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