Manual:Querycache table

Table used for caching expensive grouped queries.

describe querycache; +--+-+--+-+-+---+ | Field       | Type                | Null | Key | Default | Extra | +--+-+--+-+-+---+ | qc_type     | char(32)            |      | MUL |         |       | | qc_value    | int(5) unsigned     |      |     | 0       |       | | qc_namespace | tinyint(2) unsigned |     |     | 0       |       | | qc_title    | char(255) binary    |      |     |         |       | +--+-+--+-+-+---+

describe querycache; in MediaWiki 1.8 gives the following: +--+-+--+-+-+---+ +--+-+--+-+-+---+ +--+-+--+-+-+---+
 * 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)       | NO   |     | NULL    |       |

mysql> describe mw_querycache; +--+-+--+-+-+---+ +--+-+--+-+-+---+ +--+-+--+-+-+---+ 4 rows in set (0.00 sec)
 * 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)       | NO   |     | NULL    |       |