緩慢的MySQL查詢「複製到tmp表」，幫助重寫它

這個mysql查詢是非常緩慢的，當我看着它是「複製到tmp表」查詢。這些表是非常大特別是search_attribute（79萬行）和search_attribute_values（350,000行）緩慢的MySQL查詢「複製到tmp表」，幫助重寫它

SELECT attributenames.name, search_attribute_values.value 
FROM attributenames, categorysearchattributes, search_attribute, search_attribute_values 
WHERE 
categorysearchattributes.attributeid = attributenames.attributeid AND categorysearchattributes.categoryid = 4800 AND 
categorysearchattributes.attributeid = search_attribute.attributeid AND 
search_attribute.valueid = search_attribute_values.valueid AND 
attributenames.localeid = 1 
GROUP BY search_attribute.valueid

Here is a picture of the EXPLAIN of the query

這裏是我的數據庫架構

-- MySQL dump 10.13 Distrib 5.5.46, for debian-linux-gnu (x86_64) 
-- 
-- Host: localhost Database: 
-- ------------------------------------------------------ 
-- Server version 5.5.46-0ubuntu0.14.04.2 

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-- 
-- Table structure for table `attributenames` 
-- 

DROP TABLE IF EXISTS `attributenames`; 
/*!40101 SET @saved_cs_client  = @@character_set_client */; 
/*!40101 SET character_set_client = utf8 */; 
CREATE TABLE `attributenames` (
    `attributeid` bigint(20) NOT NULL DEFAULT '0', 
    `name` varchar(110) NOT NULL DEFAULT '', 
    `localeid` int(11) NOT NULL DEFAULT '0', 
    KEY `attributenames_attributeID` (`attributeid`), 
    KEY `attributenames_localeID` (`localeid`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1; 
/*!40101 SET character_set_client = @saved_cs_client */; 


-- 
-- Table structure for table `categorysearchattributes` 
-- 

DROP TABLE IF EXISTS `categorysearchattributes`; 
/*!40101 SET @saved_cs_client  = @@character_set_client */; 
/*!40101 SET character_set_client = utf8 */; 
CREATE TABLE `categorysearchattributes` (
    `categoryid` int(11) NOT NULL DEFAULT '0', 
    `attributeid` bigint(20) NOT NULL DEFAULT '0', 
    `isactive` tinyint(1) NOT NULL DEFAULT '1', 
    KEY `caterysearchattributes_aID` (`attributeid`), 
    KEY `caterysearchattributes_cID` (`categoryid`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1; 
/*!40101 SET character_set_client = @saved_cs_client */; 

-- 
-- Table structure for table `product` 
-- 

DROP TABLE IF EXISTS `product`; 
/*!40101 SET @saved_cs_client  = @@character_set_client */; 
/*!40101 SET character_set_client = utf8 */; 
CREATE TABLE `product` (
    `productid` int(11) NOT NULL DEFAULT '0', 
    `manufacturerid` int(11) NOT NULL DEFAULT '0', 
    `isactive` tinyint(1) NOT NULL DEFAULT '1', 
    `mfgpartno` varchar(70) NOT NULL DEFAULT '', 
    `categoryid` int(11) NOT NULL DEFAULT '0', 
    `isaccessory` tinyint(1) NOT NULL DEFAULT '0', 
    `equivalency` double NOT NULL DEFAULT '0', 
    `creationdate` datetime NOT NULL DEFAULT '0000-00-00 00:00:00', 
    `modifieddate` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, 
    `lastupdated` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    PRIMARY KEY (`productid`), 
    KEY `product_manufacturerID` (`manufacturerid`), 
    KEY `product_categoryID` (`categoryid`), 
    KEY `product_mfgPartNo` (`mfgpartno`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1; 
/*!40101 SET character_set_client = @saved_cs_client */; 

-- 
-- Table structure for table `search_attribute` 
-- 

DROP TABLE IF EXISTS `search_attribute`; 
/*!40101 SET @saved_cs_client  = @@character_set_client */; 
/*!40101 SET character_set_client = utf8 */; 
CREATE TABLE `search_attribute` (
    `productid` int(11) NOT NULL DEFAULT '0', 
    `attributeid` bigint(20) NOT NULL DEFAULT '0', 
    `valueid` int(11) NOT NULL DEFAULT '0', 
    `localeid` int(11) NOT NULL DEFAULT '0', 
    `setnumber` tinyint(2) NOT NULL DEFAULT '0', 
    `isactive` tinyint(1) NOT NULL DEFAULT '1', 
    PRIMARY KEY (`productid`,`localeid`,`attributeid`,`setnumber`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1; 
/*!40101 SET character_set_client = @saved_cs_client */; 

-- 
-- Table structure for table `search_attribute_values` 
-- 

DROP TABLE IF EXISTS `search_attribute_values`; 
/*!40101 SET @saved_cs_client  = @@character_set_client */; 
/*!40101 SET character_set_client = utf8 */; 
CREATE TABLE `search_attribute_values` (
    `valueid` int(11) NOT NULL DEFAULT '0', 
    `value` varchar(255) NOT NULL DEFAULT '', 
    `absolutevalue` double NOT NULL DEFAULT '0', 
    `unitid` int(11) NOT NULL DEFAULT '0', 
    `isabsolute` tinyint(1) NOT NULL DEFAULT '0', 
    PRIMARY KEY (`valueid`), 
    KEY `search_attrval_value` (`value`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1; 
/*!40101 SET character_set_client = @saved_cs_client */;

Added attributeid_valueid index

來源

2015-12-04 Aaron

通過查看圖片中的EXPLAIN查詢，表search_attribute正在進行全表掃描，即不使用索引。

將索引添加到valueid列的search_attribute表應該使其更快。嘗試一下並在添加索引後分享您的結果。

ALTER TABLE `search_attribute` ADD KEY `idx_valueid` (`valueid`);

請嘗試以下建議的組合。

來源

2015-12-04 06:48:11 Samir

編輯我原來的帖子，包括模式 – Aaron

您可以嘗試添加索引按照我的文章。 – Samir

我加了那個索引，它的速度還是很慢的 – Aaron

緩慢的MySQL查詢「複製到tmp表」，幫助重寫它

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