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ORA-3113: end-of-file on communication channel tips

Oracle Error Tips by Stephanie F.


The Oracle docs note this on the ora-3113 error:

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.

Internet sources contain important information regarding ORA-3113, noted for "experienced users":

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.

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

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



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