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--source include/not_embedded.inc SET @start_global_value = @@global.slave_checkpoint_period; SELECT @start_global_value; # # exists as global only # select @@global.slave_checkpoint_period; --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.slave_checkpoint_period; --replace_regex /[0-9]+/period/ show global variables like 'slave_checkpoint_period'; --replace_regex /[0-9]+/period/ show session variables like 'slave_checkpoint_period'; --disable_warnings --replace_regex /[0-9]+/period/ select * from information_schema.global_variables where variable_name='slave_checkpoint_period'; --replace_regex /[0-9]+/period/ select * from information_schema.session_variables where variable_name='slave_checkpoint_period'; --enable_warnings # # show that it's writable # set global slave_checkpoint_period=1; select @@global.slave_checkpoint_period; --error ER_GLOBAL_VARIABLE set session slave_checkpoint_period=1; # # incorrect types # --error ER_WRONG_TYPE_FOR_VAR set global slave_checkpoint_period=1.1; --error ER_WRONG_TYPE_FOR_VAR set global slave_checkpoint_period=1e1; --error ER_WRONG_TYPE_FOR_VAR set global slave_checkpoint_period="foo"; # # min/max values # set global slave_checkpoint_period=1; select @@global.slave_checkpoint_period; set global slave_checkpoint_period=cast(-1 as unsigned int); select @@global.slave_checkpoint_period as "truncated to the maximum"; SET @@global.slave_checkpoint_period = @start_global_value; SELECT @@global.slave_checkpoint_period;