Gof*_*oke 6 sql-server optimization execution-plan plan-guides
我有一个需要计划指南的查询，但我很难设置它。
从过程缓存中查询以下...
(@state nvarchar(14),
@jobName nvarchar(18),
@jobGroup nvarchar(28),
@oldState nvarchar(6))
UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state
WHERE JOB_NAME = @jobName
AND JOB_GROUP = @jobGroup
AND TRIGGER_STATE = @oldState
SQL Server 选择执行聚集索引扫描与非聚集索引查找。我在这个更新语句和表上的某个 select 语句中遇到了零星的死锁问题。我理解为什么 SQL 选择对表进行聚集索引扫描....Rows < 100 和 PageCount < 25。
该表有大量活动，由于它是第 3 方产品，我无法修改查询并提供索引提示。使用非聚集索引的查询成本更高，但我相信它会基于测试提高并发性....
我需要告诉它使用下面的非聚集索引
WITH (INDEX (ix_jobname_jobgroup_triggerstate))
帮助设置这个将不胜感激..
理想情况下，我们希望使用计划指南添加TABLE HINT，因此引导查询变为：
UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state
WHERE JOB_NAME = @jobName
AND JOB_GROUP = @jobGroup
AND TRIGGER_STATE = @oldState
OPTION (TABLE HINT (JOB_TRIGGERS, INDEX(ix_jobname_jobgroup_triggerstate)));
不幸的是，这是不可能的，因为它UPDATE是在没有FROM子句的情况下编写的：
消息 8724，级别 16，状态 1，第 45 行
无法执行查询。不能在 TABLE HINT 子句中指定表值或 OPENROWSET 函数“JOB_TRIGGERS”。
您可以通过捕获等效的 XML 显示计划来解决此问题：
UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state
FROM JOB_TRIGGERS WITH (INDEX(ix_jobname_jobgroup_triggerstate))
WHERE JOB_NAME = @jobName
AND JOB_GROUP = @jobGroup
AND TRIGGER_STATE = @oldState
注意这种形式的查询有一个FROM子句来支持索引提示。查询必须完全如上编写，没有目标表的常用别名。
然后，您可以使用此 XML（不带开头<?xml version="1.0" encoding="utf-16"?>）元素作为 中的@hints参数sp_create_plan_guide。
给定表和索引：
CREATE TABLE dbo.JOB_TRIGGERS
(
JOB_TRIGGERS_ID integer PRIMARY KEY,
JOB_NAME nvarchar(18) NOT NULL,
JOB_GROUP nvarchar(28) NOT NULL,
TRIGGER_STATE nvarchar(6) NOT NULL,
);
CREATE NONCLUSTERED INDEX
ix_jobname_jobgroup_triggerstate
ON dbo.JOB_TRIGGERS
(JOB_NAME, JOB_GROUP, TRIGGER_STATE);
计划指南（使用从上面的索引提示表单中捕获的 XML）是：
EXECUTE sys.sp_create_plan_guide
@name = N'UPDATE JOB_TRIGGERS using nonclustered index',
@stmt = N'UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state
WHERE JOB_NAME = @jobName
AND JOB_GROUP = @jobGroup
AND TRIGGER_STATE = @oldState',
@type = N'SQL',
@module_or_batch = NULL,
@params = N'@state nvarchar(14), @jobName nvarchar(18), @jobGroup nvarchar(28), @oldState nvarchar(6)',
@hints = N'<ShowPlanXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.5" Build="13.0.4411.0" xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan">
<BatchSequence>
<Batch>
<Statements>
<StmtSimple StatementCompId="1" StatementEstRows="1" StatementId="1" StatementOptmLevel="FULL" StatementOptmEarlyAbortReason="GoodEnoughPlanFound" CardinalityEstimationModelVersion="130" StatementSubTreeCost="0.0365109" StatementText="DECLARE
 @state nvarchar(14),
 @jobName nvarchar(18),
 @jobGroup nvarchar(28),
 @oldState nvarchar(6);

UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state 
FROM JOB_TRIGGERS WITH (INDEX(ix_jobname_jobgroup_triggerstate))
WHERE JOB_NAME = @jobName 
AND JOB_GROUP = @jobGroup 
AND TRIGGER_STATE = @oldState" StatementType="UPDATE" QueryHash="0xA993366BDAC14B06" QueryPlanHash="0x21B868F786AB4C56" RetrievedFromCache="false" SecurityPolicyApplied="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="40" CompileTime="2" CompileCPU="2" CompileMemory="320">
<MemoryGrantInfo SerialRequiredMemory="0" SerialDesiredMemory="0" />
<OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="209715" EstimatedPagesCached="52428" EstimatedAvailableDegreeOfParallelism="2" MaxCompileMemory="6723992" />
<RelOp AvgRowSize="9" EstimateCPU="2E-06" EstimateIO="0.02" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Update" NodeId="1" Parallel="false" PhysicalOp="Clustered Index Update" EstimatedTotalSubtreeCost="0.0365109">
<OutputList />
<Update DMLRequestSort="false">
<Object Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Index="[PK__JOB_TRIG__CF66DD90CB121F34]" IndexKind="Clustered" Storage="RowStore" />
<Object Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Index="[ix_jobname_jobgroup_triggerstate]" IndexKind="NonClustered" Storage="RowStore" />
<SetPredicate>
<ScalarOperator ScalarString="[Sandpit].[dbo].[JOB_TRIGGERS].[TRIGGER_STATE] = RaiseIfNullUpdate([Expr1002])">
<ScalarExpressionList>
<ScalarOperator>
<MultipleAssign>
<Assign>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
<ScalarOperator>
<Intrinsic FunctionName="RaiseIfNullUpdate">
<ScalarOperator>
<Identifier>
<ColumnReference Column="Expr1002" />
</Identifier>
</ScalarOperator>
</Intrinsic>
</ScalarOperator>
</Assign>
</MultipleAssign>
</ScalarOperator>
</ScalarExpressionList>
</ScalarOperator>
</SetPredicate>
<RelOp AvgRowSize="25" EstimateCPU="1E-07" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Compute Scalar" NodeId="2" Parallel="false" PhysicalOp="Compute Scalar" EstimatedTotalSubtreeCost="0.0165089">
<OutputList>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1008" />
</OutputList>
<ComputeScalar>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Expr1008" />
<ScalarOperator ScalarString="[Expr1008]">
<Identifier>
<ColumnReference Column="Expr1008" />
</Identifier>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="25" EstimateCPU="1E-07" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Compute Scalar" NodeId="3" Parallel="false" PhysicalOp="Compute Scalar" EstimatedTotalSubtreeCost="0.0165089">
<OutputList>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1008" />
</OutputList>
<ComputeScalar>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Expr1008" />
<ScalarOperator ScalarString="CASE WHEN [Expr1005] THEN (0) ELSE (1) END">
<IF>
<Condition>
<ScalarOperator>
<Identifier>
<ColumnReference Column="Expr1005" />
</Identifier>
</ScalarOperator>
</Condition>
<Then>
<ScalarOperator>
<Const ConstValue="(0)" />
</ScalarOperator>
</Then>
<Else>
<ScalarOperator>
<Const ConstValue="(1)" />
</ScalarOperator>
</Else>
</IF>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="22" EstimateCPU="1E-07" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Compute Scalar" NodeId="4" Parallel="false" PhysicalOp="Compute Scalar" EstimatedTotalSubtreeCost="0.0165088">
<OutputList>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1005" />
</OutputList>
<ComputeScalar>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Expr1002" />
<ScalarOperator ScalarString="CONVERT_IMPLICIT(nvarchar(6),[@state],0)">
<Identifier>
<ColumnReference Column="ConstExpr1006">
<ScalarOperator>
<Convert DataType="nvarchar" Length="12" Style="0" Implicit="true">
<ScalarOperator>
<Identifier>
<ColumnReference Column="@state" />
</Identifier>
</ScalarOperator>
</Convert>
</ScalarOperator>
</ColumnReference>
</Identifier>
</ScalarOperator>
</DefinedValue>
<DefinedValue>
<ColumnReference Column="Expr1005" />
<ScalarOperator ScalarString="CASE WHEN [Sandpit].[dbo].[JOB_TRIGGERS].[TRIGGER_STATE] = CONVERT_IMPLICIT(nvarchar(6),[@state],0) THEN (1) ELSE (0) END">
<IF>
<Condition>
<ScalarOperator>
<Compare CompareOp="BINARY IS">
<ScalarOperator>
<Identifier>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Identifier>
<ColumnReference Column="ConstExpr1006">
<ScalarOperator>
<Convert DataType="nvarchar" Length="12" Style="0" Implicit="true">
<ScalarOperator>
<Identifier>
<ColumnReference Column="@state" />
</Identifier>
</ScalarOperator>
</Convert>
</ScalarOperator>
</ColumnReference>
</Identifier>
</ScalarOperator>
</Compare>
</ScalarOperator>
</Condition>
<Then>
<ScalarOperator>
<Const ConstValue="(1)" />
</ScalarOperator>
</Then>
<Else>
<ScalarOperator>
<Const ConstValue="(0)" />
</ScalarOperator>
</Else>
</IF>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="21" EstimateCPU="0.00010056" EstimateIO="0.013125" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Eager Spool" NodeId="5" Parallel="false" PhysicalOp="Table Spool" EstimatedTotalSubtreeCost="0.0165087">
<OutputList>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
</OutputList>
<Spool>
<RelOp AvgRowSize="21" EstimateCPU="0.0001581" EstimateIO="0.003125" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" EstimatedRowsRead="1" LogicalOp="Index Seek" NodeId="6" Parallel="false" PhysicalOp="Index Seek" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0">
<OutputList>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
</OutputList>
<IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="true" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore">
<DefinedValues>
<DefinedValue>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_TRIGGERS_ID" />
</DefinedValue>
<DefinedValue>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
</DefinedValue>
</DefinedValues>
<Object Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Index="[ix_jobname_jobgroup_triggerstate]" IndexKind="NonClustered" Storage="RowStore" />
<SeekPredicates>
<SeekPredicateNew>
<SeekKeys>
<Prefix ScanType="EQ">
<RangeColumns>
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_NAME" />
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="JOB_GROUP" />
<ColumnReference Database="[Sandpit]" Schema="[dbo]" Table="[JOB_TRIGGERS]" Column="TRIGGER_STATE" />
</RangeColumns>
<RangeExpressions>
<ScalarOperator ScalarString="[@jobName]">
<Identifier>
<ColumnReference Column="@jobName" />
</Identifier>
</ScalarOperator>
<ScalarOperator ScalarString="[@jobGroup]">
<Identifier>
<ColumnReference Column="@jobGroup" />
</Identifier>
</ScalarOperator>
<ScalarOperator ScalarString="[@oldState]">
<Identifier>
<ColumnReference Column="@oldState" />
</Identifier>
</ScalarOperator>
</RangeExpressions>
</Prefix>
</SeekKeys>
</SeekPredicateNew>
</SeekPredicates>
</IndexScan>
</RelOp>
</Spool>
</RelOp>
</ComputeScalar>
</RelOp>
</ComputeScalar>
</RelOp>
</ComputeScalar>
</RelOp>
</Update>
</RelOp>
</QueryPlan>
</StmtSimple>
</Statements>
</Batch>
</BatchSequence>
</ShowPlanXML>';
提交查询：
EXECUTE sys.sp_executesql
@stmt = N'UPDATE JOB_TRIGGERS
SET TRIGGER_STATE = @state
WHERE JOB_NAME = @jobName
AND JOB_GROUP = @jobGroup
AND TRIGGER_STATE = @oldState',
@params = N'@state nvarchar(14), @jobName nvarchar(18), @jobGroup nvarchar(28), @oldState nvarchar(6)',
@state = N'', @jobName = N'', @jobGrou
| 归档时间： |
|
| 查看次数： |
656 次 |
| 最近记录： |