Saya sedang berupaya mengoptimalkan beberapa pertanyaan.
Untuk kueri di bawah ini,
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);
Saya telah membuat indeks FILTERED berikut:
-- 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);
Indeks ini tidak hanya digunakan untuk kueri ini khususnya, ada permintaan lain yang menggunakan indeks yang sama ini, oleh karena itu kolom TERMASUK.
Khusus untuk kueri ini, saya hanya ingin memeriksa (ADA) jika ada pesanan di mana saja decCatItemPrice > 0
.
SQL Server sedang melakukan pemindaian indeks seperti yang Anda lihat pada gambar di bawah ini.
- Statistik baru saja diperbarui.
- Tabel item memiliki 41.208 baris dalam pengujian.
Harap dicatat, saya tidak memilih kolom apa pun dari tabel item.
Tabel item ini memiliki 164.309.397 siaran langsung. Saya ingin menghindari pemindaian di sana.
pertanyaan:
Mengapa SQL Server tidak melakukan pencarian indeks?
Apakah ada faktor / hal lain yang harus saya pertimbangkan untuk meningkatkan kueri ini?
(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)
ini adalah definisi dan indeks pada tabel tblBorderItem
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
ini adalah definisi dan indeks pada tblBorder tabel
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])
Kesimpulan
Saya menerapkan indeks saya pada sistem LIVE, dan memperbarui prosedur tersimpan saya untuk menggunakan SMALLDATETIME, agar sesuai dengan tipe data dalam database untuk kolom yang terlibat.
Setelah itu, ketika melihat paket permintaan saya melihat gambar di bawah ini:
persis seperti yang saya inginkan.
Saya pikir optimizer permintaan dalam hal ini melakukan pekerjaan yang baik untuk mendapatkan rencana permintaan terbaik di kedua lingkungan, dan saya senang saya tidak menambahkan petunjuk kueri.
Saya belajar dengan 3 jawaban yang diposting. terima kasih kepada Max Vernon , Paul White dan Daniel Hutmacher atas jawaban mereka.
sumber