SHOW VARIABLES LIKE '%max_connections%';
SHOW GLOBAL STATUS LIKE 'Max_used_connections';
SELECT concat('KILL ',id,';') FROM information_schema.processlist
WHERE USER IN('a','b')
AND TIME >20
AND state IN('Sending DATA','statistics','Creating sort index');
SELECT * FROM information_schema.processlist WHERE USER IN('a','b') AND TIME >20 ;
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