Find Users logged into MariaDB

Question:Is there a query to run that will return all Users that are currently logged into MariaDB?

Answer: In MariaDB, there is a system table called information_schema.processlist which shows the threads that are currently running. You can run a query against this system table that returns all of the Users that are currently have a connection running in the MariaDB database.

To retrieve all Users logged into MariaDB, you can execute the following SQL statement:

SELECT SUBSTRING_INDEX(host, ':', 1) AS host_short,

       GROUP_CONCAT(DISTINCT user) AS users,

       COUNT(*) AS threads

FROM information_schema.processlist

GROUP BY host_short
ORDER BY COUNT(*), host_short;

This SELECT statement will return the host, the user, and the number of threads for that host/user combination.

TIP: You must have PROCESS privileges to see threads owned by other users. Otherwise, you will only see your own threads.

The information_schema.processlist table contains the following columns:

Column	Explanation
ID	Unique identifier
USER	User name (ie: root, fastread.aitechtonic, etc)
HOST	Host for the user
DB	Database that thread is running in
COMMAND	Command that is being run (ie: Query, Sleep, etc).
TIME	Number of seconds that thread has been running (ie: 301, 325)
STATE	State of thread (ie: executing)
INFO	Displays information about the thread. (ie: if COMMAND='Query' and STATE='executing', the SQL that the user is running will be displayed)
TIME_MS	Number of milliseconds that thread has been running (ie: 301471.887, 325595.370)
STAGE	Stage that the thread is currently in
MAX_STAGE	Maximum number of stages
PROGRESS	Progress of the current stage (ie: 10%, 95%, etc.)
MEMORY_USED	Amount of memory used by the thread (ie: 50200, 82920, etc.)
EXAMINED_ROWS	The number of rows examined by the thread
QUERY_ID	ID of the query