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Information Schema PROCESSLIST Table

The Information Schema PROCESSLIST table contains information about running threads.

Similar information can also be returned with the SHOW [FULL] PROCESSLIST statement, or the mysqladmin processlist command.

It contains the following columns:

Column	Description	Added
`ID`	Connection identifier.
`USER`	MariaDB User.
`HOST`	Connecting host.
`DB`	Default database, or `NULL` if none.
`COMMAND`	Type of command running, corresponding to the `Com_` status variables. See Thread Command Values.
`TIME`	Seconds that the thread has been in its current state.
`STATE`	Current state of the thread. See Thread States.
`INFO`	Statement the thread is executing, or `NULL` if none.
`TIME_MS`	Time in milliseconds with microsecond precision that the thread has been in its current state (see more).	MariaDB 5.1
`STAGE`	The stage the process is currently in.	MariaDB 5.3
`MAX_STAGE`	The maximum number of stages.	MariaDB 5.3
`PROGRESS`	The progress of the process within the current stage (0-100%).	MariaDB 5.3
`MEMORY_USED`	Memory in bytes used by the thread.	MariaDB 10.0.1
`EXAMINED_ROWS`	Rows examined by the thread. Only updated by UPDATE, DELETE, and similar statements. For SELECT and other statements, the value remains zero.	MariaDB 10.0.1
`QUERY_ID`	Query ID.	MariaDB 10.0.5
`INFO_BINARY`	Binary data information	MariaDB 10.1.5

Note that as a difference to MySQL, in MariaDB the TIME column (and also the TIME_MS column) are not affected by any setting of @TIMESTAMP. This means that it can be reliably used also for threads that change @TIMESTAMP (such as the replication SQL thread). See also MySQL Bug #22047.

As a consequence of this, the TIME column of SHOW FULL PROCESSLIST and INFORMATION_SCHEMA.PROCESSLIST can not be used to determine if a slave is lagging behind. For this, use instead the Seconds_Behind_Master column in the output of SHOW SLAVE STATUS.

Note that the PROGRESS field from the information schema, and the PROGRESS field from SHOW PROCESSLIST display different results. SHOW PROCESSLIST shows the total progress, while the information schema shows the progress for the current stage only.. To retrieve a similar "total" Progress value from information_schema.PROCESSLIST as the one from SHOW PROCESSLIST, use

SELECT CASE WHEN Max_Stage < 2 THEN Progress ELSE (Stage-1)/Max_Stage*100+Progress/Max_Stage END 
  AS Progress FROM INFORMATION_SCHEMA.PROCESSLIST;

Example

SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST\G
*************************** 1. row ***************************
           ID: 9
         USER: msandbox
         HOST: localhost
           DB: NULL
      COMMAND: Query
         TIME: 0
        STATE: Filling schema table
         INFO: SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST
      TIME_MS: 0.351
        STAGE: 0
    MAX_STAGE: 0
     PROGRESS: 0.000
  MEMORY_USED: 85392
EXAMINED_ROWS: 0
     QUERY_ID: 15
  INFO_BINARY: SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST
          TID: 11838
*************************** 2. row ***************************
           ID: 5
         USER: system user
         HOST: 
           DB: NULL
      COMMAND: Daemon
         TIME: 0
        STATE: InnoDB shutdown handler
         INFO: NULL
      TIME_MS: 0.000
        STAGE: 0
    MAX_STAGE: 0
     PROGRESS: 0.000
  MEMORY_USED: 24160
EXAMINED_ROWS: 0
     QUERY_ID: 0
  INFO_BINARY: NULL
          TID: 3856
...

Information Schema PROCESSLIST Table

Example

See Also