inner join MySQL Profiles 三表内联查询效率优化

 
今天系统爆出一个慢SQL语句，经过分析确定查询时间过长的原因主要是数据量大三张表内联耗时较长；经过重新设计将不必要的内联逻辑排除，成功的将查询时间降低一个数量级。

原始SQL：select b.*, c.type_name from msop_t_set_storedata a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN msop_t_store_data_type c on b.data_type_id = c.Id where a.cust_num = '6009256673';
修改后：

select  b.*, c.type_name from (select data_id ,cust_num from msop_t_set_storedata where cust_num = '6009256673') a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN  msop_t_store_data_type c on b.data_type_id = c.Id;

执行效率对比：
mysql> set profiling=1;
Query OK, 0 rows affected
mysql> select b.*, c.type_name from msop_t_set_storedata a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN msop_t_store_data_type c on b.data_type_id = c.Id where a.cust_num = '6009256673';
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
| Id | data_name | data_type_id | req_url | force_show | sort_num | data_code | update_time | operator | is_new | supplierType | plugin_type_id | type_name |
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
| 13 | 今日浏览量111 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 0 | browseNum | 2016-12-15 16:09:46 | 14050313 | 1 | C,H,S | 8 | 今日数据 |
| 14 | 今日总访客数 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 1 | visitorNum | 2016-06-07 19:30:36 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
| 15 | 今日成交总金额 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 4 | dealAmount | 2016-10-28 11:04:08 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
| 17 | 今日订单数 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 7 | dealOrderNum | 2016-12-15 16:10:26 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
4 rows in set
mysql> select b.*, c.type_name from (select data_id ,cust_num from msop_t_set_storedata where cust_num = '6009256673') a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN msop_t_store_data_type c on b.data_type_id = c.Id;
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
| Id | data_name | data_type_id | req_url | force_show | sort_num | data_code | update_time | operator | is_new | supplierType | plugin_type_id | type_name |
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
| 13 | 今日浏览量111 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 0 | browseNum | 2016-12-15 16:09:46 | 14050313 | 1 | C,H,S | 8 | 今日数据 |
| 14 | 今日总访客数 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 1 | visitorNum | 2016-06-07 19:30:36 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
| 15 | 今日成交总金额 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 4 | dealAmount | 2016-10-28 11:04:08 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
| 17 | 今日订单数 | 11 | http://msoppre.cnsuning.com/msop/custview/data/index.htm | 1 | 7 | dealOrderNum | 2016-12-15 16:10:26 | 14050313 | 0 | C,H,S | 8 | 今日数据 |
+----+----------------+--------------+----------------------------------------------------------+------------+----------+--------------+---------------------+----------+--------+--------------+----------------+-----------+
4 rows in set
mysql> show profiles;
+----------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 1 | 0.001387 | select b.*, c.type_name from msop_t_set_storedata a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN msop_t_store_data_type c on b.data_type_id = c.Id where a.cust_num = '6009256673' |
| 2 | 0.00091275 | select b.*, c.type_name from (select data_id ,cust_num from msop_t_set_storedata where cust_num = '6009256673') a INNER JOIN msop_t_store_data b on a.data_id = b.Id INNER JOIN msop_t_store_data_type c on b.data_type_id = c.Id |
+----------+------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set
mysql>

优化前执行时间：0.00138700

优化后执行时间：0.00091275

            优化时间：0.00047425

            效率提升：34.19250180245133%