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mysql> show variables like '%profiling%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| profiling              | OFF   |
| profiling_history_size | 15    |
+------------------------+-------+
2 rows in set (0.03 sec)
profiling²ÎÊýֵΪOFF£¬ËµÃ÷ûÓдò¿ª¸Ã¹¦ÄÜ¡£
profiling_history_size²ÎÊýֵΪ15±íʾ£¬¼Ç¼×î½ü15´ÎµÄ²éѯÀúÊ·¡£¸ÃÖµ¿ÉÒÔÐ޸ġ£
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mysql> set profiling=1;
Query OK, 0 rows affected (0.00 sec)
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mysql> show variables like '%profiling%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| profiling              | ON    |
| profiling_history_size | 15    |
+------------------------+-------+
2 rows in set (0.00 sec)
profilingֵΪON˵Ã÷ÒѾ­Æô¶¯¸Ã¹¦ÄÜ¡£
ϱß˵˵ÈçºÎʹÓÃshow profiles;
1.Ê×ÏÈÖ´ÐÐÒ»²éѯÓï¾ä£º
mysql> select * from user;
+------+-----------+
| id   | name      |
+------+-----------+
|   22 | abc       |
|  223 | dabc      |
| 2232 | dddabc    |
|   45 | asdsagd   |
|   23 |


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