Manual:Querycachetwo table

Table used for caching expensive grouped queries that need two links (for example double-redirects).

DESCRIBE mw_querycachetwo; in version 1.9 gives the following: mysql> describe mw_querycachetwo; +--+-+--+-+-+---+ +--+-+--+-+-+---+ +--+-+--+-+-+---+ 6 rows in set (0.01 sec)
 * 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)       | NO   |     | NULL    |       |
 * qcc_namespacetwo | int(11)        | NO   |     | 0       |       |
 * qcc_titletwo    | char(255)       | NO   |     | NULL    |       |