[优化MySQL结构和查询

Question

以下查询需要70秒钟或更长时间：

SELECT 
  ShipmentHeader.RecNbr,
  ShipmentHeader.Void,
  ShipmentHeader.SONum,
  ShipmentHeader.DateofReq,
  ShipmentHeader.ShipToName,
  ShipmentHeader.ShipToCity,
  ShipmentHeader.ShipToState,
  ShipmentHeader.ShipToZip,
  ShipmentHeader.ShipToCountry
FROM
  ShipmentHeader 
  INNER JOIN ShipmentLabels 
    ON ShipmentHeader.RecNbr = ShipmentLabels.HeaderRecNbr 
order by  ShipmentHeader.RecNbr DESC

这里是表结构：

CREATE TABLE `ShipmentHeader` (
  `RecNbr` int(11) NOT NULL AUTO_INCREMENT,
  `Void` varchar(1) NOT NULL DEFAULT 'N',
  `SONum` varchar(7) NOT NULL,
  `User` varchar(6) NOT NULL,
  `DateofReq` datetime NOT NULL,
  `ShipToName` varchar(255) DEFAULT NULL,
  `ShipToAddress1` varchar(255) DEFAULT NULL,
  `ShipToAddress2` varchar(255) DEFAULT NULL,
  `ShipToAddress3` varchar(255) DEFAULT NULL,
  `ShipToCity` varchar(255) DEFAULT NULL,
  `ShipToState` varchar(255) DEFAULT NULL,
  `ShipToZip` varchar(255) DEFAULT NULL,
  `ShipToCountry` varchar(255) DEFAULT NULL,
  `PackageHeaderRecNbr` int(11) DEFAULT NULL,
  `NegotiatedShipmentCharge` decimal(10,2) DEFAULT NULL,
  `PublishedShipmentCharge` decimal(10,2) DEFAULT NULL,
  `CustomerShipmentCharge` decimal(10,2) DEFAULT NULL,
  `VoidTimeStamp` datetime DEFAULT NULL,
  `VoidUser` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`RecNbr`),
  KEY `SONum` (`SONum`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=539140 DEFAULT CHARSET=utf8

和

CREATE TABLE `ShipmentLabels` (
  `RecNbr` int(11) NOT NULL AUTO_INCREMENT,
  `Whse` varchar(3) DEFAULT NULL,
  `HeaderRecNbr` int(11) NOT NULL,
  `PackageRecNbr` int(11) NOT NULL,
  `Carrier` varchar(60) NOT NULL DEFAULT '',
  `Service` varchar(60) DEFAULT NULL,
  `Charges` decimal(10,2) NOT NULL,
  `RatedCost` decimal(10,2) NOT NULL,
  `PublishedRate` decimal(10,2) NOT NULL,
  `CustomerCharge` decimal(10,2) NOT NULL,
  `Weight` int(11) NOT NULL,
  `LabelFormat` varchar(30) NOT NULL DEFAULT '',
  `ShipmentID` varchar(60) NOT NULL,
  `TrackingNumber` varchar(60) NOT NULL DEFAULT '',
  `Label` mediumtext NOT NULL COMMENT 'Base64 Encoded',
  `DateofLabel` datetime NOT NULL,
  `LabelSource` varchar(50) DEFAULT NULL,
  `VendorServiceRecNbr` int(11) DEFAULT NULL,
  PRIMARY KEY (`RecNbr`),
  KEY `HeaderRecNbr` (`HeaderRecNbr`) USING BTREE,
  KEY `PackageRecNbr` (`PackageRecNbr`) USING BTREE,
  CONSTRAINT `ShipmentLabels_ibfk_1` FOREIGN KEY (`HeaderRecNbr`) REFERENCES `ShipmentHeader` (`RecNbr`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=542542 DEFAULT CHARSET=utf8

这里是解释：

id  select_type table   type    possible_keys   key key_len ref rows    Extra
1   SIMPLE  ShipmentHeader  index   PRIMARY PRIMARY 4       536185  
1   SIMPLE  ShipmentLabels  ref HeaderRecNbr    HeaderRecNbr    4   Shipping.ShipmentHeader.RecNbr  1   Using index

[ShipmentLabels表在每一行中都有很多数据，因为它在MediumText列“ Label”中存储了base64编码的ZPL标签。

是否有一种方法可以更快地获得相同的结果？我只需要列出ShipmentHeader记录，并在上面附加标签即可，如ShipmentLabel.HeaderRecNbr = ShipmentHeader.RecNbr。

谢谢！

Answer 1

[我的错，在这个上...但是可能对其他人有用...当我在本地运行MySQL服务器所在的同一查询时，我是通过使用Navicat的VPN连接通过VPN连接运行此查询的...在同一网络上，它的速度非常快。