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{"id":581,"date":"2018-01-06T10:01:27","date_gmt":"2018-01-06T10:01:27","guid":{"rendered":"http:\/\/minervadb.com\/?p=581"},"modified":"2018-03-11T18:31:45","modified_gmt":"2018-03-11T18:31:45","slug":"mass-killing-of-mysql-connections-processes","status":"publish","type":"post","link":"http:\/\/minervadb.com\/index.php\/2018\/01\/06\/mass-killing-of-mysql-connections-processes\/","title":{"rendered":"Mass killing of MySQL connections \/ processes"},"content":{"rendered":"

Sometimes we may have to kill several MySQL connections \/ processes, How can we do that effortlessly ? We have to first list down the connections you want to kill with ” SHOW FULL PROCESSLIST ” (Query 1<\/strong> ), The Query 2<\/strong> below will do mass killing MySQL connections \/ processes quickly .<\/p>\n

Query 1\r\n\r\nmysql> SHOW FULL PROCESSLIST\\G;\r\n\r\n*************************** 1. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 3\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: NULL\r\n\r\nCommand: Query\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State: NULL\r\n\r\n\u00a0\u00a0 Info: SHOW FULL PROCESSLIST\r\n\r\n*************************** 2. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 15008\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Sleep\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State:\u00a0\r\n\r\n\u00a0\u00a0 Info: NULL\r\n\r\n*************************** 3. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 19759\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Query\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State: query end\r\n\r\n\u00a0\u00a0 Info: INSERT INTO t1 VALUES (95275444,'bNIrBDBl81tjzdvuOpQRCXgX37xGtzLKEXBIcE3k7xK7aFtqxC99jqYnpTviK83bf6lGDgsKd4R3KLmHPnI8TqnIKj1gjw7N2sXFZNS2Svyg8cpZN7atxL39w4igsp')\r\n\r\n*************************** 4. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 19760\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Sleep\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State:\u00a0\r\n\r\n\u00a0\u00a0 Info: NULL\r\n\r\n*************************** 5. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 19761\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Query\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State: query end\r\n\r\n\u00a0\u00a0 Info: INSERT INTO t1 VALUES (95275444,'bNIrBDBl81tjzdvuOpQRCXgX37xGtzLKEXBIcE3k7xK7aFtqxC99jqYnpTviK83bf6lGDgsKd4R3KLmHPnI8TqnIKj1gjw7N2sXFZNS2Svyg8cpZN7atxL39w4igsp')\r\n\r\n*************************** 6. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 19762\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Query\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State: query end\r\n\r\n\u00a0\u00a0 Info: INSERT INTO t1 VALUES (95275444,'bNIrBDBl81tjzdvuOpQRCXgX37xGtzLKEXBIcE3k7xK7aFtqxC99jqYnpTviK83bf6lGDgsKd4R3KLmHPnI8TqnIKj1gjw7N2sXFZNS2Svyg8cpZN7atxL39w4igsp')\r\n\r\n*************************** 7. row ***************************\r\n\r\n\u00a0\u00a0 \u00a0 Id: 19763\r\n\r\n\u00a0\u00a0 User: root\r\n\r\n\u00a0\u00a0 Host: localhost\r\n\r\n\u00a0\u00a0 \u00a0 db: mysqlslap\r\n\r\nCommand: Query\r\n\r\n\u00a0\u00a0 Time: 0\r\n\r\n\u00a0 State: query end\r\n\r\n\u00a0\u00a0 Info: INSERT INTO t1 VALUES (95275444,'bNIrBDBl81tjzdvuOpQRCXgX37xGtzLKEXBIcE3k7xK7aFtqxC99jqYnpTviK83bf6lGDgsKd4R3KLmHPnI8TqnIKj1gjw7N2sXFZNS2Svyg8cpZN7atxL39w4igsp')\r\n<\/pre>\n

The query below get you the script for mass killing of \u00a0MySQL in one key stroke , I usually use this when I am suspecting something unacceptable is happening in MySQL.<\/p>\n

Query 2\r\nmysql> select concat('KILL ',id,';') from information_schema.processlist where user='root';\r\n\r\n+------------------------+\r\n\r\n| concat('KILL ',id,';') |\r\n\r\n+------------------------+\r\n\r\n| KILL 21159;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21158;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21157;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21156;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21155;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21154;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21153;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21152;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21151;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21150;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21149;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21148;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21147;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21146;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21145;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21144;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21143;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21142;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21141;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n\r\n| KILL 21140;\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 |\r\n<\/pre>\n

 <\/p>\n

mysql> select concat('KILL ',id,';') from information_schema.processlist where user='root' into outfile '\/var\/lib\/mysql-files\/kill-mysql-conn.txt';\r\n\r\nQuery OK, 1 row affected (0.00 sec)\r\n\r\nmysql> source \/var\/lib\/mysql-files\/kill-mysql-conn.txt<\/pre>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Sometimes we may have to kill several MySQL connections \/ processes, How can we do that effortlessly ? We have to first list down the connections you want to kill with ” SHOW FULL PROCESSLIST […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41,2,3,37,42],"tags":[6,43,44],"yoast_head":"\nEnterprise-class Consulting, 24*7 Support and Remote DBA Services for MySQL, MariaDB, PostgreSQL and ClickHouse<\/title>\n<meta name=\"description\" content=\"Independent and vendor neutral consulting, support and remote DBA services for MySQL, MariaDB, PostgreSQL and ClickHouse with core expertize in Performance, Scalability, High Availability and Database Reliability Engineering\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/minervadb.com\/index.php\/2018\/01\/06\/mass-killing-of-mysql-connections-processes\/\" \/>\n<meta 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