Database driver error Below possible reasons The error, Informatica doesn't use the same database connection by default as you used to define the source. Make the connection type ODBC (do not use Microsoft SQL Server). ERROR 12/6/2012 5:12:26 PM node01_infaserver READER_1_1_1 RR_4036 Error connecting . Ensure that the source database supports the SQL query or the SQL query override that you entered. Hi, I think you need to check the database connection that listener service is working properly and resolve the connection string, Also you can check when workflow is running then there is some thing to block the network service. Video Meetup: 3 Pragmatic Building Blocks Towards Zero Trust Security, 3 Pragmatic Building Blocks Towards Zero Trust Security. You cannot have more than one Info Hierarchy coming into an Application SQ. In the function the parameter is specified as source field type with value