Question

我们在亚马逊AWS服务器上托管了一个MySQL表，在查询时有时非常慢。我正在考虑使用更好的索引和列数据类型重组表。

这是创建表结构：

SHOW CREATE TABLE export_users;

+------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table      | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| exportusers | CREATE TABLE `exportusers` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `UAccountID` varchar(50) CHARACTER SET utf8 NOT NULL,
  `ApplyURL` text,
  `CityName` varchar(64) CHARACTER SET utf8 DEFAULT NULL,
  `ClassList` text,
  `UCompanyID` varchar(20) DEFAULT NULL,
  `UContactCompany` varchar(64) CHARACTER SET utf8 DEFAULT NULL,
  `UContactEmail` varchar(512) CHARACTER SET utf8 DEFAULT NULL,
  `UContactFax` varchar(32) CHARACTER SET utf8 DEFAULT NULL,
  `UContactName` varchar(64) CHARACTER SET utf8 DEFAULT NULL,
  `UContactPhone` varchar(100) CHARACTER SET utf8 DEFAULT NULL,
  `CountryName` char(2) CHARACTER SET utf8 NOT NULL,
  `DateCreated` datetime NOT NULL,
  `DateModified` datetime NOT NULL,
  `DateSysCreated` datetime NOT NULL,
  `DateSysModified` datetime NOT NULL,
  `DegreeCode` varchar(200) DEFAULT NULL,
  `DegreeCodeDecoded` varchar(512) CHARACTER SET utf8 DEFAULT NULL,
  `DisplayCity` varchar(64) CHARACTER SET utf8 DEFAULT NULL,
  `DisplayuserID` varchar(32) CHARACTER SET utf8 DEFAULT NULL,
  `ExperienceCode` varchar(200) DEFAULT NULL,
  `ExperienceCodeDecoded` text,
  `ExternalKey` varchar(32) CHARACTER SET utf8 DEFAULT NULL,
  `GeoUSZip5` varchar(5) DEFAULT NULL,
  `HostSite` char(2) CHARACTER SET utf8 NOT NULL,
  `IndustryCode` varchar(128) CHARACTER SET utf8 DEFAULT NULL,
  `IndustryCodeDecoded` text,
  `IsBOFuser` tinyint(1) DEFAULT NULL,
  `IsDiversityuser` tinyint(1) DEFAULT NULL,
  `userID` varchar(20) NOT NULL,
  `userDesc` text,
  `userFunctionCode` text,
  `userFunctionCodeDecoded` text,
  `userReq` text,
  `userSkinDID` varchar(20) DEFAULT NULL,
  `userTitle` varchar(128) CHARACTER SET utf8 DEFAULT NULL,
  `userType` varchar(512) CHARACTER SET utf8 DEFAULT NULL,
  `userTypeDesc` text,
  `userTypeCodeDecoded` text,
  `Latitude` decimal(10,5) DEFAULT NULL,
  `Longitude` decimal(10,5) DEFAULT NULL,
  `Location` varchar(70) CHARACTER SET utf8 DEFAULT NULL,
  `ManagementCode` varchar(20) CHARACTER SET utf8 DEFAULT NULL,
  `MaximumExp` int(11) DEFAULT NULL,
  `MinimunExp` int(11) DEFAULT NULL,
  `Onet` varchar(10) DEFAULT NULL,
  `OnetTitle` text,
  `BeginDate` datetime NOT NULL,
  `EndDate` datetime NOT NULL,
  `PayBaseH` decimal(10,2) DEFAULT NULL,
  `PayBaseL` decimal(10,2) DEFAULT NULL,
  `PayBonus` decimal(10,2) DEFAULT NULL,
  `PayComm` decimal(10,2) DEFAULT NULL,
  `PayOther` varchar(64) CHARACTER SET utf8 DEFAULT NULL,
  `PayPer` varchar(8) DEFAULT NULL,
  `PayType` char(3) DEFAULT NULL,
  `PostalCode` varchar(10) DEFAULT NULL,
  `PostingPath` varchar(20) NOT NULL,
  `Relocate` tinyint(1) DEFAULT NULL,
  `RelocateOptions` varchar(5) DEFAULT NULL,
  `ScreenerID` varchar(20) DEFAULT NULL,
  `SiteID` varchar(1024) CHARACTER SET utf8 DEFAULT NULL,
  `SliceList` text,
  `StateName` char(30) CHARACTER SET utf8 DEFAULT NULL,
  `Status` varchar(50) NOT NULL,
  `TextPay` varchar(40) CHARACTER SET utf8 DEFAULT NULL,
  `TotalPay` decimal(10,2) DEFAULT NULL,
  `TownName` varchar(100) CHARACTER SET utf8 DEFAULT NULL,
  `TravelCode` varchar(200) DEFAULT NULL,
  `TravelCodeDecoded` text,
  `UpgradeList` varchar(64) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `index_jobs_on_UAccountID` (`UAccountID`),
  KEY `index_jobs_on_CountryName` (`CountryName`),
  KEY `index_jobs_on_DateCreated` (`DateCreated`),
  KEY `index_jobs_on_DateModified` (`DateModified`),
  KEY `index_jobs_on_DateSysCreated` (`DateSysCreated`),
  KEY `index_jobs_on_DateSysModified` (`DateSysModified`),
  KEY `index_jobs_on_HostSite` (`HostSite`),
  KEY `index_jobs_on_userID` (`userID`),
  KEY `index_jobs_on_BeginDate` (`BeginDate`),
  KEY `index_jobs_on_EndDate` (`EndDate`),
  KEY `index_jobs_on_PostingPath` (`PostingPath`),
  KEY `index_jobs_on_Status` (`Status`)
) ENGINE=InnoDB AUTO_INCREMENT=7907436 DEFAULT CHARSET=utf8mb4 |
+------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.27 sec)

Answer 1

考虑您的架构的Normalization。将一个非常大的实体分解成更小的相关实体将对您的查询速度产生最大的影响。

规范化涉及将表分解为更少冗余（和更小）的表，但不会丢失信息;在旧表中定义外键，引用新主键的主键。目标是隔离数据，以便可以在一个表中添加，删除和修改属性，然后使用定义的外键在数据库的其余部分传播。

加速包含大表的MySQL

1 个答案: