更新存储过程中的查询需要花费大量时间

Question

这适用于SQL Server 2012。我被要求优化用于计算各种发票的账单金额的存储过程。这是一个巨大的存储过程，包含大量的插入、更新和删除查询，并在多个表上进行联接。存储过程在这个特定的更新查询上停留了8-9个小时。该查询正在更新约40万条记录。

在执行存储过程时，除了运行存储过程的数据库之外，没有其他与数据库的连接。

The query is

UPDATE D
SET Amount=CASE WHEN D.Container='PCS' AND DP.AmountPerStop =0 THEN DP1.Amount*ISNULL(ISNULL(M2.MPDFactor, M.MPDFactor), 1) ELSE DP1.Amount+DP.Amount*(DeliveryQty-1) END,
InvoiceID=I.InvoiceID,
MPDFactor=CASE WHEN D.Container='PCS' AND DP.AmountPerStop =0 THEN ISNULL(M2.MPDFactor, M.MPDFactor) ELSE NULL END,
PickupAmountCap = DP.PickupAmountCap
FROM dbo.tDeliveries D
JOIN tDeliveryPrices DP ON DP.ProductGroupCode=D.ProductGroupCode AND DP.Container=D.Container AND DP.Zone=D.Zone
JOIN tVendorAgreements A ON A.DIP=D.DIP AND DP.VendorAgreementID=A.VendorAgreementID
JOIN tDeliveryPrices DP1 ON DP1.ProductGroupCode=D.ProductGroupCode AND DP1.Container=D.Container AND DP1.Zone=D.Zone AND DP1.VendorAgreementID=A.VendorAgreementID
JOIN tDIP DIP ON D.Dip=DIP.Dip
JOIN tInvoices I ON A.VendorAgreementID=I.VendorAgreementID
JOIN @tDailyInvoicePeriodForDIP IP ON IP.DIP = DIP.DIP
LEFT JOIN tMPDFactors M ON M.DIPArea=DIP.DipArea AND M.ProductGroupCode=D.ProductGroupCode AND D.DeliveryQty BETWEEN M.StartQty AND M.EndQty        
LEFT JOIN tMPDFactors M2 ON M2.DIP=DIP.Dip AND M2.ProductGroupCode=D.ProductGroupCode AND D.DeliveryQty BETWEEN M2.StartQty AND M2.EndQty           
WHERE D.InvoiceID IS NULL AND
I.InvoicePeriod= @Period AND
I.InvoiceLockedDate IS NULL AND
DP1.StartQty=1 AND
(DeliveryQty BETWEEN DP.StartQty AND DP.EndQty OR D.Container='PCS') AND 
D.Event_Type = 'I' AND
@Period BETWEEN A.ValidFromDate AND A.ValidUntilDate

就最终结果而言，查询运行良好。只是花了这么多时间。任何帮助都将不胜感激。

Answer 1

您是否尝试过对存储过程使用重新编译选项？如果存储过程使用非常小的数据集生成了查询计划，则该计划可能会强制该过程遍历非常大的表，因为原始查询计划确定遍历表是收集或更新数据的最有效方法。这可能无法完全解决您的问题，但这是另一种选择。此外，该建议是开始确定低效步骤的好地方。