提高sql ip查询数据库的查询次数
提高sql ip查询数据库的查询次数
提问于 2010-07-05 11:21:10
我在server 2005中有一个表，它包含一个ip范围和相应的信息(country / city / etc)。大约有300万行，根据下面的查询返回记录需要半秒钟多一点时间。
DECLARE @ip BIGINT
SELECT @ip=3561360969
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip and @ip <= ipto有人能提供任何建议来改善查询时间，因为我正在构建的系统需要每秒处理大约10个这样的查询。我已经做了以下工作，这并没有大大提高查询时间.
- 将数据库设置为只读
- 使用NOLOCK表提示
- 索引ipto &ipto列
任何想法都将不胜感激！
时间
编辑: xml执行计划如下：
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
* <ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.0" Build="9.00.4053.00"><BatchSequence><Batch><Statements><StmtSimple StatementText="set statistics time on

" StatementId="1" StatementCompId="1" StatementType="SET STATS"/><StmtSimple StatementText="
DECLARE @ip BIGINT
SELECT @ip=3561360969
" StatementId="2" StatementCompId="2" StatementType="ASSIGN"/><StmtSimple StatementText="
SELECT top 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip 
WHERE ipfrom <= @ip and @ip <= ipto

" StatementId="3" StatementCompId="3" StatementType="SELECT" StatementSubTreeCost="0.00337934" StatementEstRows="1" StatementOptmLevel="TRIVIAL"><StatementSetOptions QUOTED_IDENTIFIER="false" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="false" ANSI_NULLS="false" ANSI_PADDING="false" ANSI_WARNINGS="false" NUMERIC_ROUNDABORT="false"/><QueryPlan CachedPlanSize="8" CompileTime="0" CompileCPU="0" CompileMemory="120"><RelOp NodeId="0" PhysicalOp="Top" LogicalOp="Top" EstimateRows="1" EstimateIO="0" EstimateCPU="1e-007" AvgRowSize="393" EstimatedTotalSubtreeCost="0.00337934" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><Top RowCount="0" IsPercent="0" WithTies="0"><TopExpression><ScalarOperator ScalarString="(1)"><Const ConstValue="(1)"/></ScalarOperator></TopExpression><RelOp NodeId="1" PhysicalOp="Clustered Index Scan" LogicalOp="Clustered Index Scan" EstimateRows="1" EstimateIO="28.1505" EstimateCPU="3.77105" AvgRowSize="393" EstimatedTotalSubtreeCost="0.00337724" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><IndexScan Ordered="0" ForcedIndex="0" NoExpandHint="0"><DefinedValues><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></DefinedValue></DefinedValues><Object Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Index="[PK_tbl_IP2]"/><Predicate><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[IPFrom]<=[@ip] AND [@ip]<=[RecruitmentIP].[dbo].[tbl_IP].[IPTo]"><Logical Operation="AND"><ScalarOperator><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator></Compare></ScalarOperator></Logical></ScalarOperator></Predicate></IndexScan></RelOp></Top></RelOp></QueryPlan></StmtSimple><StmtSimple StatementText="
set statistics time off" StatementId="4" StatementCompId="4" StatementType="SET STATS"/></Statements></Batch></BatchSequence></ShowPlanXML>
*/在ipfrom，ipto上索引的执行计划
<ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.0" Build="9.00.4053.00"><BatchSequence><Batch><Statements><StmtSimple StatementText="DECLARE @ip BIGINT
SELECT @ip=3561360969
" StatementId="1" StatementCompId="1" StatementType="ASSIGN"/><StmtSimple StatementText="
SELECT top 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip 
WHERE ipfrom <= @ip and @ip <= ipto
ORDER BY ipto
" StatementId="2" StatementCompId="2" StatementType="SELECT" StatementSubTreeCost="224.264" StatementEstRows="1" StatementOptmLevel="FULL"><StatementSetOptions QUOTED_IDENTIFIER="false" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="false" ANSI_NULLS="false" ANSI_PADDING="false" ANSI_WARNINGS="false" NUMERIC_ROUNDABORT="false"/><QueryPlan CachedPlanSize="10" CompileTime="1" CompileCPU="1" CompileMemory="160"><RelOp NodeId="0" PhysicalOp="Sort" LogicalOp="TopN Sort" EstimateRows="1" EstimateIO="182.872" EstimateCPU="6.45397" AvgRowSize="393" EstimatedTotalSubtreeCost="224.264" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><MemoryFractions Input="0" Output="1"/><TopSort Distinct="0" Rows="1"><OrderBy><OrderByColumn Ascending="1"><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></OrderByColumn></OrderBy><RelOp NodeId="1" PhysicalOp="Clustered Index Scan" LogicalOp="Clustered Index Scan" EstimateRows="308528" EstimateIO="28.1505" EstimateCPU="3.77105" AvgRowSize="393" EstimatedTotalSubtreeCost="31.9216" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><IndexScan Ordered="0" ForcedIndex="0" NoExpandHint="0"><DefinedValues><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></DefinedValue></DefinedValues><Object Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Index="[PK_tbl_IP2]"/><Predicate><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[IPFrom]<=[@ip] AND [@ip]<=[RecruitmentIP].[dbo].[tbl_IP].[IPTo]"><Logical Operation="AND"><ScalarOperator><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator></Compare></ScalarOperator></Logical></ScalarOperator></Predicate></IndexScan></RelOp></TopSort></RelOp></QueryPlan></StmtSimple></Statements></Batch></BatchSequence></ShowPlanXML>马丁史密斯查询的执行计划：
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
* <ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.0" Build="9.00.4053.00"><BatchSequence><Batch><Statements><StmtSimple StatementText="--set showplan_xml on

set statistics time on

" StatementId="1" StatementCompId="1" StatementType="SET STATS"/><StmtSimple StatementText="
DECLARE @ip BIGINT
SELECT @ip=3561360969

" StatementId="2" StatementCompId="2" StatementType="ASSIGN"/><StmtSimple StatementText="
SELECT id, ipfrom, ipto, countrycode, countryname,region,city FROM
(
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip 
WHERE @ip <= ipto
ORDER BY ipto
INTERSECT
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip 
WHERE ipfrom <= @ip
ORDER BY ipfrom DESC
) ip

" StatementId="3" StatementCompId="3" StatementType="SELECT" StatementSubTreeCost="226.409" StatementEstRows="1" StatementOptmLevel="FULL"><StatementSetOptions QUOTED_IDENTIFIER="false" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="false" ANSI_NULLS="false" ANSI_PADDING="false" ANSI_WARNINGS="false" NUMERIC_ROUNDABORT="false"/><QueryPlan CachedPlanSize="33" CompileTime="6" CompileCPU="6" CompileMemory="376"><MissingIndexes><MissingIndexGroup Impact="10.1146"><MissingIndex Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]"><ColumnGroup Usage="INEQUALITY"><Column Name="[IPTo]" ColumnId="3"/></ColumnGroup><ColumnGroup Usage="INCLUDE"><Column Name="[Id]" ColumnId="1"/><Column Name="[IPFrom]" ColumnId="2"/><Column Name="[CountryCode]" ColumnId="4"/><Column Name="[CountryName]" ColumnId="5"/><Column Name="[Region]" ColumnId="6"/><Column Name="[City]" ColumnId="7"/></ColumnGroup></MissingIndex></MissingIndexGroup></MissingIndexes><RelOp NodeId="0" PhysicalOp="Nested Loops" LogicalOp="Left Semi Join" EstimateRows="1" EstimateIO="0" EstimateCPU="4.18e-006" AvgRowSize="86" EstimatedTotalSubtreeCost="226.409" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><NestedLoops Optimized="0"><Predicate><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[Id]=[RecruitmentIP].[dbo].[tbl_IP].[Id] AND [RecruitmentIP].[dbo].[tbl_IP].[IPFrom] = [RecruitmentIP].[dbo].[tbl_IP].[IPFrom] AND [RecruitmentIP].[dbo].[tbl_IP].[IPTo] = [RecruitmentIP].[dbo].[tbl_IP].[IPTo] AND [RecruitmentIP].[dbo].[tbl_IP].[CountryCode] = [RecruitmentIP].[dbo].[tbl_IP].[CountryCode] AND [RecruitmentIP].[dbo].[tbl_IP].[CountryName] = [RecruitmentIP].[dbo].[tbl_IP].[CountryName] AND [RecruitmentIP].[dbo].[tbl_IP].[Region] = [RecruitmentIP].[dbo].[tbl_IP].[Region] AND [RecruitmentIP].[dbo].[tbl_IP].[City] = [RecruitmentIP].[dbo].[tbl_IP].[City]"><Logical Operation="AND"><ScalarOperator><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="IS"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></Identifier></ScalarOperator></Compare></ScalarOperator></Logical></ScalarOperator></Predicate><RelOp NodeId="1" PhysicalOp="Filter" LogicalOp="Filter" EstimateRows="1" EstimateIO="0" EstimateCPU="4.8e-007" AvgRowSize="86" EstimatedTotalSubtreeCost="226.399" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><Filter StartupExpression="0"><RelOp NodeId="2" PhysicalOp="Sort" LogicalOp="TopN Sort" EstimateRows="1" EstimateIO="163.119" EstimateCPU="29.7123" AvgRowSize="86" EstimatedTotalSubtreeCost="226.399" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><MemoryFractions Input="0" Output="0"/><TopSort Distinct="0" Rows="1"><OrderBy><OrderByColumn Ascending="1"><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></OrderByColumn></OrderBy><RelOp NodeId="3" PhysicalOp="Clustered Index Scan" LogicalOp="Clustered Index Scan" EstimateRows="1.02843e+006" EstimateIO="28.1505" EstimateCPU="3.77105" AvgRowSize="86" EstimatedTotalSubtreeCost="31.9216" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><IndexScan Ordered="0" ForcedIndex="0" NoExpandHint="0"><DefinedValues><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></DefinedValue></DefinedValues><Object Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Index="[PK_tbl_IP2]" TableReferenceId="1"/><Predicate><ScalarOperator ScalarString="[@ip]<=[RecruitmentIP].[dbo].[tbl_IP].[IPTo]"><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator></Compare></ScalarOperator></Predicate></IndexScan></RelOp></TopSort></RelOp><Predicate><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[IPFrom]<=[@ip]"><Compare CompareOp="LE"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator></Compare></ScalarOperator></Predicate></Filter></RelOp><RelOp NodeId="5" PhysicalOp="Filter" LogicalOp="Filter" EstimateRows="1" EstimateIO="0" EstimateCPU="4.8e-007" AvgRowSize="86" EstimatedTotalSubtreeCost="0.00985397" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><Filter StartupExpression="0"><RelOp NodeId="6" PhysicalOp="Top" LogicalOp="Top" EstimateRows="1" EstimateIO="0" EstimateCPU="1e-007" AvgRowSize="86" EstimatedTotalSubtreeCost="0.00985349" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><Top RowCount="0" IsPercent="0" WithTies="0"><TopExpression><ScalarOperator ScalarString="(1)"><Const ConstValue="(1)"/></ScalarOperator></TopExpression><RelOp NodeId="7" PhysicalOp="Nested Loops" LogicalOp="Inner Join" EstimateRows="1" EstimateIO="0" EstimateCPU="4.29882" AvgRowSize="86" EstimatedTotalSubtreeCost="0.00985339" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><NestedLoops Optimized="0" WithOrderedPrefetch="1"><OuterReferences><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Column="Expr1006"/></OuterReferences><RelOp NodeId="9" PhysicalOp="Index Seek" LogicalOp="Index Seek" EstimateRows="1" EstimateIO="2.45201" EstimateCPU="1.13142" AvgRowSize="27" EstimatedTotalSubtreeCost="0.0032831" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></OutputList><IndexScan Ordered="1" ScanDirection="BACKWARD" ForcedIndex="0" NoExpandHint="0"><DefinedValues><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></DefinedValue></DefinedValues><Object Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Index="[idx_ipfrom_ipto]" TableReferenceId="2"/><SeekPredicates><SeekPredicate><EndRange ScanType="LE"><RangeColumns><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPFrom"/></RangeColumns><RangeExpressions><ScalarOperator ScalarString="[@ip]"><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator></RangeExpressions></EndRange></SeekPredicate></SeekPredicates></IndexScan></RelOp><RelOp NodeId="11" PhysicalOp="Clustered Index Seek" LogicalOp="Clustered Index Seek" EstimateRows="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="373" EstimatedTotalSubtreeCost="0.00669221" Parallel="0" EstimateRebinds="1" EstimateRewinds="0.797604"><OutputList><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></OutputList><IndexScan Lookup="1" Ordered="1" ScanDirection="FORWARD" ForcedIndex="0" NoExpandHint="0"><DefinedValues><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryCode"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="CountryName"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Region"/></DefinedValue><DefinedValue><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="City"/></DefinedValue></DefinedValues><Object Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Index="[PK_tbl_IP2]" TableReferenceId="-1"/><SeekPredicates><SeekPredicate><Prefix ScanType="EQ"><RangeColumns><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></RangeColumns><RangeExpressions><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[Id]"><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="Id"/></Identifier></ScalarOperator></RangeExpressions></Prefix></SeekPredicate></SeekPredicates></IndexScan></RelOp></NestedLoops></RelOp></Top></RelOp><Predicate><ScalarOperator ScalarString="[RecruitmentIP].[dbo].[tbl_IP].[IPTo]>=[@ip]"><Compare CompareOp="GE"><ScalarOperator><Identifier><ColumnReference Database="[RecruitmentIP]" Schema="[dbo]" Table="[tbl_IP]" Column="IPTo"/></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Column="@ip"/></Identifier></ScalarOperator></Compare></ScalarOperator></Predicate></Filter></RelOp></NestedLoops></RelOp></QueryPlan></StmtSimple><StmtSimple StatementText="
set statistics time off" StatementId="4" StatementCompId="4" StatementType="SET STATS"/></Statements></Batch></BatchSequence></ShowPlanXML>
*/回答 11
Stack Overflow用户
回答已采纳
发布于 2010-07-05 12:14:07
这个表演怎么样？我希望它应该使用ipto上的索引查找来快速解决顶部部分，使用索引查找ipfrom来解析底部部分，使用2(或者可能是一个)书签查找来返回其余的列。
SELECT id, ipfrom, ipto, countrycode, countryname,region,city FROM
(
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE @ip <= ipto
ORDER BY ipto
INTERSECT
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip
ORDER BY ipfrom DESC
) ipStack Overflow用户
发布于 2010-07-05 14:07:32
我认为即使使用索引ipfrom，ipto查询速度慢的主要原因是引擎不能正确地使用索引。
它采用第一个条件ipfrom <= @ip，并能够为此使用索引，但是这个不等式有一个低的选择，如果您的ip范围覆盖所有ips并且不重叠，那么索引对于每个ip索引叶只有一个ipto条目。
这不是很有用，它最终会执行完整的索引扫描(assumption1)。
因此，为了加快速度，有几个窍门
1)如果select @ip_max_delta = max(ipto-ipfrom)不太大(~1000条记录)，您可以添加WHERE ipfrom > (@ip - @ip_max_delta) (只有当ip作为int存储时才能直接使用)。这将很好地适用于任何以ipfrom开头的索引。
2)
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip
ORDER BY ipfrom DESC这应该会很快返回(特别是如果您在ipfrom上集群，并且您应该这样做，因为您的数据很少改变)。
如果上面的内容不能快速返回，您是否可以测试以下查询的执行时间(和计划)，以供参考
SELECT id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom = @ip(选择存在于ipfrom列中的现有@ip )
EDIT2：Re Martin的解决方案
我看不出为什么a)使用交集/子查询和b)来维护两个索引
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip
ORDER BY ipfrom DESC如果在连续行中ipfrom和ipto之间存在关联，则应该返回与Martin的查询相同的内容。如果没有，则可以直接应用附加条件。
SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip AND @ip <= ipto
ORDER BY ipfrom DESC这个查询非常类似于开始的查询，但是ORDER应该允许解析器选择更好的计划(未修改)。如果没有的话
SELECT id, ipfrom, ipto, countrycode, countryname,region,city
FROM
(SELECT TOP 1 id, ipfrom, ipto, countrycode, countryname,region,city
FROM tbl_ip
WHERE ipfrom <= @ip
ORDER BY ipfrom DESC) s
WHERE @ip <= ipto应该做到这一点，并且只需要在ipfrom上进行索引。
Stack Overflow用户
发布于 2010-07-05 12:04:49
我看到了两种减少执行时间的方法。
1.简单的方法是缓存整个3米的记录，并使用.NET本地数据集在IP范围内检索想要的项。这显然会占用您的服务器CPU，但是您不会每秒钟对DB进行10次调用。
2.更难的办法是将IP分成不同的表，如IPRanges1 .IPRanges9。因此，一旦您获得用户IP并希望查询其他详细信息，您只需传递到使用IP的第一位数查询另一个param即可。这将减少3M到3m/9的循环(或类似的东西)。减少执行时间是显而易见的。如果将它与缓存方法结合起来，您将得到一些合适的东西。
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原文链接：
https://stackoverflow.com/questions/3179053
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