I am running umbraco v 4.7.1 on a very large database, over 305,000 nodes. I cannot open any documents in the Content section. Everything just times out.

Here is the stack trace:

[SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +404
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +412
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1363
   System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +59
   System.Data.SqlClient.SqlDataReader.get_MetaData() +118
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +6387873
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +6389442
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +538
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +28
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +256
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior) +228
   Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) +262
   umbraco.DataLayer.SqlHelpers.SqlServer.SqlServerHelper.ExecuteReader(String commandText, SqlParameter[] parameters) +26
   umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) +148

[SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteReader]
   umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) +261
   umbraco.cms.businesslogic.web.Document..ctor(Boolean optimizedMode, Int32 id) +456
   umbraco.cms.presentation.editContent.OnInit(EventArgs e) +304
   System.Web.UI.Control.InitRecursive(Control namingContainer) +133
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1970