我已经有这个问题了几个星期了.问题是查询需要4-5分钟才能在网站上运行,最多需要2或3秒才能在ssms中运行.此外,我发现在对此查询进行更改后,例如添加customerId变量,它将在网页上快速开始运行,但到第二天它再次变慢.有问题的查询是这样的:
DECLARE @customerID INT
SET @customerID = @CustID
DECLARE @MyTable table(
Iden int NOT NULL IDENTITY(1,1),
ProductID int)
INSERT INTO @MyTable(ProductID)
SELECT P.ProductID FROM Product P WITH (NOLOCK)
left join Compunix_ProductMMY cpmmy with (nolock) on p.ProductID = cpmmy.ProductID
left join Compunix_CustomerMMY ccmmy with (nolock) on ccmmy.mmyid = cpmmy.mmyid
WHERE P.Deleted=0 AND P.Published=1 and (ccmmy.customerid = @customerID OR cpmmy.productid IS NULL)
SELECT c.Name, c.SeName, c.CategoryID
FROM Category c WITH (NOLOCK)
JOIN ProductCategory PC With (NOLOCK) ON C.CategoryID = PC.CategoryID
JOIN @MyTable …