1create table global_priv_backup select * from mysql.global_priv; 2update mysql.global_priv set priv=json_insert(priv, '$.plugin', 'unix_socket'); 3delete from mysql.global_priv where user != 'root'; 4flush privileges; 5connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET); 6ERROR 28000: Access denied for user 'USER'@'localhost' 7ERROR 28000: Access denied for user 'USER'@'localhost' 8replace mysql.global_priv select * from global_priv_backup; 9flush privileges; 10drop table global_priv_backup; 11