Manual:Job table

Jobs performed by parallel apache threads or a command-line daemon.

job_id
Primary key.

job_cmd
Command name, limited to 60 characters to prevent key length overflow.

job_namespace
Namespace to act on. Should be 0 if the command does not operate on a title. Used in conjunction with.

job_title
Title to act on. Should be empty if the command does not operate on a title. Used in conjunction with job_namespace.

job_timestamp
Timestamp of when the job was inserted. NULL for jobs added before addition of the timestamp.

job_params
Any other parameters to the command. Stored as a PHP serialized array, or an empty string if there are no parameters.

job_random
Random, non-unique, number used for concurrent job acquisition.

job_attempts
The number of times this job has been locked.

job_token
Field that conveys process locks on rows via process UUIDs.

job_token_timestamp
Timestamp when the job was locked.

job_sha1
Base 36 SHA1 of the job parameters relevant to detecting duplicates.

Versions
mysql> describe job; +-+--+--+-+-++ +-+--+--+-+-++ +-+--+--+-+-++ 11 rows in set (0.00 sec)
 * Field              | Type             | Null | Key | Default | Extra          |
 * job_id             | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
 * job_cmd            | varbinary(60)    | NO   | MUL |         |                |
 * job_namespace      | int(11)          | NO   |     | NULL    |                |
 * job_title          | varbinary(255)   | NO   |     | NULL    |                |
 * job_timestamp      | varbinary(14)    | YES  | MUL | NULL    |                |
 * job_params         | blob             | NO   |     | NULL    |                |
 * job_random         | int(10) unsigned | NO   |     | 0       |                |
 * job_attempts       | int(10) unsigned | NO   |     | 0       |                |
 * job_token          | varbinary(32)    | NO   |     |         |                |
 * job_token_timestamp | varbinary(14)   | YES  |     | NULL    |                |
 * job_sha1           | varbinary(32)    | NO   | MUL |         |                |

mysql> describe job; +---+--+--+-+-++ +---+--+--+-+-++ +---+--+--+-+-++
 * Field        | Type             | Null | Key | Default | Extra          |
 * job_id       | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
 * job_cmd      | varbinary(60)    | NO   | MUL |         |                |
 * job_namespace | int(11)         | NO   |     | NULL    |                |
 * job_title    | varbinary(255)   | NO   |     | NULL    |                |
 * job_timestamp | varbinary(14)   | YES  | MUL | NULL    |                |
 * job_params   | blob             | NO   |     | NULL    |                |

+---+--+--+-+-++ +---+--+--+-+-++ +---+--+--+-+-++
 * Field        | Type             | Null | Key | Default | Extra          |
 * job_id       | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
 * job_cmd      | varbinary(60)    | NO   | MUL | NULL    |                |
 * job_namespace | int(11)         | NO   |     | NULL    |                |
 * job_title    | varbinary(255)   | NO   |     | NULL    |                |
 * job_params   | blob             | NO   |     | NULL    |                |

+---+--+--+-+-++ +---+--+--+-+-++ +---+--+--+-+-++
 * Field        | Type             | Null | Key | Default | Extra          |
 * job_id       | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
 * job_cmd      | varbinary(60)    | NO   | MUL | NULL    |                |
 * job_namespace | int(11)         | NO   |     | NULL    |                |
 * job_title    | varchar(255)     | NO   |     | NULL    |                |
 * job_params   | blob             | NO   |     | NULL    |                |

+---+-+--+-+-++ +---+-+--+-+-++ +---+-+--+-+-++
 * Field        | Type            | Null | Key | Default | Extra          |
 * job_id       | int(9) unsigned | NO   | PRI | NULL    | auto_increment |
 * job_cmd      | varchar(255)    | NO   | MUL | NULL    |                |
 * job_namespace | int(11)        | NO   |     | NULL    |                |
 * job_title    | varchar(255)    | NO   |     | NULL    |                |
 * job_params   | blob            | NO   |     | NULL    |                |