Manual:objectcache table

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MediaWiki database layout

objectcache table

The objectcache table is used for a few generic cache operations if not using Memcached . Its content can be deleted and excluded from backups as it will be regenerated when needed.

Fields

keyname

Unique identifier of the cached object. e.g. <instance>:user:id:<userid>

value

Cached object.

exptime

Date the cache entry should be expired, and therefore removed.

Schema summary

MediaWiki version:

≥ 1.10

DESCRIBE objectcache;

+---------+------------------+------+-----+---------+-------+
| Field   | Type             | Null | Key | Default | Extra |
+---------+------------------+------+-----+---------+-------+
| keyname | varbinary(255)   | NO   | PRI | NULL    |       |
| value   | mediumblob       | YES  |     | NULL    |       |
| exptime | datetime         | YES  | MUL | NULL    |       |
+---------+------------------+------+-----+---------+-------+

MediaWiki versions:

1.3 – 1.9

DESCRIBE objectcache;

+---------+------------------+------+-----+---------+-------+
| Field   | Type             | Null | Key | Default | Extra |
+---------+------------------+------+-----+---------+-------+
| keyname | char(255) binary | NO   | PRI | NULL    |       |
| value   | mediumblob       | YES  |     | NULL    |       |
| exptime | datetime         | YES  | MUL | NULL    |       |
+---------+------------------+------+-----+---------+-------+