SET @start_global_value = @@global.innodb_file_format_check; SELECT @start_global_value; @start_global_value 1 Valid values are 'ON' and 'OFF' SELECT @@global.innodb_file_format_check in (0, 1); @@global.innodb_file_format_check in (0, 1) 1 SELECT @@global.innodb_file_format_check; @@global.innodb_file_format_check 1 SELECT @@session.innodb_file_format_check; ERROR HY000: Variable 'innodb_file_format_check' is a GLOBAL variable SHOW global variables LIKE 'innodb_file_format_check'; Variable_name Value innodb_file_format_check ON SHOW session variables LIKE 'innodb_file_format_check'; Variable_name Value innodb_file_format_check ON SELECT * FROM information_schema.global_variables WHERE variable_name='innodb_file_format_check'; VARIABLE_NAME VARIABLE_VALUE INNODB_FILE_FORMAT_CHECK ON SELECT * FROM information_schema.session_variables WHERE variable_name='innodb_file_format_check'; VARIABLE_NAME VARIABLE_VALUE INNODB_FILE_FORMAT_CHECK ON SET @@global.innodb_file_format_check='Off'; ERROR HY000: Variable 'innodb_file_format_check' is a read only variable Expected error 'Read only variable' SET @@global.innodb_file_format_check=1; ERROR HY000: Variable 'innodb_file_format_check' is a read only variable Expected error 'Read only variable' SET @@global.innodb_file_format_check=0; ERROR HY000: Variable 'innodb_file_format_check' is a read only variable Expected error 'Read only variable' SET @@global.innodb_file_format_check='On'; ERROR HY000: Variable 'innodb_file_format_check' is a read only variable Expected error 'Read only variable' SET session innodb_large_prefix='OFF'; ERROR HY000: Variable 'innodb_large_prefix' is a GLOBAL variable and should be set with SET GLOBAL SET @@session.innodb_stats_on_metadata='ON'; ERROR HY000: Variable 'innodb_stats_on_metadata' is a GLOBAL variable and should be set with SET GLOBAL SELECT IF(@@GLOBAL.innodb_file_format_check, "ON", "OFF") = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='innodb_file_format_check'; IF(@@GLOBAL.innodb_file_format_check, "ON", "OFF") = VARIABLE_VALUE 1 1 Expected SELECT COUNT(@@GLOBAL.innodb_file_format_check); COUNT(@@GLOBAL.innodb_file_format_check) 1 1 Expected SELECT COUNT(VARIABLE_VALUE) FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='innodb_file_format_check'; COUNT(VARIABLE_VALUE) 1 1 Expected SELECT @@innodb_file_format_check = @@GLOBAL.innodb_file_format_check; @@innodb_file_format_check = @@GLOBAL.innodb_file_format_check 1 1 Expected SELECT COUNT(@@innodb_file_format_check); COUNT(@@innodb_file_format_check) 1 1 Expected SELECT COUNT(@@local.innodb_file_format_check); ERROR HY000: Variable 'innodb_file_format_check' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@SESSION.innodb_file_format_check); ERROR HY000: Variable 'innodb_file_format_check' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@GLOBAL.innodb_file_format_check); COUNT(@@GLOBAL.innodb_file_format_check) 1 1 Expected SELECT innodb_file_format_check = @@SESSION.innodb_file_format_check; ERROR 42S22: Unknown column 'innodb_file_format_check' in 'field list' Expected error 'Readonly variable'