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我的一個查詢（它用於創建報告，所以它只包含：where，join和group by）在~20分鐘後返回超時。估計的執行計劃給我看：查詢優化 - 增加估計的數據大小
這個哈希匹配可能是我的查詢的WHERE子句指組。但是對我來說有趣的是預計數據大小〜3TB，比我的數據庫大10倍。調查後，我認識到查詢執行的一部分higly增加此數據傳輸：
但這種嵌套循環在查詢成本由於預計的執行計劃產生任何影響。
此查詢Reporting Services所生成和逮住（我刪除一些未使用部分）：
SET DATEFIRST 7
SELECT
SUM([f_orders].[LORDEREDQTY_PU]) [QtyPU],
SUM((((((((([f_orders].[DTRANSFERPRICE] + [f_orders].[DICSBASICORDERFEE]) + [f_orders].[DICSFREIGHTCHARGE]) + [f_orders].[DICSINSURANCEFEE]) + [f_orders].[DICSPACKINGFEE]) + [f_orders].[DICSFREETXTFEE]) + [f_orders].[DICSLOGISTICSFEE]) + [f_orders].[DICSPACKAGEPACKINGFEE]) * [A_ExchangeRates].[USDRate])) [TPinclChargesinUSDBudgetexchangerate],
[f_orders].[LORDEREDQTY] [TotalQty],
[dbo_D_ORDERADDRESS].[Countrycode] [Countrycode],
[D_PRODUCT_NEW].[Framesize] [Framesize],
[f_orders].[SZCUSSHORTNAME] [Customershortname],
[f_orders].[SZCUSNO] [Customerno],
[D_PRODUCT_NEW].[Generationcode] [Generationcode],
[D_PU].[PU] [PU],
[D_BALIDINFO].[SRU] [SRU],
[D_WAREHOUSE].[Warehouse] [Warehouse],
[f_orders].[DATE_OrderBookedatSU] [OrderbookedatSU],
[f_orders].[DTCONFIRMEDDEL] [Confirmeddeliverydate],
[D_PRODUCT_NEW].[MotorsProductType] [MotorsProductType],
[f_orders].[SZORDERNO] [Orderno],
[f_orders].[IORDERLINENO] [Orderlineno],
[D_FRAMESIZE].[Framesize1] [Framesize1],
[D_PRODGROUP].[Productgroup] [Productgroup],
[D_PRODTYPE].[Producttype] [Producttype],
[f_orders].[SZPRODNO] [Productno],
[D_TYPEOFORDHAND].[Typeoforderhandling] [Typeoforderhandling],
CASE WHEN COALESCE(LEN([f_orders].[SZVARIANTCODE]), 0) = 0 THEN CAST([f_orders].[IVARIANTCODENO] AS VARCHAR(255)) ELSE [f_orders].[SZVARIANTCODE] END [Variantcodeno],
[f_orders].[IVARIANTIDX] [Variantindex],
[f_orders].[DATE_OrderBookedatSU] [OrderbookedatSU1],
[f_orders].[DATE_OrderBookedatSU] [OrderbookedatSU2]
FROM
[dbo].[f_orders] [f_orders]
LEFT OUTER JOIN (
SELECT
[dbo_D_ORDERADDRESS].[SZCOUNTRYCODE] [Countrycode],
[dbo_D_ORDERADDRESS].[ADDRESS_ORGID] [ADDRESS_ORGID]
FROM
(
SELECT CAST(1 AS numeric(38)) AS ID, CAST(CVCOUNTRY AS int) AS cvcountry, ADDRESS_ORGID, ORDERLINE_ORGID, ORDER_ORGID, CVADDRESSTYPE, IDWSOURCEID,
LORDERID, IORDERLINENO, SZNAME1, SZNAME2, SZNAME3, SZROAD1, SZROAD2, SZROAD3, SZPOSTCODE, SZTOWN, SZPHONE, SZFAX, SZCONTACTPERSON,
SZEMAIL, SZVATID, SZINVCUSNO, SZCOUNTRYCODE
FROM D_ORDERADDRESS_NEW
) [dbo_D_ORDERADDRESS]
) [dbo_D_ORDERADDRESS] ON ([f_orders].[DELADDRESS_ORGID] = [dbo_D_ORDERADDRESS].[ADDRESS_ORGID] OR [f_orders].[DELADDRESS_ORGID] IS NULL AND [dbo_D_ORDERADDRESS].[ADDRESS_ORGID] IS NULL)
LEFT OUTER JOIN (
SELECT
[D_FRAMESIZE].[Framesize] [Framesize],
[D_PRODUCT_NEW].[SZGENCODE] [Generationcode],
[D_PRODTYPE].[MotorsProductType] [MotorsProductType],
[D_PRODTYPE].[MotorsProdType] [MotorsProdType],
[D_PRODUCT_NEW].[DWBOBJECTOID] [DWBOBJECTOID]
FROM
[dbo].[D_PRODUCT_NEW] [D_PRODUCT_NEW]
LEFT OUTER JOIN (
SELECT
[D_FRAMESIZE].[DESCRIPTIONEN] [Framesize],
[D_FRAMESIZE].[VALUE] [VALUE]
FROM
[dbo].[D_FRAMESIZE] [D_FRAMESIZE]
) [D_FRAMESIZE] ON [D_PRODUCT_NEW].[CVFRAMESIZE] = [D_FRAMESIZE].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_PRODTYPE].[SZMDPRODTYPE] [MotorsProductType],
[D_PRODTYPE].[SZMDPRODTYPE] [MotorsProdType],
[D_PRODTYPE].[VALUE] [VALUE]
FROM
[dbo].[D_PRODTYPE] [D_PRODTYPE]
) [D_PRODTYPE] ON [D_PRODUCT_NEW].[CVPRODTYPE] = [D_PRODTYPE].[VALUE]
) [D_PRODUCT_NEW] ON ([f_orders].[DWPRDOID] = [D_PRODUCT_NEW].[DWBOBJECTOID] OR [f_orders].[DWPRDOID] IS NULL AND [D_PRODUCT_NEW].[DWBOBJECTOID] IS NULL)
LEFT OUTER JOIN (
SELECT
[D_BALIDINFO].[SZSOPREGION] [SRUSOPRegion],
[D_BALIDINFO].[SZCOUNTRY] [SRUCountry],
[D_BALIDINFO].[SZALTERNATEID] [SRU],
[D_BALIDINFO].[SZALTERNATEID] [SZALTERNATEID],
[D_BALIDINFO].[SZSOPREGION] [SOPRegion],
[D_BALIDINFO].[DWBOBJECTOID] [DWBOBJECTOID]
FROM
[dbo].[D_BALIDINFO] [D_BALIDINFO]
) [D_BALIDINFO] ON [f_orders].[DWSALESRESPONSIBLEUNITOID] = [D_BALIDINFO].[DWBOBJECTOID]
LEFT OUTER JOIN (
SELECT
[D_PU].[DESCRIPTIONEN] [PU],
[D_PU].[DESCRIPTIONEN] [PU2],
[D_PU].[VALUE] [VALUE]
FROM
[dbo].[D_PU] [D_PU]
) [D_PU] ON [f_orders].[CVPU] = [D_PU].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_WAREHOUSE].[DESCRIPTIONEN] [Warehouse],
[D_WAREHOUSE].[DESCRIPTIONEN] [Warehouse2],
[D_WAREHOUSE].[VALUE] [VALUE]
FROM
[dbo].[D_WAREHOUSE] [D_WAREHOUSE]
) [D_WAREHOUSE] ON [f_orders].[CVWAREHOUSEID] = [D_WAREHOUSE].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_FRAMESIZE].[DESCRIPTIONEN] [Framesize1],
[D_FRAMESIZE].[DESCRIPTIONEN] [FrameSize],
[D_FRAMESIZE].[VALUE] [VALUE]
FROM
[dbo].[D_FRAMESIZE] [D_FRAMESIZE]
) [D_FRAMESIZE] ON [f_orders].[CVFRAMESIZE] = [D_FRAMESIZE].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_PRODGROUP].[DESCRIPTIONEN] [Productgroup],
[D_PRODGROUP].[DESCRIPTIONEN] [ProductGroup2],
[D_PRODGROUP].[VALUE] [VALUE]
FROM
[dbo].[D_PRODGROUP] [D_PRODGROUP]
) [D_PRODGROUP] ON [f_orders].[CVPRODGROUP] = [D_PRODGROUP].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_PRODTYPE].[DESCRIPTIONEN] [Producttype],
[D_PRODTYPE].[DESCRIPTIONEN] [ProductType2],
[D_PRODTYPE].[VALUE] [VALUE]
FROM
[dbo].[D_PRODTYPE] [D_PRODTYPE]
) [D_PRODTYPE] ON [f_orders].[CVPRODTYPE] = [D_PRODTYPE].[VALUE]
INNER JOIN (
SELECT
[S_SECURITY].[Login_Name] [LoginName],
[S_SECURITY].[Security_ID] [Security_ID]
FROM
[dbo].[S_SECURITY] [S_SECURITY]
) [S_SECURITY] ON [f_orders].[SECURITY_ID2] = [S_SECURITY].[Security_ID]
LEFT OUTER JOIN (
SELECT
[D_ORDERTYPE].[DESCRIPTIONEN] [OrderType],
[D_ORDERTYPE].[VALUE] [VALUE]
FROM
[dbo].[D_ORDERTYPE] [D_ORDERTYPE]
) [D_ORDERTYPE] ON [f_orders].[CVORDERTYPE] = [D_ORDERTYPE].[VALUE]
LEFT OUTER JOIN (
SELECT
[D_LINEORDERTYPE].[DESCRIPTIONEN] [LineOrderType],
[D_LINEORDERTYPE].[VALUE] [VALUE]
FROM
[dbo].[D_LINEORDERTYPE] [D_LINEORDERTYPE]
) [D_LINEORDERTYPE] ON [f_orders].[CVLINEORDERTYPE] = [D_LINEORDERTYPE].[VALUE]
LEFT OUTER JOIN (
SELECT
[A_ExchangeRates].[USDRate] [USDRate],
[A_ExchangeRates].[CVCurrency] [CVCurrency],
[A_ExchangeRates].[RateDate] [RateDate]
FROM
[dbo].[A_ExchangeRates] [A_ExchangeRates]
) [A_ExchangeRates] ON [f_orders].[CVCURRENCY] = [A_ExchangeRates].[CVCurrency] AND [f_orders].[DATE_OrderBookedatSU] = [A_ExchangeRates].[RateDate]
LEFT OUTER JOIN (
SELECT
[D_TYPEOFORDHAND].[DESCRIPTIONEN] [Typeoforderhandling],
[D_TYPEOFORDHAND].[VALUE] [VALUE]
FROM
[dbo].[D_TYPEOFORDHAND] [D_TYPEOFORDHAND]
) [D_TYPEOFORDHAND] ON [f_orders].[CVTYPEOFORDHAND] = [D_TYPEOFORDHAND].[VALUE]
GROUP BY
[f_orders].[LORDEREDQTY], [dbo_D_ORDERADDRESS].[Countrycode], [D_PRODUCT_NEW].[Framesize],
[f_orders].[SZCUSSHORTNAME], [f_orders].[SZCUSNO], [D_PRODUCT_NEW].[Generationcode],
[D_BALIDINFO].[SRUSOPRegion], [D_BALIDINFO].[SRUCountry], [D_PU].[PU], [D_BALIDINFO].[SRU], [D_WAREHOUSE].[Warehouse], [f_orders].[DATE_OrderBookedatSU], [f_orders].[DTCONFIRMEDDEL],
[D_PRODUCT_NEW].[MotorsProductType], [f_orders].[SZORDERNO], [f_orders].[IORDERLINENO], [D_FRAMESIZE].[Framesize1],
[D_PRODGROUP].[Productgroup], [D_PRODTYPE].[Producttype], [f_orders].[SZPRODNO],
CASE WHEN COALESCE(LEN([f_orders].[SZVARIANTCODE]), 0) = 0 THEN CAST([f_orders].[IVARIANTCODENO] AS VARCHAR(255)) ELSE [f_orders].[SZVARIANTCODE] END,
[f_orders].[IVARIANTIDX], [f_orders].[DATE_OrderBookedatSU], [f_orders].[DATE_OrderBookedatSU], D_TYPEOFORDHAND.Typeoforderhandling
1.Increasing通過嵌套循環估計的數據大小是正常的，沒有任何性能影響？
2.我使用了大約20個分組列，它似乎對查詢成本有最大的影響。有可能取代這個哈希匹配？
發佈您的查詢 –
在「查詢」中選擇「包括實際執行計劃」。總體而言，這比「顯示估計執行計劃」更好。此外，這是一個複雜的查詢，如果沒有大量數據進行酸性測試，很難確定任何問題。我可以推薦的是：1）檢查索引，2）檢查參數嗅探，3）檢查部分查詢以查找瓶頸 – jean
Btw處理流程中數據量的增加是由於某些聯接造成的。當您連接兩個具有3行和7行的表格並將TRUE作爲連接條件時，您有21行（兩倍以上的表格中有兩倍）的示例 – jean