ฉันกำลังปรับปรุงการค้นหาให้ดีที่สุด
สำหรับแบบสอบถามด้านล่าง
SET STATISTICS IO ON;
DECLARE @OrderStartDate DATETIME2 = '27 feb 2016';
DECLARE @OrderEndDate  DATETIME2 = '28 feb 2016';
SELECT  o.strBxOrderNo
        , o.sintOrderStatusID
        , o.sintOrderChannelID
        , o.sintOrderTypeID
        , o.sdtmOrdCreated
        , o.sintMarketID
        , o.strOrderKey
        , o.strOfferCode
        , o.strCurrencyCode
        , o.decBCShipFullPrice
        , o.decBCShipFinal
        , o.decBCShipTax
        , o.decBCTotalAmount
        , o.decWrittenTotalAmount
        , o.decBCWrittenTotalAmount
        , o.decBCShipOfferDisc
        , o.decBCShipOverride
        , o.decTotalAmount
        , o.decShipTax
        , o.decShipFinal
        , o.decShipOverride
        , o.decShipOfferDisc
        , o.decShipFullPrice
        , o.lngAccountParticipantID
        , CONVERT(DATE, o.sdtmOrdCreated, 120) as OrderCreatedDateConverted
FROM    tablebackups.dbo.tblBOrder o
WHERE   o.sdtmOrdCreated >= @OrderStartDate
        AND o.sdtmOrdCreated < @OrderEndDate
        AND EXISTS  (
            SELECT  *
            FROM    tablebackups.dbo.tblBOrderItem oi 
            WHERE   oi.strBxOrderNo = o.strBxOrderNo
            AND     oi.decCatItemPrice > 0
        )
OPTION (RECOMPILE);
ฉันได้สร้างดัชนีตัวกรองต่อไปนี้:
-- table dbo.tblBorderItem
CREATE NONCLUSTERED INDEX IX_tblBOrderItem_decCatItemPrice_INCL 
ON dbo.tblBorderItem 
( 
     strBxOrderNo ASC
    , sintOrderSeqNo ASC
    , decCatItemPrice   
)   
INCLUDE 
(
    blnChargeShipping
    , decBCCatItemPrice
    , decBCCostPrice
    , decBCFinalPrice
    , decBCOfferDiscount
    , decBCOverrideDiscount
    , decBCTaxAmount
    , decCostPrice
    , decFinalPrice
    , decOfferDiscount
    , decOverrideDiscount
    , decTaxAmount
    , decWasPrice
    , dtmOrdItemCreated
    , sintOrderItemStatusId
    , sintOrderItemType
    , sintQuantity
    , strItemNo
)  
WHERE decCatItemPrice > 0 
WITH (DROP_EXISTING = ON, FILLFACTOR = 95);
ดัชนีนี้ไม่ได้ใช้เฉพาะกับแบบสอบถามนี้โดยเฉพาะมีแบบสอบถามอื่น ๆ ที่ใช้ดัชนีเดียวกันนี้ดังนั้นคอลัมน์ INCLUDED
สำหรับการค้นหานี้โดยเฉพาะอย่างยิ่งผมแค่อยากจะตรวจสอบ (มี) หากมีการสั่งซื้อมีรายการใด ๆ decCatItemPrice > 0ที่
SQL Server กำลังทำการสแกนดัชนีตามที่คุณเห็นในภาพด้านล่าง
- สถิติเพิ่งได้รับการอัพเดต
- ตารางรายการมีการทดสอบ 41,208 แถว
โปรดทราบว่าฉันไม่ได้เลือกคอลัมน์ใด ๆ จากตารางรายการ
ตารางรายการนี้มี 164,309,397 รายการสด ฉันต้องการหลีกเลี่ยงการสแกนที่นั่น
คำถาม:
ทำไม SQL Server ไม่ค้นหาดัชนี?
มีปัจจัย / สิ่งอื่น ๆ ที่ฉันควรพิจารณาเพื่อปรับปรุงแบบสอบถามนี้หรือไม่
(4537 row(s) affected) Table 'tblBorder'. Scan count 1, logical reads
116, physical reads 0, read-ahead reads 0, lob logical reads 0, lob
physical reads 0, lob read-ahead reads 0. Table 'tblBorderItem'. Scan
count 1, logical reads 689, physical reads 0, read-ahead reads 0, lob
logical reads 0, lob physical reads 0, lob read-ahead reads 0.
(1 row(s) affected)
นี่คือคำจำกัดความและดัชนีบนตารางtblBorderItem
    IF OBJECT_ID('[dbo].[tblBorderItem]') IS NOT NULL 
    DROP TABLE [dbo].[tblBorderItem] 
    GO
    CREATE TABLE [dbo].[tblBorderItem] ( 
    [strBxOrderNo]                VARCHAR(20)                      NOT NULL,
    [sintOrderSeqNo]              SMALLINT                         NOT NULL,
    [sintOrderItemStatusId]       SMALLINT                         NOT NULL,
    [sintNameStructureID]         SMALLINT                         NOT NULL,
    [strItemNo]                   VARCHAR(20)                      NOT NULL,
    [sintQuantity]                SMALLINT                         NOT NULL,
    [strCurrencyCode]             VARCHAR(3)                       NOT NULL,
    [decCostPrice]                DECIMAL(18,4)                    NOT NULL,
    [decCatItemPrice]             DECIMAL(18,2)                    NOT NULL,
    [decOfferDiscount]            DECIMAL(18,2)                    NOT NULL,
    [decOverrideDiscount]         DECIMAL(18,2)                    NOT NULL,
    [decFinalPrice]               DECIMAL(18,2)                    NOT NULL,
    [decTaxAmount]                DECIMAL(18,2)                    NOT NULL,
    [strBCCurrencyCode]           VARCHAR(3)                       NOT NULL,
    [decBCCostPrice]              DECIMAL(18,4)                    NOT NULL,
    [decBCCatItemPrice]           DECIMAL(18,4)                    NOT NULL,
    [decBCOfferDiscount]          DECIMAL(18,4)                    NOT NULL,
    [decBCOverrideDiscount]       DECIMAL(18,4)                    NOT NULL,
    [decBCFinalPrice]             DECIMAL(18,4)                    NOT NULL,
    [decBCTaxAmount]              DECIMAL(18,4)                    NOT NULL,
    [dtmOrdItemCreated]           DATETIME                         NOT NULL,
    [blnChargeShipping]           BIT                              NOT NULL,
    [lngTimeOfOrderQtyOnHand]     INT                                  NULL,
    [sdtmTimeOfOrderDueDate]      SMALLDATETIME                        NULL,
    [lngProdSetSeqNo]             INT                                  NULL,
    [lngProdRelationId]           INT                                  NULL,
    [lngProdRelationMemberId]     INT                                  NULL,
    [decWasPrice]                 DECIMAL(18,2)                        NULL,
    [sintOrderItemType]           SMALLINT                             NULL,
    [tsRowVersion]                TIMESTAMP                            NULL,
    [sdtmOrderItemStatusUpdated]  SMALLDATETIME                        NULL,
    CONSTRAINT   [PK_tblBOrderItem]  
PRIMARY KEY CLUSTERED    
([strBxOrderNo] asc, [sintOrderSeqNo] asc) 
WITH FILLFACTOR = 100)
    GO
    CREATE NONCLUSTERED INDEX 
    [IX_tblBOrderItem__dtmOrdItemCreated] 
       ON [dbo].[tblBorderItem] ([dtmOrdItemCreated] asc)
       WITH FILLFACTOR = 100
    CREATE NONCLUSTERED INDEX [IX_tblBOrderItem__sintOrderItemStatusId] 
       ON [dbo].[tblBorderItem] ([sintOrderItemStatusId] asc)
       INCLUDE ([sdtmOrderItemStatusUpdated], 
    [sintOrderSeqNo], [strBxOrderNo], [strItemNo])
       WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX [IX_tblBOrderItem__
sintOrderItemStatusId_decFinalPrice_
sdtmOrderItemStatusUpdated_
include_strBxOrderNo] 
   ON [dbo].[tblBorderItem] 
([sintOrderItemStatusId] asc, 
 [decFinalPrice] asc, 
 [sdtmOrderItemStatusUpdated] asc)
   INCLUDE ([strBxOrderNo])
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX [IX_tblBOrderItem__strBxOrderNo] 
   ON [dbo].[tblBorderItem] 
([strBxOrderNo] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX [IX_tblBOrderItem__strItemNo] 
   ON [dbo].[tblBorderItem] ([strItemNo] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrderItem_decCatItemPrice_INCL] 
   ON [dbo].[tblBorderItem] 
([strBxOrderNo] asc, [sintOrderSeqNo] asc, [decCatItemPrice] asc)
   INCLUDE ([blnChargeShipping], 
[decBCCatItemPrice], [decBCCostPrice], [decBCFinalPrice], 
[decBCOfferDiscount], [decBCOverrideDiscount], 
[decBCTaxAmount], [decCostPrice], [decFinalPrice], 
[decOfferDiscount], [decOverrideDiscount], 
[decTaxAmount], [decWasPrice], [dtmOrdItemCreated], 
[sintOrderItemStatusId], [sintOrderItemType], 
[sintQuantity], [strItemNo])
   WHERE ([decCatItemPrice]>(0))
   WITH FILLFACTOR = 95
นี่คือคำจำกัดความและดัชนีบนตารางtblBorder
IF OBJECT_ID('[dbo].[tblBorder]') IS NOT NULL 
DROP TABLE [dbo].[tblBorder] 
GO
CREATE TABLE [dbo].[tblBorder] ( 
[strBxOrderNo]                VARCHAR(20)                      NOT NULL,
[uidOrderUniqueID]            UNIQUEIDENTIFIER                 NOT NULL,
[sintOrderStatusID]           SMALLINT                         NOT NULL,
[sintOrderChannelID]          SMALLINT                         NOT NULL,
[sintOrderTypeID]             SMALLINT                         NOT NULL,
[blnIsBasket]                 BIT                              NOT NULL,
[sdtmOrdCreated]              SMALLDATETIME                    NOT NULL,
[sintMarketID]                SMALLINT                         NOT NULL,
[strOrderKey]                 VARCHAR(20)                      NOT NULL,
[strOfferCode]                VARCHAR(20)                      NOT NULL,
[lngShippedToParticipantID]   INT                              NOT NULL,
[lngOrderedByParticipantID]   INT                              NOT NULL,
[lngShipToAddressID]          INT                              NOT NULL,
[lngAccountAddressID]         INT                              NOT NULL,
[lngAccountParticipantID]     INT                              NOT NULL,
[lngOrderedByAddressID]       INT                              NOT NULL,
[lngOrderTakenBy]             INT                              NOT NULL,
[strCurrencyCode]             VARCHAR(3)                       NOT NULL,
[decShipFullPrice]            DECIMAL(18,2)                    NOT NULL,
[decShipOfferDisc]            DECIMAL(18,2)                    NOT NULL,
[decShipOverride]             DECIMAL(18,2)                    NOT NULL,
[decShipFinal]                DECIMAL(18,2)                    NOT NULL,
[decShipTax]                  DECIMAL(18,2)                    NOT NULL,
[strBCCurrencyCode]           VARCHAR(3)                       NOT NULL,
[decBCShipFullPrice]          DECIMAL(18,4)                    NOT NULL,
[decBCShipOfferDisc]          DECIMAL(18,4)                    NOT NULL,
[decBCShipOverride]           DECIMAL(18,4)                    NOT NULL,
[decBCShipFinal]              DECIMAL(18,4)                    NOT NULL,
[decBCShipTax]                DECIMAL(18,4)                    NOT NULL,
[decTotalAmount]              DECIMAL(18,2)                    NOT NULL,
[decBCTotalAmount]            DECIMAL(18,4)                    NOT NULL,
[decWrittenTotalAmount]       DECIMAL(18,2)                        NULL,
[decBCWrittenTotalAmount]     DECIMAL(18,4)                        NULL,
[blnProRataShipping]          BIT                              NOT NULL,
[blnChargeWithFirstShipment]  BIT                              NOT NULL,
[sintShippingServiceLevelID]  SMALLINT                         NOT NULL,
[sintShippingMethodID]        SMALLINT                         NOT NULL,
[sdtmDoNotShipUntil]          SMALLDATETIME                        NULL,
[blnHoldUntilComplete]        BIT                              NOT NULL,
[tsRowVersion]                TIMESTAMP                            NULL,
CONSTRAINT   [PK_tblBOrder]  
PRIMARY KEY CLUSTERED    
([strBxOrderNo] asc) WITH FILLFACTOR = 100)
GO
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngAccountAddressID] 
   ON [dbo].[tblBorder] 
   ([lngAccountAddressID] asc, [sintOrderStatusID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngAccountParticipantID] 
   ON [dbo].[tblBorder] 
   ([lngAccountParticipantID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngOrderedByAddressID] 
   ON [dbo].[tblBorder] 
   ([lngOrderedByAddressID] asc, [sintOrderStatusID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngOrderedByParticipantID] 
   ON [dbo].[tblBorder] ([lngOrderedByParticipantID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngShippedToParticipantID] 
   ON [dbo].[tblBorder] 
   ([lngShippedToParticipantID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__lngShipToAddressID] 
   ON [dbo].[tblBorder] 
   ([lngShipToAddressID] asc, [sintOrderStatusID] asc)
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder__sdtmOrdCreated_sintMarketID__include_strBxOrderNo] 
   ON [dbo].[tblBorder] 
   ([sdtmOrdCreated] asc, [sintMarketID] asc)
   INCLUDE ([strBxOrderNo])
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX 
[IX_tblBOrder_sdtmOrdCreated_INCL] 
   ON [dbo].[tblBorder] 
   ([sdtmOrdCreated] asc)
   INCLUDE ([decBCShipFinal], [decBCShipFullPrice], 
            [decBCShipOfferDisc], [decBCShipOverride], 
            [decBCShipTax], [decBCTotalAmount], [decBCWrittenTotalAmount], 
            [decShipFinal], [decShipFullPrice], [decShipOfferDisc], 
            [decShipOverride], [decShipTax], [decTotalAmount], 
            [decWrittenTotalAmount], [lngAccountParticipantID], 
            [lngOrderedByParticipantID], [sintMarketID], 
            [sintOrderChannelID], [sintOrderStatusID], 
            [sintOrderTypeID], [strBxOrderNo], [strCurrencyCode], 
            [strOfferCode], [strOrderKey])
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED 
INDEX [IX_tblBOrder_sintMarketID_sdtmOrdCreated] 
   ON [dbo].[tblBorder] 
   ([sintMarketID] asc, [sdtmOrdCreated] asc)
   INCLUDE ([sintOrderChannelID], [strBxOrderNo])
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED 
INDEX [IX_tblBOrder__sintOrderChannelID_sdtmOrdCreated_INCL] 
   ON [dbo].[tblBorder] 
   ([sintOrderChannelID] asc, [sdtmOrdCreated] asc)
   INCLUDE ([decBCShipFinal], [decBCShipFullPrice], 
   [decBCShipTax], [decShipFinal], [decShipFullPrice], 
   [decShipTax], [lngAccountParticipantID], [sintMarketID], 
   [sintOrderTypeID], [strBxOrderNo], 
   [strCurrencyCode], [strOrderKey])
   WITH FILLFACTOR = 100
CREATE NONCLUSTERED INDEX [IX_tblBOrder_strBxOrderNo_sdtmOrdCreated_incl] 
   ON [dbo].[tblBorder] ([strBxOrderNo] asc, 
   [sdtmOrdCreated] asc)
   INCLUDE ([sintOrderChannelID], [sintOrderTypeID], [sintMarketID], 
   [strOrderKey], [lngAccountParticipantID], [strCurrencyCode], 
   [decShipFullPrice], [decShipFinal], [decShipTax], 
   [decBCShipFullPrice], [decBCShipFinal], 
   [decBCShipTax])ข้อสรุป
ฉันใช้ดัชนีของฉันในระบบสดและอัปเดตกระบวนงานที่เก็บไว้ของฉันเพื่อใช้ SMALLDATETIME เพื่อให้ตรงกับประเภทข้อมูลในฐานข้อมูลสำหรับคอลัมน์ที่เกี่ยวข้อง
หลังจากนั้นเมื่อดูแผนแบบสอบถามฉันเห็นภาพด้านล่าง:
มันเป็นสิ่งที่ฉันต้องการอย่างแท้จริง
ฉันคิดว่าเครื่องมือเพิ่มประสิทธิภาพข้อความค้นหาในกรณีนี้ทำงานได้ดีเพื่อให้ได้แผนการสืบค้นที่ดีที่สุดในทั้งสองสภาพแวดล้อมและฉันดีใจที่ฉันไม่ได้เพิ่มคำแนะนำการสืบค้นใด ๆ
ฉันเรียนรู้ด้วย 3 คำตอบที่โพสต์ ขอบคุณMax Vernon , Paul WhiteและDaniel Hutmacherสำหรับคำตอบของพวกเขา





