stop slave; drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; reset master; reset slave; drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9; start slave; select * from Information_schema.GLOBAL_VARIABLES where variable_name like 'report_host'; VARIABLE_NAME VARIABLE_VALUE REPORT_HOST 127.0.0.1 select * from Information_schema.GLOBAL_VARIABLES where variable_name like 'report_port'; VARIABLE_NAME VARIABLE_VALUE REPORT_PORT 9308 select * from Information_schema.GLOBAL_VARIABLES where variable_name like 'report_user'; VARIABLE_NAME VARIABLE_VALUE REPORT_USER my_user select * from Information_schema.GLOBAL_VARIABLES where variable_name like 'report_password'; VARIABLE_NAME VARIABLE_VALUE REPORT_PASSWORD my_password show global variables like 'report_host'; Variable_name report_host Value 127.0.0.1 show global variables like 'report_port'; Variable_name report_port Value 9308 show global variables like 'report_user'; Variable_name report_user Value my_user show global variables like 'report_password'; Variable_name report_password Value my_password set @@global.report_host='my.new.address.net'; ERROR HY000: Variable 'report_host' is a read only variable end of tests