像在中型表（〜3m記錄）上的查詢性能

Question

我有一個小問題。我有一個約3米城市的表格，我需要在其上運行like查詢。

事情是，完成查詢大約需要9秒。任何想法我怎麼能使它非常快速？

查詢是：

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

Answer 1

嘗試使用全文索引。 InnoDB現在也有FULLTEXT INDEX。

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

，並使用這樣的：

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

樣品

我已創建一個簡單的示例表500萬行，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]>