Mysql Kill Process New! Info

KILL CONNECTION releases row locks rollback completes. During rollback, other transactions cannot access those rows.

Sometimes you cannot access the MySQL shell (e.g., too many connections error). You can kill processes from the OS level using the mysqladmin tool. mysql kill process

| Operation | Overhead | |-----------|----------| | Sending KILL signal | Microseconds (sets a flag) | | Target thread noticing flag | Depends on interrupt points (milliseconds to minutes) | | Transaction rollback (InnoDB) | Linear to modified rows/undo size | | Lock release | After rollback completes | KILL CONNECTION releases row locks rollback completes

SELECT CONCAT('KILL ', id, ';') FROM information_schema.processlist WHERE user = 'problem_user'; Use code with caution. Copied to clipboard You can kill processes from the OS level

Killing a query does instantly release metadata locks. The lock is held until the kill acknowledgement completes. This can cause cascading blocking: