数据驱动订阅在连接时超时

我有一个数据驱动的订阅，每次运行时都会在报表管理器中显示“待处理”状态。然后稍微有点错误错误：超时已过期。超时在完成之前经过的时间操作或服务器不是响应。声明一直如此终止。我这里没有做任何特别的事。我的检索用户只能返回2条记录（并在Management studio中立即执行）。报告的数据也不是什么新鲜事。它从3个数据源中提取了大约3个记录 - 所有这些都是基于通过参数传入的ID非常简单的选择。当我将此报告设置为定期发送时，它可以正常工作。只有当我把数据驱动它超时时才会这样。我的配置中的超时设置为默认值（120秒）。这是日志所说的内容。

ReportingServicesService!dbpolling!4!12/20/2010-14:52:03:: EventPolling processing item 3c45f091-aab6-4354-bd1e-e5a8a8103391
ReportingServicesService!dbpolling!c!12/20/2010-14:52:03:: EventPolling processing 1 more items. 1 Total items in internal queue.
ReportingServicesService!library!4!12/20/2010-14:52:03:: Schedule fc2dd7c4-ae29-4e20-a24f-e6d7ee04686d executed at 12/20/2010 2:52:03 PM.
ReportingServicesService!schedule!4!12/20/2010-14:52:03:: Creating Time based subscription notification for subscription: 8a70b89a-bcea-403a-a200-ed0b6e4bc4ab
ReportingServicesService!library!4!12/20/2010-14:52:03:: Schedule fc2dd7c4-ae29-4e20-a24f-e6d7ee04686d execution completed at 12/20/2010 2:52:03 PM.
ReportingServicesService!dbpolling!4!12/20/2010-14:52:03:: EventPolling finished processing item 3c45f091-aab6-4354-bd1e-e5a8a8103391
ReportingServicesService!dbpolling!4!12/20/2010-14:52:03:: EventPolling processing item 63c3c8af-b3e5-4822-bb17-73f5f1b9fecc
ReportingServicesService!dbpolling!c!12/20/2010-14:52:03:: EventPolling processing 1 more items. 1 Total items in internal queue.
ReportingServicesService!dbpolling!4!12/20/2010-14:52:03:: EventPolling finished processing item 63c3c8af-b3e5-4822-bb17-73f5f1b9fecc
ReportingServicesService!library!d!12/20/2010-14:52:33:: e ERROR: Error processing data driven subscription: System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.
The statement has been terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
   at Microsoft.ReportingServices.DataExtensions.SqlCommandWrapperExtension.ExecuteReader(CommandBehavior behavior)
   at Microsoft.ReportingServices.Library.DataDrivenSubscriptionHandler.DataDrivenSubscriptionWorker(Object o)

我尝试使用本地管理员帐户（也是sa）创建一个新的数据源，但我仍然得到超时。这份报告没什么特别的。它实际上只是带有少量数据的格式化文本。我正在使用SSRS处理发送格式化的电子邮件。我唯一担心的是运行SSRS的机器只有2.0 GB内存。这会导致超时吗？但是，为什么当我为一个用户执行报告时，它很好，但是对于2个用户来说它会变成kablooey？