ORA-03113: end-of-file on communication channel

     This error means that your connection has died. For some reason, your client machine and the database server have stopped talking to each other. 

     That reason could be one of a rather long list: has your server crashed? has someone pulled out your network cable? was your process killed at the O/S level? is your Windows log full? or maybe there is an Oracle internal error?

     My advice is this: do not overlook the obvious. This error is sometimes caused by the simplest of things. If, however, it is caused by an Oracle internal error, look to your alert log for further information.
     
ORA-03113: end-of-file on communication channel

Cause: The connection between Client and Server process was broken. It may also happen if the external agent extproc crashes for some reason.

Action: There was a communication error that requires further investigation. First, check for network problems and review the SQL*Net setup. Also, look in the alert.log file for any errors. Finally, test to see whether the server process is dead and whether a trace file was generated at failure time. There may be some system calls in the .NET function which might terminate the process. Remove such calls.