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