Question

我正在尝试使用Sql server 2012 Spatial Data为我的客户存储地理位置。我有一个搜索屏幕，我需要找到所有客户，在输入位置50英里。

我有300万行，当我在没有索引提示的情况下尝试下面的查询时，它需要3到4秒。但随着查询提示它瞬间。

Select top 10 * from Customer with (Index(IDX_Location) )
where Location.STDistance(0xE6100000010C0600004075383E40FEFFFF1F706354C0) 
<= (50 *    1609.344)

我错误地使用了这个吗？是否可以仅将提示用于Spatial搜索？我无法承受每次搜索4秒的延迟，

更新

这是没有查询提示的执行计划

<?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="11.0.2218.0" xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan">
  <BatchSequence>
    <Batch>
      <Statements>
        <StmtSimple StatementCompId="1" StatementEstRows="10" StatementId="1" StatementOptmLevel="FULL" StatementOptmEarlyAbortReason="GoodEnoughPlanFound" StatementSubTreeCost="0.0371276" StatementText="      Select top 10 * from Customer &#xD;&#xA;   where Location.STDistance(0xE6100000010C0600004075383E40FEFFFF1F706354C0) &lt;= (50 * 1609.344)&#xD;&#xA;" StatementType="SELECT" QueryHash="0x8FD6DFA68AC6E7AF" QueryPlanHash="0xFD53392CE2607CF0" RetrievedFromCache="true">
          <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="9" CompileCPU="8" CompileMemory="344">
            <GuessedSelectivity>
              <Spatial />
            </GuessedSelectivity>
            <Warnings SpatialGuess="true" />
            <MemoryGrantInfo SerialRequiredMemory="0" SerialDesiredMemory="0" />
            <OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="414457" EstimatedPagesCached="51807" EstimatedAvailableDegreeOfParallelism="2" />
            <RelOp AvgRowSize="13195" EstimateCPU="1E-06" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="10" LogicalOp="Top" NodeId="0" Parallel="false" PhysicalOp="Top" EstimatedTotalSubtreeCost="0.0371276">
              <OutputList>
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Id" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FirstName" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="LastName" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CountryCd" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Zip" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CustomerSummary" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IFollowCount" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FollowingMeCount" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="PhotoUrl" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsTutor" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="SearchName" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="City" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsStudent" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Competition" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="MediaBroadcast" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="DiplomasHonors" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Longitude" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Latitude" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_email" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_Ph" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link1" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link2" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link3" />
                <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="HeadLine" />
              </OutputList>
              <Top RowCount="false" IsPercent="false" WithTies="false">
                <TopExpression>
                  <ScalarOperator ScalarString="(10)">
                    <Const ConstValue="(10)" />
                  </ScalarOperator>
                </TopExpression>
                <RelOp AvgRowSize="13195" EstimateCPU="3467.57" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="10" LogicalOp="Filter" NodeId="1" Parallel="false" PhysicalOp="Filter" EstimatedTotalSubtreeCost="0.0371266">
                  <OutputList>
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Id" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FirstName" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="LastName" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CountryCd" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Zip" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CustomerSummary" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IFollowCount" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FollowingMeCount" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="PhotoUrl" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsTutor" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="SearchName" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="City" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsStudent" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Competition" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="MediaBroadcast" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="DiplomasHonors" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Longitude" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Latitude" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_email" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_Ph" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link1" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link2" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link3" />
                    <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="HeadLine" />
                  </OutputList>
                  <Filter StartupExpression="false">
                    <RelOp AvgRowSize="13195" EstimateCPU="3.81189" EstimateIO="48.435" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="33.3333" LogicalOp="Clustered Index Scan" NodeId="2" Parallel="false" PhysicalOp="Clustered Index Scan" EstimatedTotalSubtreeCost="0.00377058" TableCardinality="3465210">
                      <OutputList>
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Id" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FirstName" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="LastName" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CountryCd" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Zip" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CustomerSummary" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IFollowCount" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FollowingMeCount" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="PhotoUrl" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsTutor" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="SearchName" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="City" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsStudent" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Competition" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="MediaBroadcast" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="DiplomasHonors" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Longitude" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Latitude" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_email" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_Ph" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link1" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link2" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link3" />
                        <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="HeadLine" />
                      </OutputList>
                      <Warnings>
                        <ColumnsWithNoStatistics>
                          <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                        </ColumnsWithNoStatistics>
                      </Warnings>
                      <IndexScan Ordered="false" ForcedIndex="false" ForceScan="false" NoExpandHint="false">
                        <DefinedValues>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Id" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FirstName" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="LastName" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CountryCd" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Zip" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="CustomerSummary" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IFollowCount" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="FollowingMeCount" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="PhotoUrl" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsTutor" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="SearchName" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="City" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="IsStudent" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Competition" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="MediaBroadcast" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="DiplomasHonors" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Longitude" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Latitude" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_email" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="contact_Ph" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link1" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link2" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Link3" />
                          </DefinedValue>
                          <DefinedValue>
                            <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="HeadLine" />
                          </DefinedValue>
                        </DefinedValues>
                        <Object Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Index="[PK_Customer]" IndexKind="Clustered" />
                      </IndexScan>
                    </RelOp>
                    <Predicate>
                      <ScalarOperator ScalarString="[MyDataBase].[dbo].[Customer].[Location].STDistance(CONVERT_IMPLICIT(varbinary(max),0xE6100000010C0600004075383E40FEFFFF1F706354C0,0).)&lt;=(8.046720000000000e+004)">
                        <Compare CompareOp="LE">
                          <ScalarOperator>
                            <UDTMethod>
                              <CLRFunction Assembly="Microsoft.SqlServer.Types" Class="Microsoft.SqlServer.Types.SqlGeography" Method="STDistance" />
                              <ScalarOperator>
                                <Identifier>
                                  <ColumnReference Database="[MyDataBase]" Schema="[dbo]" Table="[Customer]" Column="Location" />
                                </Identifier>
                              </ScalarOperator>
                              <ScalarOperator>
                                <Identifier>
                                  <ColumnReference Column="ConstExpr1003">
                                    <ScalarOperator>
                                      <UDTMethod>
                                        <CLRFunction Assembly="Microsoft.SqlServer.Types" Class="Microsoft.SqlServer.Types.SqlGeography" />
                                        <ScalarOperator>
                                          <Convert DataType="varbinary(max)" Length="2147483647" Style="0" Implicit="true">
                                            <ScalarOperator>
                                              <Const ConstValue="0xE6100000010C0600004075383E40FEFFFF1F706354C0" />
                                            </ScalarOperator>
                                          </Convert>
                                        </ScalarOperator>
                                      </UDTMethod>
                                    </ScalarOperator>
                                  </ColumnReference>
                                </Identifier>
                              </ScalarOperator>
                            </UDTMethod>
                          </ScalarOperator>
                          <ScalarOperator>
                            <Const ConstValue="(8.046720000000000e+004)" />
                          </ScalarOperator>
                        </Compare>
                      </ScalarOperator>
                    </Predicate>
                  </Filter>
                </RelOp>
              </Top>
            </RelOp>
          </QueryPlan>
        </StmtSimple>
      </Statements>
    </Batch>
  </BatchSequence>
</ShowPlanXML>

谢谢！

Answer 1

不幸的是，SQL Server查询优化器往往会频繁忽略空间索引，尽管它可能会大大加快查询速度。它是一个众所周知的问题，通常最好使用索引提示进行空间查询，而不是信任QO来单独使用它。

你可以尝试调整你的空间索引，所以也许查询优化器可能会识别它（从来没有证明我自己，只听说这是一个可能的解决方案）。

存储过程sp_help_spatial_geography_index为您提供了一些参数，使您可以更轻松地根据数据点分布和聚类选择正确的空间索引网格密度。

由于50英里半径是一个相当大的区域，我想这可能有助于使用“低”网格密度或至少最高指数级别，所以space is separated into less grid cells，并且查询优化器获得的候选单元格返回的索引单元格较少，这应该会对其使用空间索引的决定产生影响。

在Sql server中更快地进行空间搜索

1 个答案: