Ich arbeite an der Optimierung einiger Abfragen.
Für die Abfrage unten,
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);
Ich habe den folgenden GEFILTERTEN Index erstellt:
-- 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);
Dieser Index wird nicht nur für diese Abfrage verwendet, sondern es gibt auch andere Abfragen, die denselben Index verwenden, daher die INCLUDED-Spalten.
Insbesondere für diese Abfrage möchte ich nur prüfen (EXISTS), ob eine Bestellung einen Artikel enthält, bei dem decCatItemPrice > 0
.
SQL Server führt einen Index-Scan durch, wie Sie in den folgenden Abbildungen sehen können.
- Statistiken wurden gerade aktualisiert.
- Die Artikeltabelle enthält im Test 41.208 Zeilen.
Bitte beachten Sie, dass ich keine Spalten aus der Artikeltabelle auswähle.
Diese Artikeltabelle hat 164.309.397 im Leben. Ich möchte dort einen Scan vermeiden.
Fragen:
Warum führt SQL Server keine Indexsuche durch?
Gibt es andere Faktoren / Dinge, die ich berücksichtigen sollte, um diese Abfrage zu verbessern?
(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)
Dies ist die Definition und die Indizes für die Tabelle 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
Dies ist die Definition und die Indizes für die Tabelle tblBorder
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])
Fazit
Ich habe meinen Index auf das LIVE-System angewendet und meine gespeicherte Prozedur für die Verwendung von SMALLDATETIME aktualisiert, um die Datentypen in der Datenbank für die betroffenen Spalten abzugleichen.
Danach sehe ich beim Betrachten des Abfrageplans das folgende Bild:
es war genau so, wie ich es wollte.
Ich denke, dass das Abfrageoptimierungsprogramm in diesem Fall gute Arbeit geleistet hat, um den besten Abfrageplan für beide Umgebungen zu erhalten, und ich bin froh, dass ich keine Abfragehinweise hinzugefügt habe.
Ich habe gelernt, mit den 3 Antworten gepostet. Vielen Dank an Max Vernon , Paul White und Daniel Hutmacher für die Antworten.
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