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