mysql> SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
Query OK, 0 rows affected (0.01 sec)

mysql> START TRANSACTION;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT * FROM users;
+----+---------+
| id | name    |
+----+---------+
|  1 | TungNT  |
|  2 | VienLD  |
|  3 | CuongPT |
+----+---------+
3 rows in set (0.01 sec)