Manual:Logging table

Every edit on a mediawiki is logged. Users can see those edits on Special:Log.

+---+--+--+-+++ +---+--+--+-+++ +---+--+--+-+++
 * Field        | Type             | Null | Key | Default        | Extra          |
 * log_id       | int unsigned     | NO   | PRI |                | auto_increment |
 * log_type     | varbinary(10)    | NO   | MUL |                |                |
 * log_action   | varbinary(10)    | NO   |     |                |                |
 * log_timestamp | binary(14)      | NO   | MUL | 19700101000000 |                |
 * log_user     | int unsigned     | NO   | MUL | 0              |                |
 * log_namespace | int(11)         | NO   | MUL | 0              |                |
 * log_title    | varchar(255)     | NO   |     |                |                |
 * log_comment  | varchar(255)     | NO   |     |                |                |
 * log_params   | blob             | NO   |     |                |                |
 * log_deleted  | tinyint unsigned | NO   |     | 0              |                |

Fields
The contents of this table is what you see on the Special:Log page.

Example:


 * 14:18, 25 June 2008 Jacksprat (Talk | contribs| block) uploaded "Image:Climb.jpg" (Added this image for the climbing page)

mysql> SELECT DISTINCT log_action FROM logging; ++ ++ ++ 23 rows in set
 * log_type: The type of the log action, or the "log type". You can filter by this type on Special:Log. Typical values are: block, delete, import, makebot, move, newusers, protect, renameuser, rights, upload ("uploaded" in example)
 * log_action: The action performed. There may be multiple actions possible for a given type: for example, an entry with the type delete may have the action delete or restore, etc. Values are (as of 05:29, 6 January 2009 (UTC)):
 * log_action |
 * upload    |
 * delete    |
 * unprotect |
 * protect   |
 * restore   |
 * block     |
 * unblock   |
 * rights    |
 * move      |
 * move_redir |
 * renameuser |
 * newusers  |
 * create    |
 * grant     |
 * create2   |
 * interwiki |
 * patrol    |
 * modify    | <-- For re-protections
 * revoke    |
 * overwrite |
 * autocreate |
 * move_prot |
 * reblock   |
 * log_timestamp: the time the action was performed, in the timestamp format MediaWiki uses everywhere in the database: yyyymmddhhmmss ("14:18, 25 June 2008" in example)
 * log_user: the id of the user who performed the action. This is a reference into the user table (the user id of "Jacksprat" in example)
 * log_namespace: the namespace of the affected page. Together with log_title, this is a reference into the page table ("Image:Climb.jpg" in example)
 * Note: logging table may contain rows with log_namespace < 0:
 * Special:Renameuser with log_type and log_action being either "" or "renameuser"
 * Special:Userlogin with log_type and log_action being "newusers"


 * log_title: the title of the affected page. Together with log_namespace, this is a reference into the page table
 * log_comment: the comment given for the action; that is the upload comment for uploads, the deletion comment for deletions, etc
 * log_params: additional parameters, usually empty. For user blocks, this contains the duration of the block, in human readable form. For page moves, this contains the location the page was moved to.


 * log_id: primary key for the table.

Previous versions
+---+--+--+-+++ +---+--+--+-+++ +---+--+--+-+++
 * Field        | Type             | Null | Key | Default        | Extra          |
 * log_type     | char(10)         | NO   | MUL |                |                |
 * log_action   | char(10)         | NO   |     |                |                |
 * log_timestamp | char(14)        | NO   | MUL | 19700101000000 |                |
 * log_user     | int unsigned     | NO   | MUL | 0              |                |
 * log_namespace | int(11)         | NO   | MUL | 0              |                |
 * log_title    | varchar(255)     | NO   |     |                |                |
 * log_comment  | varchar(255)     | NO   |     |                |                |
 * log_params   | blob             | NO   |     |                |                |

+---+--+--+-+++ +---+--+--+-+++ +---+--+--+-+++
 * Field        | Type             | Null | Key | Default        | Extra          |
 * log_type     | char(10)         | NO   | MUL |                |                |
 * log_action   | char(10)         | NO   |     |                |                |
 * log_timestamp | char(14)        | NO   |     | 19700101000000 |                |
 * log_user     | int unsigned     | NO   | MUL | 0              |                |
 * log_namespace | int(11)         | NO   | MUL | 0              |                |
 * log_title    | varchar(255)     | NO   |     |                |                |
 * log_comment  | varchar(255)     | NO   |     |                |                |
 * log_params   | blob             | NO   |     |                |                |