慢MySQL查询与内部联接0846秒

此查询

SELECT * 
FROM `engine4_product_file` INNER JOIN 
    `engine4_file` 
    ON engine4_product_file.fid = engine4_file.id 
WHERE engine4_product_file.pid IN (3347,3346,3345,3343,3342,3337) and 
     engine4_file.active = 1 AND 
     engine4_file.ext IN ('jpg','gif','png','jpeg')

这创建表engine4_product_file

CREATE TABLE `engine4_product_file` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `fid` int(11) NOT NULL, 
    `pid` int(11) NOT NULL, 
    PRIMARY KEY (`id`), 
    KEY `engine4_product_file` (`fid`), 
    KEY `pid` (`pid`) 
) ENGINE=InnoDB AUTO_INCREMENT=6549 DEFAULT CHARSET=latin1

，这创造table engine4_file

CREATE TABLE `engine4_file` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `uid` int(11) NOT NULL, 
    `name` longtext CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, 
    `url` longtext CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, 
    `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    `active` int(11) NOT NULL DEFAULT '1', 
    `size` int(11) DEFAULT NULL, 
    `ext` varchar(10) DEFAULT NULL, 
    `folder` int(11) NOT NULL DEFAULT '0', 
    PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=48801 DEFAULT CHARSET=latin1

这个解释

id select_type  table type possible_keys key  key_len  ref  rows Extra 
1 SIMPLE engine4_product_file range engine4_product_file,pid pid  4 NULL 30 Using where 
1 SIMPLE engine4_file eq_ref PRIMARY  PRIMARY  4 akafine_social2.engine4_product_file.fid 1 Using where

来源

2014-09-28 GoldenFingers

无论你的表有相同的名字？哪个是哪个？还有什么'的问题，我只看到30行，真的很慢吗？ – Mihai 2014-09-28 16:56:21

我觉得有一个cut'n'paste错误，因为你添加了两次相同的表。 – 2014-09-28 17:01:16

我只想获得为这个表添加索引的最佳方式 – GoldenFingers 2014-09-30 00:00:03

更改您的WHERE条件

WHERE engine4_file.active = 1 AND 
     engine4_file.ext IN ('jpg','gif','png','jpeg') AND 
    engine4_product_file.pid IN (3347,3346,3345,3343,3342,3337)

添加一个索引

ALTER TABLE engine4_file ADD KEY (active,ext)

来源

2014-09-30 00:12:44 Mihai

慢MySQL查询与内部联接0846秒

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