第一种：show profiles 之类的语句来查看
1.查一下profile是不是打开了，默认是不打开的。
mysql> show profiles;
Empty set (0.02 sec)
mysql> show variables like "%pro%";
+---------------------------+-------+
| Variable_name | Value |
+---------------------------+-------+
| profiling | OFF |
| profiling_history_size | 15 |
| protocol_version | 10 |
| slave_compressed_protocol | OFF |
+---------------------------+-------+
4 rows in set (0.00 sec)
我查看一下profiles里面没有东西，所以公司的电脑里面profile是没有打开的，我查看了一下mysql变量，果然是OFF的。
2.开启profile
mysql> set profiling=1;
Query OK, 0 rows affected (0.00 sec)
eg：
mysql> select * from test_1;
mysql> show profiles;
+----------+------------+----------------------+
| Query_ID | Duration | Query |
+----------+------------+----------------------+
| 1 | 0.84718100 | select * from test_1 |
+----------+------------+----------------------+
1 row in set (0.00 sec)
第二种：(通过时间差查看)
delimiter // set @d=now();
select * from comment;
select timestampdiff(second,@d,now());
delimiter ;
Query OK, 0 rows affected (1 min 55.58 sec)
+----------------------------------+
| timestampdiff(second, @d, now()) |
+----------------------------------+
| 2 |
+----------------------------------+
1 row in set (1 min 55.58 sec)