select @@global.innodb_use_fallocate;
@@global.innodb_use_fallocate
0
select @@session.innodb_use_fallocate;
ERROR HY000: Variable 'innodb_use_fallocate' is a GLOBAL variable
show global variables like 'innodb_use_fallocate';
Variable_name	Value
innodb_use_fallocate	OFF
show session variables like 'innodb_use_fallocate';
Variable_name	Value
innodb_use_fallocate	OFF
select * from information_schema.global_variables where variable_name='innodb_use_fallocate';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_USE_FALLOCATE	OFF
select * from information_schema.session_variables where variable_name='innodb_use_fallocate';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_USE_FALLOCATE	OFF
set global innodb_use_fallocate=1;
ERROR HY000: Variable 'innodb_use_fallocate' is a read only variable
set session innodb_use_fallocate=1;
ERROR HY000: Variable 'innodb_use_fallocate' is a read only variable
