A Microsoft distribui o Microsoft SQL Server 2008 e o 2008 R2 correções como um arquivo que pode ser baixado. Como as correções são cumulativas, cada nova versão contém todos os hotfixes e todas as correções de segurança incluídas na versão anterior do SQL Server 2008 e do 2008 R2.
Sintomas
Considere o seguinte cenário:
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Você instala o Microsoft SQL Server 2008 Reporting Services para Microsoft SQL Server 2008 Service Pack 2 (SP2) atualização cumulativa 1.
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Você cria um projeto de servidor de relatório no Microsoft SQL Server 2008 Business Intelligence Development Studio (BIDS).
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Você cria uma região de dados do Tablix no relatório. Ocorre uma quebra de página na região de dados do Tablix . Por exemplo, uma quebra de página é inserida na região de dados do Tablix porque o tamanho da página é restringido ou você insere uma quebra de página lógica na região de dados do Tablix .
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Você exporta o relatório para um arquivo em formato PDF (Portable Document Format) ou um arquivo TIFF (Tagged Image File Format).
Nesse cenário, a seguinte mensagem de erro é exibida:
Um item com a mesma chave já foi adicionado.
Além disso, o arquivo PDF ou TIFF não abre se você tentar abri-lo.
Resolução
Informações sobre a atualização cumulativa
SQL Server 2008 R2
A correção para esse problema foi lançada pela primeira vez na atualização cumulativa 6. Para obter mais informações sobre como obter este pacote de atualização cumulativa do SQL Server 2008 R2, clique no número abaixo para ler o artigo na base de dados de conhecimento da Microsoft:
2489376 Pacote de atualizações cumulativas 6 para SQL Server 2008 R2 Observação Como as compilações são cumulativas, cada nova versão de correção contém todos os hotfixes e todas as correções de segurança incluídas na versão anterior do SQL Server 2008 R2. Recomendamos que você considere a aplicação do lançamento de correção mais recente que contém esse hotfix. Para obter mais informações, clique no número abaixo para ler os artigos na Base de Dados de Conhecimento Microsoft:
981356 As compilações do SQL Server 2008 R2 que foram lançadas após a liberação do SQL Server 2008 R2A correção para esse problema foi lançada pela primeira vez na atualização cumulativa 2 do SQL Server 2008 Service Pack 2. Para obter mais informações sobre esse pacote de atualizações cumulativas, clique no número abaixo para ler o artigo na base de dados de conhecimento da Microsoft:
2467239 Pacote de atualizações cumulativas 2 para SQL Server 2008 Service Pack 2Observação Como as compilações são cumulativas, cada nova versão de correção contém todos os hotfixes e todas as correções de segurança incluídas na versão anterior do SQL Server 2008 Fix. A Microsoft recomenda que você considere a aplicação do lançamento de correção mais recente que contém esse hotfix. Para obter mais informações, clique no número abaixo para ler os artigos na Base de Dados de Conhecimento Microsoft:
2402659 As compilações do SQL Server 2008 lançadas após o lançamento do SQL Server 2008 Service Pack 2 Hotfixes do Microsoft SQL Server 2008 são criados para Service Packs específicos do SQL Server. Você deve aplicar um hotfix do SQL Server 2008 Service Pack 2 a uma instalação do SQL Server 2008 Service Pack 2. Por padrão, qualquer hotfix fornecido em um Service Pack do SQL Server está incluído no próximo Service Pack do SQL Server.
Status
A Microsoft confirmou que este é um problema nos produtos Microsoft listados na seção "Aplicável a".
Informações adicionais
Informações de pilha de chamadas
Quando esse problema ocorre, uma pilha de chamadas que se assemelha às seguintes informações é registrada no arquivo de log do Reporting Services:reportrendering!ReportServer_0-4!8cc!: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: , Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: An error occurred during rendering of the report. ---> Microsoft.ReportingServices.OnDemandReportRendering.ReportRenderingException: An error occurred during rendering of the report. ---> System.ArgumentException: An item with the same key has already been added.at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.WriteStartItemToStream(RPLWriter rplWriter, PageContext pageContext)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.SubReport.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.ReportSection.NextPage(RPLWriter rplWriter, Int32 pageNumber, Int32 totalPages, Double top, Double availableHeight, ReportSection nextSection, Boolean isFirstSectionOnPage)at Microsoft.ReportingServices.Rendering.HPBProcessing.Report.NextPage(RPLWriter rplWriter, Int32 totalPages)at Microsoft.ReportingServices.Rendering.HPBProcessing.HPBProcessing.GetNextPage(RPLReport& rplReport)at Microsoft.ReportingServices.Rendering.ImageRenderer.PDFRenderer.Render(Report report, NameValueCollection deviceInfo, Hashtable renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)--- End of inner exception stack trace ---at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderFromOdpSnapshot(IRenderingExtension newRenderer, String streamName, ProcessingContext pc, RenderingContext rc)--- End of inner exception stack trace ---;library!ReportServer_0-4!8cc!:: i INFO: Exception UnhandledReportRenderingException dumped to: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\Logfiles flags= AllMemory, AllThreads, SendToWatson date-time : e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: , Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: An error occurred during rendering of the report. ---> Microsoft.ReportingServices.OnDemandReportRendering.ReportRenderingException: An error occurred during rendering of the report. ---> System.ArgumentException: An item with the same key has already been added.at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.WriteStartItemToStream(RPLWriter rplWriter, PageContext pageContext)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.SubReport.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.ReportSection.NextPage(RPLWriter rplWriter, Int32 pageNumber, Int32 totalPages, Double top, Double availableHeight, ReportSection nextSection, Boolean isFirstSectionOnPage)at Microsoft.ReportingServices.Rendering.HPBProcessing.Report.NextPage(RPLWriter rplWriter, Int32 totalPages)at Microsoft.ReportingServices.Rendering.HPBProcessing.HPBProcessing.GetNextPage(RPLReport& rplReport)at Microsoft.ReportingServices.Rendering.ImageRenderer.PDFRenderer.Render(Report report, NameValueCollection deviceInfo, Hashtable renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)--- End of inner exception stack trace ---at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderFromOdpSnapshot(IRenderingExtension newRenderer, String streamName, ProcessingContext pc, RenderingContext rc)--- End of inner exception stack trace ---;library!ReportServer_0-4!8cc!:: i INFO: Exception UnhandledReportRenderingException dumped to: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\Logfiles flags= AllMemory, AllThreads, SendToWatson date-time : i INFO: Exception UnhandledReportRenderingException dumped to: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\Logfiles flags= AllMemory, AllThreads, SendToWatson date-time : e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: , Microsoft.ReportingServices.ReportProcessing.UnhandledReportRenderingException: An error occurred during rendering of the report. ---> Microsoft.ReportingServices.OnDemandReportRendering.ReportRenderingException: An error occurred during rendering of the report. ---> System.ArgumentException: An item with the same key has already been added.at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.WriteStartItemToStream(RPLWriter rplWriter, PageContext pageContext)at Microsoft.ReportingServices.Rendering.HPBProcessing.TextBox.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.SubReport.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState)at Microsoft.ReportingServices.Rendering.HPBProcessing.ReportSection.NextPage(RPLWriter rplWriter, Int32 pageNumber, Int32 totalPages, Double top, Double availableHeight, ReportSection nextSection, Boolean isFirstSectionOnPage)at Microsoft.ReportingServices.Rendering.HPBProcessing.Report.NextPage(RPLWriter rplWriter, Int32 totalPages)at Microsoft.ReportingServices.Rendering.HPBProcessing.HPBProcessing.GetNextPage(RPLReport& rplReport)at Microsoft.ReportingServices.Rendering.ImageRenderer.PDFRenderer.Render(Report report, NameValueCollection deviceInfo, Hashtable renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)--- End of inner exception stack trace ---at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderFromOdpSnapshot(IRenderingExtension newRenderer, String streamName, ProcessingContext pc, RenderingContext rc)--- End of inner exception stack trace ---;library!ReportServer_0-4!8cc!:: i INFO: Exception UnhandledReportRenderingException dumped to: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\Logfiles flags= AllMemory, AllThreads, SendToWatson date-time : i INFO: Exception UnhandledReportRenderingException dumped to: C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\Logfiles flags= AllMemory, AllThreads, SendToWatson
Referências
Para obter mais informações sobre a renderização, acesse o seguinte site do Microsoft TechNet:
Gereral informações sobre renderizaçãoPara obter mais informações sobre como usar regiões de dados do Tablix , acesse o seguinte site da Microsoft Developer Network (MSDN):
