sql - 缓慢的 mysql 查询。有小费吗？

Question

我有以下查询...它有效但运行速度极慢。希望有人能给我一些改进执行时间的技巧吗？

SELECT tb_clients.*, tb_clients_phone_fax.*
FROM tb_clients, tb_clients_phone_fax
WHERE tb_clients.client_id=tb_clients_phone_fax.client_id
AND MATCH (client_company,client_description,client_keywords) AGAINST ('test') > 0
AND CONCAT(client_address,' ',client_city,', ',client_state,' ',client_zip) LIKE '%brooklyn%'
LIMIT 10;

编辑:

这是表格信息:

CREATE TABLE `tb_clients` (
  `client_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `client_company` varchar(254) NOT NULL,
  `client_address` varchar(254) NOT NULL,
  `client_street` varchar(254) NOT NULL,
  `client_city` varchar(254) NOT NULL,
  `client_state` varchar(254) NOT NULL,
  `client_zip` varchar(45) NOT NULL,
  `client_email` varchar(254) NOT NULL,
  `client_website` varchar(254) NOT NULL,
  `client_description` text NOT NULL,
  `client_keywords` text NOT NULL,
  PRIMARY KEY (`client_id`) USING BTREE,
  FULLTEXT KEY `client_company` (`client_company`,`client_description`,`client_keywords`)
) ENGINE=MyISAM AUTO_INCREMENT=68347 DEFAULT CHARSET=latin1;

和

CREATE TABLE `tb_clients_phone_fax` (
  `client_phone_fax_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `client_id` int(11) unsigned NOT NULL,
  `client_phone_1` varchar(45) NOT NULL,
  `client_phone_2` varchar(45) NOT NULL,
  `client_phone_3` varchar(45) NOT NULL,
  `client_fax_1` varchar(45) NOT NULL,
  `client_fax_2` varchar(45) NOT NULL,
  `client_fax_3` varchar(45) NOT NULL,
  PRIMARY KEY (`client_phone_fax_id`) USING BTREE
) ENGINE=MyISAM AUTO_INCREMENT=33944 DEFAULT CHARSET=latin1 ROW_FORMAT=DYNAMIC;

Answer 1

tb_clients.client_id 和 tb_clients_phone_fax.client_id 应该被索引。

但主要问题似乎是两个字符串比较，MATCH 和 LIKE 与 CONCAT。你确定周围没有其他 war 吗？比如，避免在执行 LIKE 语句之前连接所有地址字段？

更新: tb_clients_phone_fax.client_id 似乎没有编入索引，如果编入索引会提高性能。