类似于中型表(~3m记录)的查询性能

Question

我有个小问题。我有一个大约300万座城市的表，我需要对它运行一个like查询。

问题是，大约需要9s才能完成查询。知道我怎么能很快做到这一点吗？

查询是：

SELECT * FROM `cities` WHERE name LIKE '%test%'

Answer 1

尝试使用全文索引。InnoDB现在也有全文索引。

CREATE FULLTEXT INDEX idx_name_ft ON cities  (`name`);

然后像这样使用：

SELECT * FROM cities WHERE MATCH(`name`) AGAINST('test');

样本

我创建了一个包含5000000行的简单示例表，这是我的结果：

MariaDB [yourschema]> SELECT * FROM cities WHERE `name` LIKE '%test%';
+---------+------------------------------------------------------+
| id      | name                                                 |
+---------+------------------------------------------------------+
|       7 | name of the city is test more text here              |
|    1096 | name of the city is other more text here - test      |
|    1109 | test name of the city is other more text here        |
| 4998932 | name of the city is other more text here - last test |
| 4999699 | name of the city is other more text here - test some |
| 4999997 | name of the city is - test again - more text here    |
+---------+------------------------------------------------------+
6 rows in set (4.29 sec)

MariaDB [yourschema]> SELECT * FROM cities WHERE MATCH(`name`) AGAINST('test');
+---------+------------------------------------------------------+
| id      | name                                                 |
+---------+------------------------------------------------------+
|       7 | name of the city is test more text here              |
|    1096 | name of the city is other more text here - test      |
|    1109 | test name of the city is other more text here        |
| 4998932 | name of the city is other more text here - last test |
| 4999699 | name of the city is other more text here - test some |
| 4999997 | name of the city is - test again - more text here    |
+---------+------------------------------------------------------+
6 rows in set (0.60 sec)

MariaDB [yourschema]>