Manual:Updatelog table

A table to log updates, one text key row per update script.

ul_key
Pointer to a maintenance script, which was executed during a MediaWiki update. For update.php entries are formatted like updatelist-1.22.3-1393593680: Pointer to the maintenance script, MediaWiki version and timestamp in UNIX time.

ul_value
Serialized data; optional. Usage unknown!

Versions
(Current as of v1.22.)

mysql> describe updatelog; +--++--+-+-+---+ +--++--+-+-+---+ +--++--+-+-+---+
 * Field   | Type           | Null | Key | Default | Extra |
 * ul_key  | varbinary(255) | NO   | PRI | NULL    |       |
 * ul_value | blob          | YES  |     | NULL    |       |

DESCRIBE updatelog:

+-++--+-+-+---+ +-++--+-+-+---+ +-++--+-+-+---+
 * Field      | Type           | Null | Key | Default | Extra |
 * ul_key     | varbinary(255) | NO   | PRI |         |       |
 * ul_value   | blob           | YES  |     | NULL    |       |

DESCRIBE updatelog:

+-++--+-+-+---+ +-++--+-+-+---+ +-++--+-+-+---+
 * Field      | Type           | Null | Key | Default | Extra |
 * ul_key     | varchar(255)   | NO   | PRI |         |       |