像在中型表上的查詢性能（約3m條記錄）

Question

我有一個小問題。 我有一張約有300萬個城市的表格，並且需要對其執行like查詢。

事實是，完成查詢大約需要9秒鍾。 有什么想法可以使它變得很快嗎？

查詢是：

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

Answer 1

嘗試使用FULLTEXT INDEX 。 InnoDB現在也有FULLTEXT INDEX。

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

並像這樣使用：

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

樣品

我用5000000行創建了一個簡單的示例表，這是我的結果：

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]>