SELECT @@GLOBAL.innodb_undo_directory;
@@GLOBAL.innodb_undo_directory
.
. Expected
SET @@GLOBAL.innodb_undo_directory="/tmp";
ERROR HY000: Variable 'innodb_undo_directory' is a read only variable
Expected error 'Read only variable'
SELECT COUNT(@@GLOBAL.innodb_undo_directory);
COUNT(@@GLOBAL.innodb_undo_directory)
1
1 Expected
SELECT VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='innodb_undo_directory';
VARIABLE_VALUE
.
. Expected
SELECT COUNT(@@GLOBAL.innodb_undo_directory);
COUNT(@@GLOBAL.innodb_undo_directory)
1
1 Expected
SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
WHERE VARIABLE_NAME='innodb_undo_directory';
COUNT(VARIABLE_VALUE)
1
1 Expected
SELECT @@innodb_undo_directory = @@GLOBAL.innodb_undo_directory;
@@innodb_undo_directory = @@GLOBAL.innodb_undo_directory
1
1 Expected
SELECT COUNT(@@innodb_undo_directory);
COUNT(@@innodb_undo_directory)
1
1 Expected
SELECT COUNT(@@local.innodb_undo_directory);
ERROR HY000: Variable 'innodb_undo_directory' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@SESSION.innodb_undo_directory);
ERROR HY000: Variable 'innodb_undo_directory' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@GLOBAL.innodb_undo_directory);
COUNT(@@GLOBAL.innodb_undo_directory)
1
1 Expected
SELECT innodb_undo_directory = @@SESSION.innodb_undo_directory;
ERROR 42S22: Unknown column 'innodb_undo_directory' in 'field list'
Expected error 'Readonly variable'
