Question

这张表有世界上所有问题:( 搜索字段为name_ar，name_en为Query LIKE，使用字段cid，uid，sid，ssid，product_id，havproduct进行SELECT查询时速度慢 INSERT查询速度很慢我认为这个表中的索引有错误

表格创建

CREATE TABLE `eng_subjects` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `cid` int(11) NOT NULL,
  `did` int(11) NOT NULL,
  `sid` int(11) NOT NULL,
  `ssid` int(11) NOT NULL DEFAULT '0',
  `product_id` int(11) NOT NULL DEFAULT '0',
  `havproduct` int(11) NOT NULL DEFAULT '0',
  `shortcut` int(11) DEFAULT '0',
  `uid` int(11) NOT NULL,
  `ar_name` varchar(500) COLLATE utf8_unicode_ci NOT NULL,
  `en_name` varchar(500) COLLATE utf8_unicode_ci DEFAULT NULL,
  `ar_desc` longtext COLLATE utf8_unicode_ci NOT NULL,
  `en_desc` longtext COLLATE utf8_unicode_ci NOT NULL,
  `ar_pic` varchar(500) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
  `en_pic` varchar(500) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
  `video` varchar(250) COLLATE utf8_unicode_ci DEFAULT NULL,
  `piclinknews` varchar(250) COLLATE utf8_unicode_ci DEFAULT NULL,
  `active_links` int(11) NOT NULL,
  `stop_smile` int(11) NOT NULL,
  `subscribe` int(11) NOT NULL,
  `subscribe_type` int(11) NOT NULL,
  `close` int(11) NOT NULL DEFAULT '0',
  `active` int(11) NOT NULL DEFAULT '1',
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `orderBy` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `viewnum` int(11) NOT NULL DEFAULT '1',
  `updated` int(11) NOT NULL DEFAULT '0',
  `pin_from` int(11) NOT NULL DEFAULT '0',
  `pin_to` int(11) NOT NULL DEFAULT '0',
  `up_to` int(11) NOT NULL DEFAULT '0',
  `deleted` int(11) NOT NULL DEFAULT '0',
  `deleted_reason` varchar(250) CHARACTER SET utf8 NOT NULL DEFAULT 'not Deleted',
  `average_price` float NOT NULL DEFAULT '0',
  `last_update` varchar(50) COLLATE utf8_unicode_ci NOT NULL DEFAULT '0000-00-00 00:00:00',
  `country_id` int(11) NOT NULL,
  `discomment` int(11) NOT NULL,
  `user_active` tinyint(4) NOT NULL DEFAULT '1',
  `dep_active` tinyint(4) NOT NULL DEFAULT '1',
  PRIMARY KEY (`id`),
  KEY `subject_idx_did` (`did`),
  KEY `idx_uid` (`uid`),
  KEY `idx_cid` (`cid`),
  KEY `idx_pin2` (`sid`,`deleted`,`pin_to`,`close`),
  KEY `engine4_subject_date` (`date`),
  KEY `idx_cid2` (`cid`,`deleted`,`close`),
  KEY `engine4_subject1` (`product_id`,`deleted`),
  KEY `idx_prodid1` (`product_id`,`deleted`)
) ENGINE=InnoDB AUTO_INCREMENT=22383826 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

查询插入

INSERT INTO eng_subjects (`ar_name`,`en_name`,`video`,`piclinknews`,`ar_desc`,`en_desc`,`country_id`,`active_links`,`stop_smile`,`subscribe`,`subscribe_type`,`shortcut`,`cid`,`did`,`sid`,`ssid`,`orderBy`,`discomment`,`uid`) 
VALUES ('test title','test title','','','testing content','testing content','62','','','','','','24','26','437','0','2014-07-26 11:08:40','0','1165262')

结果插入 http://i.stack.imgur.com/MEyPB.png

查询选择

select * from `eng_subjects` WHERE `cid` = 24 and active = 1 and `deleted` = 0 order by id desc LIMIT 30

解释

id  select_type table       type    possible_keys       key     key_len ref     rows    Extra
1   SIMPLE      eng_subjects ref    idx_cid,idx_cid2    idx_cid 4       const   205438  Using where

每次访问此主题时，此表都会在字段views中进行更新我认为复制结构和创建具有相同名称的新表并将所有数据移动到新表并删除旧表中的所有索引但是在此表中添加索引的最佳方法是什么。

我认为添加剂的问题很慢，因为大量的索引不好的东西..删除所有索引怎么样？

Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment eng_subjects 0 PRIMARY 1 id A 196089 NULL NULL BTREE eng_subjects 1 subject_idx_did 1 did A 3 NULL NULL BTREE eng_subjects 1 idx_uid 1 uid A 49022 NULL NULL BTREE eng_subjects 1 idx_pin2 1 sid A 139 NULL NULL BTREE eng_subjects 1 idx_pin2 2 deleted A 338 NULL NULL BTREE eng_subjects 1 idx_pin2 3 pin_to A 1203 NULL NULL BTREE eng_subjects 1 idx_pin2 4 close A 1474 NULL NULL BTREE eng_subjects 1 engine4_subject_date 1 date A 196089 NULL NULL BTREE eng_subjects 1 engine4_subject1 1 product_id A 4 NULL NULL BTREE eng_subjects 1 engine4_subject1 2 deleted A 4 NULL NULL BTREE eng_subjects 1 idx_prodid1 1 product_id A 4 NULL NULL BTREE eng_subjects 1 idx_prodid1 2 deleted A 4 NULL NULL BTREE eng_subjects 1 idx_for_qry 1 cid A 100 NULL NULL BTREE eng_subjects 1 idx_for_qry 2 active A 100 NULL NULL BTREE eng_subjects 1 idx_for_qry 3 deleted A 100 NULL NULL BTREE

Answer 1

也许尝试使用此键：

KEY `idx_for_qry` (`cid`,`active `,`deleted`)

并删除'idx_cid'，因为如果你有一个复合键，那么键的第一个字段就是索引

索引出错，所有查询都很慢

1 个答案: