Question

我在MySQL数据库中的InnoDB表上遇到了查询。我需要在两个文本字段上查找基于全文搜索的订单，这两个文本字段包含json编码文本中的订单和客户详细信息。这是表模式：

+--------------+------------+------+-----+---------+----------------+
| Field        | Type       | Null | Key | Default | Extra          |
+--------------+------------+------+-----+---------+----------------+
| id           | int(11)    | NO   | PRI | NULL    | auto_increment |
| user_id      | int(11)    | NO   | MUL | NULL    |                |
| comment      | text       | NO   |     | NULL    |                |
| modified     | datetime   | NO   |     | NULL    |                |
| created      | datetime   | NO   | MUL | NULL    |                |
| items        | mediumtext | NO   | MUL | NULL    |                |
| addressinfo  | text       | NO   |     | NULL    |                |
+--------------+------------+------+-----+---------+----------------+
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table  | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| orders |          0 | PRIMARY  |            1 | id          | A         |       69144 |     NULL | NULL   |      | BTREE      |         |               |
| orders |          1 | user_id  |            1 | user_id     | A         |       45060 |     NULL | NULL   |      | BTREE      |         |               |
| orders |          1 | created  |            1 | created     | A         |       69240 |     NULL | NULL   |      | BTREE      |         |               |
| orders |          1 | search   |            1 | items       | NULL      |       69240 |     NULL | NULL   |      | FULLTEXT   |         |               |
| orders |          1 | search   |            2 | addressinfo | NULL      |       69240 |     NULL | NULL   |      | FULLTEXT   |         |               |
+--------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

该表有大约150,000行。它在items和addressinfo列上有一个全文索引。

以下是查询：

SELECT 
  id
FROM 
  orders 
WHERE 
  MATCH (items, addressinfo) AGAINST (
    '+simon* +white* ' IN BOOLEAN MODE
  ) 
ORDER BY 
  id DESC 
LIMIT 
20

这是EXPLAIN结果：

+----+-------------+--------+------------+----------+---------------+--------+---------+-------+------+----------+---------------------------------------------------+
| id | select_type | table  | partitions | type     | possible_keys | key    | key_len | ref   | rows | filtered | Extra                                             |
+----+-------------+--------+------------+----------+---------------+--------+---------+-------+------+----------+---------------------------------------------------+
|  1 | SIMPLE      | orders | NULL       | fulltext | search        | search | 0       | const |    1 |   100.00 | Using where; Ft_hints: no_ranking; Using filesort |
+----+-------------+--------+------------+----------+---------------+--------+---------+-------+------+----------+---------------------------------------------------+

在大型结果集上，查询大约需要30秒才能在标准LAMP VM上进行处理。

不按

ORDER BY id DESC

排序，查询在大约0.6秒内处理得更快。

EXPLAIN结果的唯一区别是＆＃34;使用filesort＆＃34;在更快的查询中缺少。测量查询说，98％的处理时间（27s）用于＆＃34;创建排序索引＆＃34;。

有没有办法在合理的处理时间（不到一秒）内使用ORDER BY对此表进行全文搜索？

我已尝试过不同的方法，例如将列按列放入全文索引（text_id为TEXT列），没有运气。从这里开始的方法：How to make a FULLTEXT search with ORDER BY fast?也不会更快。

由于应用程序在共享主机上运行，我在优化MySQL ini值或内存值方面非常有限。

非常感谢！

Answer 1

使用已发布的表时，您可能会获得一些时间。试试吧。

<强>查询

SELECT
 orders.id
FROM (
  SELECT 
    id  
  FROM 
    orders 
  WHERE 
    MATCH (items, addressinfo) AGAINST (
      '+simon* +white* ' IN BOOLEAN MODE
    )  
) 
  AS 
    orders_match
INNER JOIN
 orders 
ON
 orders_match.id = orders.id

ORDER BY
 orders.id DESC

LIMIT 20

在MySQL DB上的其他列上使用ORDER BY进行全文搜索非常慢

1 个答案: