# bool global --source include/have_maria.inc SET @start_global_value = @@global.encrypt_tmp_disk_tables; # # exists as global only # select @@global.encrypt_tmp_disk_tables; --error ER_INCORRECT_GLOBAL_LOCAL_VAR select @@session.encrypt_tmp_disk_tables; show global variables like 'encrypt_tmp_disk_tables'; show session variables like 'encrypt_tmp_disk_tables'; select * from information_schema.global_variables where variable_name='encrypt_tmp_disk_tables'; select * from information_schema.session_variables where variable_name='encrypt_tmp_disk_tables'; # # show that it's writable # set global encrypt_tmp_disk_tables=ON; select @@global.encrypt_tmp_disk_tables; set global encrypt_tmp_disk_tables=OFF; select @@global.encrypt_tmp_disk_tables; set global encrypt_tmp_disk_tables=1; select @@global.encrypt_tmp_disk_tables; --error ER_GLOBAL_VARIABLE set session encrypt_tmp_disk_tables=1; # # incorrect types # --error ER_WRONG_TYPE_FOR_VAR set global encrypt_tmp_disk_tables=1.1; --error ER_WRONG_TYPE_FOR_VAR set global encrypt_tmp_disk_tables=1e1; --error ER_WRONG_VALUE_FOR_VAR set global encrypt_tmp_disk_tables="foo"; SET @@global.encrypt_tmp_disk_tables = @start_global_value;