How to resolve ORA-03113: end-of-file on Communication Channel?

Will guide you with our tutorial error ORA-03113 error step by step to find the root cause and fix.

Solved.

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. 

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. 

Recommended : Always to check the Alert log for possible cause.

It Could be many factors/Scenarious the issue we face.

The source of an ORA-03113 is a broken connection between Client and Server process, a blanket end-of-file on a communication channel error. When the error occurs during the process of connecting, it suggests a lost connection that is similar to a timeout. The error could be signaled for a multitude of reasons, such as a server machine crashing, network issues, internal Oracle errors on the server, your server process being ended at the operating-system level, or a Client having issues handling multiple connections. The error also can occur in conjunction with other errors, such as the ORA-01012 (not logged on), ORA-01041 (hostdef extension does not exist), or ORA-03114 (not connected to Oracle). 

Common Situation to face this situation: When we are going to start the Oracle database, i am getting the ORA-03113 error during the startup command. My first step is looking into the alert log file which helps us to find cause of error.

SQL> select * from scott.emp;
select * from scott.emp
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 40208
Session ID: 3 Serial number: 2

or also – while trying to connect

SQL> startup
ORACLE instance started.
Total System Global Area 23584982528 bytes
Fixed Size 2452778 bytes
Variable Size 4531678966 bytes
Database Buffers 2342356778 bytes
Redo Buffers 25876431 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 2588
Session ID: 1705 Serial number: 5

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