Created_tmp_disk_tables 的值为0
「已注销」 2010-10-20 05:42:14 mysql> show status like'%Created_tmp%';
+-------------------------+--------+
| Variable_name | Value |
+-------------------------+--------+
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 296432 |
| Created_tmp_tables | 2 |
+-------------------------+--------+
3 rows in set (0.00 sec)
这是为什么?