大约条数

mysql> desc select count(*) from game_online_overload;
+----+-------------+----------------------+-------+---------------+------+---------+------+-----------+-------------+
| id | select_type | table                | type  | possible_keys | key  | key_len | ref  | rows      | Extra       |
+----+-------------+----------------------+-------+---------------+------+---------+------+-----------+-------------+
|  1 | SIMPLE      | game_online_overload | index | NULL          | dsg  | 774     | NULL | 247842032 | Using index |
+----+-------------+----------------------+-------+---------------+------+---------+------+-----------+-------------+
1 row in set (0.02 sec)

占用空间
mysql> select TABLE_NAME,sum(DATA_LENGTH)+sum(INDEX_LENGTH) as size from information_schema.TABLES where TABLE_SCHEMA='hlogdb' group by TABLE_NAME order by size desc;
+-------------------------+------------+
| TABLE_NAME              | size       |
+-------------------------+------------+
| game_online_mps         | 2498658304 |

结果：

mysql> truncate table game_online_overload;
Query OK, 0 rows affected (11.51 sec)