SET @start_global_value = @@global.innodb_status_output_locks; SELECT @start_global_value; @start_global_value 0 Valid values are 'ON' and 'OFF' select @@global.innodb_status_output_locks in (0, 1); @@global.innodb_status_output_locks in (0, 1) 1 select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 0 select @@session.innodb_status_output_locks; ERROR HY000: Variable 'innodb_status_output_locks' is a GLOBAL variable show global variables like 'innodb_status_output_locks'; Variable_name Value innodb_status_output_locks OFF show session variables like 'innodb_status_output_locks'; Variable_name Value innodb_status_output_locks OFF select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF set global innodb_status_output_locks='OFF'; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 0 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF set @@global.innodb_status_output_locks=1; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 1 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON set global innodb_status_output_locks=0; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 0 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF set @@global.innodb_status_output_locks='ON'; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 1 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON set session innodb_status_output_locks='OFF'; ERROR HY000: Variable 'innodb_status_output_locks' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_status_output_locks='ON'; ERROR HY000: Variable 'innodb_status_output_locks' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_status_output_locks=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_status_output_locks' set global innodb_status_output_locks=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_status_output_locks' set global innodb_status_output_locks=2; ERROR 42000: Variable 'innodb_status_output_locks' can't be set to the value of '2' NOTE: The following should fail with ER_WRONG_VALUE_FOR_VAR (BUG#50643) set global innodb_status_output_locks=-3; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 1 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS ON set global innodb_status_output_locks=DEFAULT; select @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 0 select * from information_schema.global_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF select * from information_schema.session_variables where variable_name='innodb_status_output_locks'; VARIABLE_NAME VARIABLE_VALUE INNODB_STATUS_OUTPUT_LOCKS OFF set global innodb_status_output_locks='AUTO'; ERROR 42000: Variable 'innodb_status_output_locks' can't be set to the value of 'AUTO' SET @@global.innodb_status_output_locks = @start_global_value; SELECT @@global.innodb_status_output_locks; @@global.innodb_status_output_locks 0