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'
