Hello!

For SCOM 2012 R2 UR+ if following error is logged every few minutes in the Operations Manager event log:

OpsMgr Management Configuration Service failed to execute 'SnapshotSynchronization' engine work item due to the following exception

Microsoft.EnterpriseManagement.ManagementConfiguration.DataAccessLayer.DataAccessException: Data access operation failed
   at Microsoft.EnterpriseManagement.ManagementConfiguration.DataAccessLayer.DataAccessOperation.ExecuteSynchronously(Int32 timeoutSeconds, WaitHandle stopWaitHandle)
   at Microsoft.EnterpriseManagement.ManagementConfiguration.CmdbOperations.CmdbDataProvider.GetConfigurationSnapshotNextBatch(SnapshotProcessWatermark watermark)
   at Microsoft.EnterpriseManagement.ManagementConfiguration.Engine.TracingConfigurationDataProvider.GetConfigurationSnapshotNextBatch(SnapshotProcessWatermark watermark)
   at Microsoft.EnterpriseManagement.ManagementConfiguration.Engine.SnapshotSynchronizationWorkItem.TransferData(SnapshotProcessWatermark initialWatermark)
   at Microsoft.EnterpriseManagement.ManagementConfiguration.Engine.SnapshotSynchronizationWorkItem.ExecuteSharedWorkItem()
   at Microsoft.EnterpriseManagement.ManagementConfiguration.Interop.SharedWorkItem.ExecuteWorkItem()
   at Microsoft.EnterpriseManagement.ManagementConfiguration.Interop.ConfigServiceEngineWorkItem.Execute()
-----------------------------------
System.Data.SqlClient.SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception (0x80004005): The wait operation timed out
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.SqlCommand.InternalEndExecuteReader(IAsyncResult asyncResult, String endMethod)
   at System.Data.SqlClient.SqlCommand.EndExecuteReaderInternal(IAsyncResult asyncResult)
   at System.Data.SqlClient.SqlCommand.EndExecuteReader(IAsyncResult asyncResult)
   at Microsoft.EnterpriseManagement.ManagementConfiguration.DataAccessLayer.ReaderSqlCommandOperation.SqlCommandCompleted(IAsyncResult asyncResult)
ClientConnectionId:a8844e1f-654f-4dfe-9854-d3852ab7da66

looks like the the SQL Command EndExecuteReader gets a timeout after 30 seconds(which is the default timeout for synchronous calls).. despite it being an async call- which is wrong. So to overcome this there are 2 options:

1. since it`s .NET related, update to .NET 4.5.1+

2. install SCOM 2012 R2 UR3 upgrade, where they configured a special registry key for it. The default timeout, as per normal sql commands is 30 seconds. You can raise it from here HKLM\Software\Microsoft\Microsoft Operations Manager\3.0\Config Service

->New DWORD CommandTimeoutSeconds

30 seconds = 108

50 seconds = 180