Error:  ORA 3113
Text:   end-of-file on communication channel
-------------------------------------------------------------------------------
Cause:  An unexpected end-of-file was processed on the communication channel.
        The problem could not be handled by the SQL*Net, two task, software.
        This message could occur if the shadow two-task process associated with
        a SQL*Net connect has terminated abnormally, or if there is a physical
        failure of the interprocess communication vehicle, that is, the
        network or server machine went down.

Action: If this message occurs during a connection attempt, check the setup
        files for the appropriate SQL*net driver and confirm SQL*Net software
        is correctly installed on the server. If the message occurs after a
        connection is well established, and the error is not due to a physical
        failure, check if a trace file was generated on the server at failure
        time. Existence of a trace file may suggest an Oracle internal error
        that requires the assistance of customer support.

*** Important: The notes below are for experienced users - See Note:22080.1


Explanation:
        There are numerous causes of this error. It is a 'catch all' type
        error which means 'I cannot communicate with the oracle shadow process'.
        This usually occurs when the Oracle server process has died for
        some reason.

Diagnosis:
        Oracle support need more information to determine what caused the
        error. The most useful items are:

        1) Does this occur when trying to (a) make a connection to the
           database or (b) on an established connection ?

        2) There should be a trace file from the failed session in
           USER_DUMP_DEST

        3) Does a particular statement reproduce this problem or is it
           random ? Use SQL_TRACE on the session to find the problem
           statement.

Articles:
        ORA-3113 on Unix - What Information to Collect       Note:17613.1

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