Aşağıdaki gibi tanımlanmış bir SQL Server tablo var
CREATE TABLE [dbo].[Production_Detail]
(
[Id] [bigint] NOT NULL DEFAULT (NEXT VALUE FOR [dbo].[Production_Detail_Seq]),
[Meta_Data_ID] INT NOT NULL ,
[Production_Detail_Time] DATETIME NOT NULL,
[Production_Detail_Time_Local] DATETIME NOT NULL,
[Production_Detail_Value] FLOAT NULL,
[IntegratedDM] BIT NOT NULL DEFAULT 0,
[DailyIntegratedDM] BIT NOT NULL DEFAULT 0,
[InsertedDate] DateTime NOT NULL,
[ModifiedDate] DateTime NOT NULL,
CONSTRAINT [PK_Production_Detail] PRIMARY KEY ([Id]),
CONSTRAINT [UK_Production_Detail] UNIQUE ([Meta_Data_Id], [Production_Detail_Time]),
CONSTRAINT [FK_Production_Detail_To_Meta_Data] FOREIGN KEY ([Meta_Data_ID]) REFERENCES [Meta_Data]([Meta_Data_ID])
)
GO
CREATE NONCLUSTERED INDEX [IX_Production_Detail_Production_Detail_Time_Local]
ON [dbo].[Production_Detail] ([Production_Detail_Time_Local])
INCLUDE ([Meta_Data_ID], [Production_Detail_Time], [Production_Detail_Value])
GO
CREATE UNIQUE NONCLUSTERED INDEX [IX_Production_Detail_Meta_Data_ID_Production_Detail_Time]
ON [dbo].[Production_Detail] ([Meta_Data_ID] ASC, [Production_Detail_Time] ASC)
GO
CREATE NONCLUSTERED INDEX [IX_Production_Detail_IntegratedDM_MetaDataId]
ON [dbo].[Production_Detail] ([IntegratedDM], [Meta_Data_ID])
INCLUDE ([Production_Detail_Time])
GO
Bu tablo gerçek zamanlı veriler içerir, bu nedenle kayıtlar sürekli olarak eklenir. 5 günden daha eski verileri silmeye çalışıyorum. Ancak silme çalışırken, kilitlenme atar birkaç ekleme deyimi var.
İşte silme sorgusu. #ToPurge
Masa ihtiyaçları Silinecek bu kimliği içerir. #ToPurge
Tablo, herhangi bir dizin yok. Satır sayısı değişebilir, ancak test durumum için 3 milyondan fazla vardı:
Declare @RowCount int;
set @RowCount = @@ROWCOUNT;
while @RowCount > 0
begin
delete top(20000) pd
from #ToPurge tp
inner join [DataWarehouse].[dbo].[Production_Detail] pd on (tp.ID = pd.ID)
set @RowCount = @@ROWCOUNT;
end
İşte silme sorgusundan yürütme planı
<?xml version="1.0" encoding="utf-16"?>
<ShowPlanXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.2" Build="11.0.3128.0" xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan">
<BatchSequence>
<Batch>
<Statements>
<StmtSimple StatementCompId="1" StatementEstRows="20000" StatementId="1" StatementOptmLevel="FULL" StatementSubTreeCost="34.7996" StatementText=" delete top(20000) pd
 from #ToPurge tp
 inner join [DataWarehouse].[dbo].[Production_Detail] pd on (tp.ID = pd.ID)" StatementType="DELETE" QueryHash="0xF7A9CF8E140CDB4E" QueryPlanHash="0x2CC61A780737A398" RetrievedFromCache="false">
<StatementSetOptions ANSI_NULLS="true" ANSI_PADDING="true" ANSI_WARNINGS="true" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="true" NUMERIC_ROUNDABORT="false" QUOTED_IDENTIFIER="true" />
<QueryPlan CachedPlanSize="88" CompileTime="65" CompileCPU="65" CompileMemory="592">
<ThreadStat Branches="2" />
<MemoryGrantInfo SerialRequiredMemory="1024" SerialDesiredMemory="477448" />
<OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="209715" EstimatedPagesCached="419430" EstimatedAvailableDegreeOfParallelism="4" />
<RelOp AvgRowSize="9" EstimateCPU="0.08" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Sequence" NodeId="0" Parallel="false" PhysicalOp="Sequence" EstimatedTotalSubtreeCost="34.7996">
<OutputList />
<Sequence>
<RelOp AvgRowSize="9" EstimateCPU="0.02" EstimateIO="0.458155" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Delete" NodeId="1" Parallel="false" PhysicalOp="Index Delete" EstimatedTotalSubtreeCost="8.56272">
<OutputList />
<Update WithUnorderedPrefetch="true" DMLRequestSort="false">
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[UK_Production_Detail]" Alias="[pd]" IndexKind="NonClustered" />
<RelOp AvgRowSize="36" EstimateCPU="0.00182568" EstimateIO="0.00328238" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Eager Spool" NodeId="3" Parallel="false" PhysicalOp="Table Spool" EstimatedTotalSubtreeCost="8.08456">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Meta_Data_ID" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time_Local" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="IntegratedDM" />
</OutputList>
<Spool>
<RelOp AvgRowSize="36" EstimateCPU="0.02" EstimateIO="1.31642" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Delete" NodeId="4" Parallel="false" PhysicalOp="Clustered Index Delete" EstimatedTotalSubtreeCost="32.3067">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Meta_Data_ID" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time_Local" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="IntegratedDM" />
</OutputList>
<Update WithUnorderedPrefetch="true" DMLRequestSort="false">
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[PK_Production_Detail]" Alias="[pd]" IndexKind="Clustered" />
<RelOp AvgRowSize="15" EstimateCPU="0.002" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Top" NodeId="6" Parallel="false" PhysicalOp="Top" EstimatedTotalSubtreeCost="30.9703">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</OutputList>
<Top RowCount="false" IsPercent="false" WithTies="false">
<TopExpression>
<ScalarOperator ScalarString="(20000)">
<Const ConstValue="(20000)" />
</ScalarOperator>
</TopExpression>
<RelOp AvgRowSize="15" EstimateCPU="0.0392491" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Gather Streams" NodeId="7" Parallel="true" PhysicalOp="Parallelism" EstimatedTotalSubtreeCost="30.9683">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</OutputList>
<Parallelism>
<RelOp AvgRowSize="15" EstimateCPU="276.841" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Right Semi Join" NodeId="8" Parallel="true" PhysicalOp="Hash Match" EstimatedTotalSubtreeCost="30.929">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</OutputList>
<MemoryFractions Input="1" Output="1" />
<Hash>
<DefinedValues />
<HashKeysBuild>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</HashKeysBuild>
<HashKeysProbe>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</HashKeysProbe>
<ProbeResidual>
<ScalarOperator ScalarString="[DataWarehouse].[dbo].[Production_Detail].[Id] as [pd].[Id]=[tempdb].[dbo].[#ToPurge].[Id] as [tp].[Id]">
<Compare CompareOp="EQ">
<ScalarOperator>
<Identifier>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Identifier>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</Identifier>
</ScalarOperator>
</Compare>
</ScalarOperator>
</ProbeResidual>
<RelOp AvgRowSize="15" EstimateCPU="2.83429" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="3910180" LogicalOp="Bitmap Create" NodeId="9" Parallel="true" PhysicalOp="Bitmap" EstimatedTotalSubtreeCost="9.99726">
<OutputList>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</OutputList>
<Bitmap>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Bitmap1007" />
</DefinedValue>
</DefinedValues>
<HashKeys>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</HashKeys>
<RelOp AvgRowSize="15" EstimateCPU="2.83429" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="3910180" LogicalOp="Repartition Streams" NodeId="10" Parallel="true" PhysicalOp="Parallelism" EstimatedTotalSubtreeCost="9.99726">
<OutputList>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</OutputList>
<Parallelism PartitioningType="Hash">
<PartitionColumns>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</PartitionColumns>
<RelOp AvgRowSize="15" EstimateCPU="1.07532" EstimateIO="6.08765" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="3910180" LogicalOp="Table Scan" NodeId="11" Parallel="true" PhysicalOp="Table Scan" EstimatedTotalSubtreeCost="7.16297" TableCardinality="3910180">
<OutputList>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</OutputList>
<TableScan Ordered="false" ForcedIndex="false" ForceScan="false" NoExpandHint="false">
<DefinedValues>
<DefinedValue>
<ColumnReference Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" Column="Id" />
</DefinedValue>
</DefinedValues>
<Object Database="[tempdb]" Schema="[dbo]" Table="[#ToPurge]" Alias="[tp]" IndexKind="Heap" />
</TableScan>
</RelOp>
</Parallelism>
</RelOp>
</Bitmap>
</RelOp>
<RelOp AvgRowSize="15" EstimateCPU="0.675882" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="902193" LogicalOp="Repartition Streams" NodeId="12" Parallel="true" PhysicalOp="Parallelism" EstimatedTotalSubtreeCost="3.17684">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</OutputList>
<Parallelism PartitioningType="Hash">
<PartitionColumns>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</PartitionColumns>
<RelOp AvgRowSize="15" EstimateCPU="43.216" EstimateIO="391.867" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="902193" LogicalOp="Index Scan" NodeId="13" Parallel="true" PhysicalOp="Index Scan" EstimatedTotalSubtreeCost="2.50096" TableCardinality="157149000">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</OutputList>
<IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore">
<DefinedValues>
<DefinedValue>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</DefinedValue>
</DefinedValues>
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[UK_Production_Detail]" Alias="[pd]" IndexKind="NonClustered" />
<Predicate>
<ScalarOperator ScalarString="PROBE([Bitmap1007],[DataWarehouse].[dbo].[Production_Detail].[Id] as [pd].[Id],N'[IN ROW]')">
<Intrinsic FunctionName="PROBE">
<ScalarOperator>
<Identifier>
<ColumnReference Column="Bitmap1007" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Identifier>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Const ConstValue="N'[IN ROW]'" />
</ScalarOperator>
</Intrinsic>
</ScalarOperator>
</Predicate>
</IndexScan>
</RelOp>
</Parallelism>
</RelOp>
</Hash>
</RelOp>
</Parallelism>
</RelOp>
</Top>
</RelOp>
</Update>
</RelOp>
</Spool>
</RelOp>
</Update>
</RelOp>
<RelOp AvgRowSize="9" EstimateCPU="0.02" EstimateIO="0.906841" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Delete" NodeId="16" Parallel="false" PhysicalOp="Index Delete" EstimatedTotalSubtreeCost="9.0114">
<OutputList />
<Update WithUnorderedPrefetch="true" DMLRequestSort="false">
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[IX_Production_Detail_Production_Detail_Time_Local]" Alias="[pd]" IndexKind="NonClustered" />
<RelOp AvgRowSize="36" EstimateCPU="0.00182568" EstimateIO="0.00328238" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Eager Spool" NodeId="18" Parallel="false" PhysicalOp="Table Spool" EstimatedTotalSubtreeCost="8.08456">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Meta_Data_ID" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time_Local" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="IntegratedDM" />
</OutputList>
<Spool PrimaryNodeId="3" />
</RelOp>
</Update>
</RelOp>
<RelOp AvgRowSize="9" EstimateCPU="0.02" EstimateIO="0.458164" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Delete" NodeId="19" Parallel="false" PhysicalOp="Index Delete" EstimatedTotalSubtreeCost="8.56272">
<OutputList />
<Update WithUnorderedPrefetch="true" DMLRequestSort="false">
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[IX_Production_Detail_Meta_Data_ID_Production_Detail_Time]" Alias="[pd]" IndexKind="NonClustered" />
<RelOp AvgRowSize="36" EstimateCPU="0.00182568" EstimateIO="0.00328238" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Eager Spool" NodeId="21" Parallel="false" PhysicalOp="Table Spool" EstimatedTotalSubtreeCost="8.08456">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Meta_Data_ID" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time_Local" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="IntegratedDM" />
</OutputList>
<Spool PrimaryNodeId="3" />
</RelOp>
</Update>
</RelOp>
<RelOp AvgRowSize="9" EstimateCPU="0.02" EstimateIO="0.478182" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Delete" NodeId="22" Parallel="false" PhysicalOp="Index Delete" EstimatedTotalSubtreeCost="8.58274">
<OutputList />
<Update WithUnorderedPrefetch="true" DMLRequestSort="false">
<Object Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Index="[IX_Production_Detail_IntegratedDM_MetaDataId]" Alias="[pd]" IndexKind="NonClustered" />
<RelOp AvgRowSize="36" EstimateCPU="0.00182568" EstimateIO="0.00328238" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="20000" LogicalOp="Eager Spool" NodeId="24" Parallel="false" PhysicalOp="Table Spool" EstimatedTotalSubtreeCost="8.08456">
<OutputList>
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Id" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Meta_Data_ID" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="Production_Detail_Time_Local" />
<ColumnReference Database="[DataWarehouse]" Schema="[dbo]" Table="[Production_Detail]" Alias="[pd]" Column="IntegratedDM" />
</OutputList>
<Spool PrimaryNodeId="3" />
</RelOp>
</Update>
</RelOp>
</Sequence>
</RelOp>
</QueryPlan>
</StmtSimple>
</Statements>
</Batch>
</BatchSequence>
</ShowPlanXML>
Yürütme planında görebileceğiniz gibi, optimize edici birincil birincil kümelenmiş dizinini kullanmaz, bunun yerine Kimlik alanını içermeyen Benzersiz anahtarını kullanır. Ben doğru kilit kullanıyorsa, daha fazla sayfa kilitlenmesi gerektiğinden bu yüzden kilitlenme neden olduğunu düşünüyorum.
Id ile kümelenmemiş bir dizin eklemek çalışın ve bundan sonra optimizer kullanıyor.
CREATE UNIQUE NONCLUSTERED INDEX [NonClusteredIndex-20160617-104555]
ON [dbo].[Production_Detail] ([Id] ASC)
GO
İyileştiricinin neden kümelenmiş dizini kullanmadığını, ancak kümelenmemiş olanı kullandığını bilmek istiyorum?