The Information Schema PROCESSLIST table contains detailed information about running threads, including their current state and execution time.
The Information Schema PROCESSLIST table contains information about running threads.
Similar information can also be returned with the SHOW [FULL] PROCESSLIST statement, or the mariadb-admin processlist command.
It contains the following columns:
ID
Connection identifier.
USER
Note that as a difference to MySQL, in MariaDB the TIMEcolumn (and also the TIME_MS column) are not affected by any setting of . This means that it can be reliably used also for threads that change @TIMESTAMP (such as the SQL thread). See also .
As a consequence of this, the TIME column ofSHOW FULL PROCESSLIST andINFORMATION_SCHEMA.PROCESSLIST cannot be used to determine if a slave is lagging behind. For this, use instead theSeconds_Behind_Master column in the output of .
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
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MariaDB User.
HOST
The hostname from which this thread is connected.For Unix socket connections, localhost. For TCP/IP connections, the TCP port is appended (e.g. 192.168.1.17:58061 or other-host.company.com:58061). For system user, this column is blank ('').
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 spent on the current COMMAND so far.
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 spent on the current COMMAND so far (see more).
STAGE
The stage the process is currently in.
MAX_STAGE
The maximum number of stages.
PROGRESS
The progress of the process within the current stage (0-100%).
MEMORY_USED
Memory in bytes used by the thread.
MAX_MEMORY_USED
Maximum memory in bytes used by the thread.
EXAMINED_ROWS
Rows examined by the thread. Only updated by UPDATE, DELETE, and similar statements. For SELECT and other statements, the value remains zero.
SENT_ROWS
Number of rows sent by the statement being executed. From .
QUERY_ID
Query ID.
INFO_BINARY
Binary data information
TID
Thread ID (MDEV-6756)
TMP_SPACE_USED
SELECT CASE WHEN Max_Stage < 2 THEN Progress ELSE (Stage-1)/Max_Stage*100+Progress/Max_Stage END
AS Progress FROM INFORMATION_SCHEMA.PROCESSLIST;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
...