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SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE variable_name LIKE '%offline_mode%'; VARIABLE_NAME VARIABLE_VALUE OFFLINE_MODE OFF CREATE USER 'user1'@'localhost'; CREATE USER 'user2'@'localhost'; CREATE USER 'user3'@'localhost'; connect conu1,localhost,user1; connect conu2,localhost,user2; connect conu3,localhost,user3; connection default; SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST; COUNT(USER) 4 SHOW STATUS LIKE 'threads_connected'; Variable_name Value Threads_connected 4 SET GLOBAL offline_mode = ON; SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST; COUNT(USER) 1 SHOW STATUS LIKE 'threads_connected'; Variable_name Value Threads_connected 1 disconnect default; disconnect conu1; ERROR HY000: The server is currently in offline mode connect(conu1,localhost,user1) connect(root,localhost,root) SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST; COUNT(USER) 1 connect(default,localhost,root) SHOW VARIABLES LIKE '%offline_mode%'; Variable_name Value offline_mode ON SELECT COUNT(USER) FROM INFORMATION_SCHEMA.PROCESSLIST; COUNT(USER) 2 SHOW STATUS LIKE 'threads_connected'; Variable_name Value Threads_connected 2 DROP USER 'user1'@'localhost'; DROP USER 'user2'@'localhost'; DROP USER 'user3'@'localhost'; # Restoring the original values. SET @@global.offline_mode = 0;