1select @@global.skip_external_locking; 2@@global.skip_external_locking 31 4select @@session.skip_external_locking; 5ERROR HY000: Variable 'skip_external_locking' is a GLOBAL variable 6show global variables like 'skip_external_locking'; 7Variable_name Value 8skip_external_locking ON 9show session variables like 'skip_external_locking'; 10Variable_name Value 11skip_external_locking ON 12select * from information_schema.global_variables where variable_name='skip_external_locking'; 13VARIABLE_NAME VARIABLE_VALUE 14SKIP_EXTERNAL_LOCKING ON 15select * from information_schema.session_variables where variable_name='skip_external_locking'; 16VARIABLE_NAME VARIABLE_VALUE 17SKIP_EXTERNAL_LOCKING ON 18set global skip_external_locking=1; 19ERROR HY000: Variable 'skip_external_locking' is a read only variable 20set session skip_external_locking=1; 21ERROR HY000: Variable 'skip_external_locking' is a read only variable 22