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kdt
Asked: 2011-11-11 08:04:29 +0800 CST

Identify the PID from a MySQL connection ID?

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The output from 'mysqladmin processlist' looks like this:

+-------+------+-----------+-------+---------+------+-------------------+------------------------+
| Id    | User | Host      | db    | Command | Time | State             | Info                   |
+-------+------+-----------+-------+---------+------+-------------------+------------------------+
| 4411  | root | localhost | mydb1 | Sleep   | 86   |                   |                        |
| 12911 | root | localhost | mydb1 | Sleep   | 50   |                   |                        |
| 65142 | root | localhost | mydb1 | Query   | 4    | copy to tmp table | OPTIMIZE TABLE my_tble |
| 65428 | root | localhost |       | Query   | 0    |                   | show processlist   |
+-------+------+-----------+-------+---------+------+-------------------+------------------------+

From an 'Id' value in that table, how can I trace back to the PID of the process which created the connection, to figure out who is doing what? All the connections are via a local socket.

mysql

3 Answers

  1. I would recommend using multiple user accounts. An alternative is to keep a connection history by writing out connection id, process id, script name, and a date/time stamp to a log file or table. I don't know of any other way to track this information.

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  2. There is no such mapping in mysql.

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  3. I have answered this in my tech blog here: http://blog.fotios.org/2018/02/find-which-process-holds-particular.html

    Basically, there's two steps: 1) do a "show full processlist;" in mysql; this listing includes the port number of each socket/connection, 2) grep for that number in the "netstat -np" output

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