------------+------------------+------+-----+---------+-------+

MediaWiki version:

1.10

DESCRIBE querycachetwo;

+------------------+------------------+------+-----+---------+-------+
| Field            | Type             | Null | Key | Default | Extra |
+------------------+------------------+------+-----+---------+-------+
| qcc_type         | varbinary(32)    | NO   | MUL | NULL    |       |
| qcc_value        | int(10) unsigned | NO   |     | 0       |       |
| qcc_namespace    | int(11)          | NO   |     | 0       |       |
| qcc_title        | char(255) binary | NO   |     | NULL    |       |
| qcc_namespacetwo | int(11)          | NO   |     | 0       |       |
| qcc_titletwo     | char(255) binary | NO   |     | NULL    |       |
+------------------+------------------+------+-----+---------+-------+

MediaWiki version:

1.9

DESCRIBE querycachetwo;

+------------------+------------------+------+-----+---------+-------+
| Field            | Type             | Null | Key | Default | Extra |
+------------------+------------------+------+-----+---------+-------+
| qcc_type         | char(32)         | NO   | MUL | NULL    |       |
| qcc_value        | int(5) unsigned  | NO   |     | 0       |       |
| qcc_namespace    | int(11)          | NO   |     | 0       |       |
| qcc_title        | char(255) binary | NO   |     | NULL    |       |
| qcc_namespacetwo | int(11)          | NO   |     | 0       |       |
| qcc_titletwo     | char(255) binary | NO   |     | NULL    |       |
+------------------+------------------+------+-----+---------+-------+

Indexes[edit]

MediaWiki version:

≥ 1.9

SHOW INDEX IN querycachetwo;

+---------------+------------+--------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table         | Non_unique | Key_name     | Seq_in_index | Column_name      | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+---------------+------------+--------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| querycachetwo |          1 | qcc_type     |            1 | qcc_type         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_type     |            2 | qcc_value        | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_title    |            1 | qcc_type         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_title    |            2 | qcc_namespace    | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_title    |            3 | qcc_title        | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_titletwo |            1 | qcc_type         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_titletwo |            2 | qcc_namespacetwo | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| querycachetwo |          1 | qcc_titletwo |            3 | qcc_titletwo     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+---------------+------------+--------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+