querycache_info table contains details of updates to cached special pages.
+---------------+---------------+------+-----+----------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+---------------+------+-----+----------------+-------+
| qci_type | varbinary(32) | NO | PRI | NULL | |
| qci_timestamp | char(14) | NO | | 19700101000000 | |
+---------------+---------------+------+-----+----------------+-------+
+---------------+-------------+------+-----+----------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+----------------+-------+
| qci_type | varchar(32) | NO | PRI | NULL | |
| qci_timestamp | char(14) | NO | | 19700101000000 | |
+---------------+-------------+------+-----+----------------+-------+
+---------------+-------------+------+-----+----------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+----------------+-------+
| qci_type | varchar(32) | NO | PRI | NULL | |
| qci_timestamp | binary(14) | NO | | 19700101000000 | |
+---------------+-------------+------+-----+----------------+-------+
+---------------+-------------+------+-----+----------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+----------------+-------+
| qci_type | varchar(32) | NO | PRI | NULL | |
| qci_timestamp | char(14) | NO | | 19700101000000 | |
+---------------+-------------+------+-----+----------------+-------+
DESCRIBE querycache_info; in MediaWiki 1.8 gives the following:
+---------------+-------------+------+-----+----------------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+----------------+-------+
| qci_type | varchar(32) | NO | PRI | NULL | |
| qci_timestamp | char(14) | NO | | 19700101000000 | |
+---------------+-------------+------+-----+----------------+-------+