Oracle ORA-03113: end-of-file on communication channelOracle Consulting Tips by Burleson
Question: I am running a distributed query using
a db_link and I get this ORA-03113 error when I run the
ORA-03113: end-of-file on communication
How do I fix this ORA-03113 error?
Answer: Use the
oerr utility to get the details for the ORA-03113 error:
ORA-03113: end-of-file on communication channel
Cause: The connection between Client and Server
process was broken.
Action: There was a communication error that
requires further investigation.
- 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.
The ORA-03113: end-of-file on communication
channel error is a generic error. The ORA-03113 error when
connecting suggests that the connection was established, but lost
later, like a timeout.
Note: Windows users report
ORA-03113 errors from non-Oracle issues like Windows logs becoming
There are many possible causes for the
ORA-03113 error. It is a "catch-all" type error which means "I
cannot communication with the Oracle shadow process." This
usually happens when the Oracle server process has died for some
for more than 800 notes on resolving the ORA-03113 error! For
generic troubleshooting, see MOSC Note 17613.1 titled "ORA-03113"
and Troubleshooting ORA-03113 (MOSC ID 1506805.1)
For example, ORA-03113 could be signaled for
any of these scenarios:
- Your server process was killed at O/S level
- Oracle internal errors / aborts on the server
- Client incorrectly handling multiple connections
- etc.. etc.. etc.. - a lot of possible causes !!
It goes on to note that the ORA-03113 End-Of-File error
often has additional messages:
It is common for this error to be accompanied by other errors such
ORA-01041 internal error. hostdef extension doesn't
Oracle support will likely need more information to determine what
caused the error.
The most useful items are:
- Does this occur when trying to (a) make a connection to
the database or
(b) on an established connection ?
- Check for a trace file from the failed session in
USER_DUMP_DEST and BACKGROUND_DUMP_DEST directories.
- Does a particular statement reproduce this problem or is
it random ? Use SQL_TRACE on the session to find the problem
The "ORA-03113 is
received when running catpatch after applying the 184.108.40.206 or 220.127.116.11
Get the Complete
Oracle SQL Tuning Information
The landmark book
SQL Tuning The Definitive Reference" is
filled with valuable information on Oracle SQL Tuning.
This book includes scripts and tools to hypercharge Oracle 11g
performance and you can
for 30% off directly from the publisher.