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

 When you were trying to start the Oracle database, you had the following on your screen.

SQL> STARTUP

ORACLE instance started.

Total System Global Area 6442450944 bytes

Fixed Size                  2938792 bytes

Variable Size            1224738904 bytes

Database Buffers         5200936960 bytes

Redo Buffers               13836288 bytes

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

Process ID: 13761

Session ID: 237 Serial number: 2961

To fix this problem, first check if it was due to no free memory available for the database. Run the command free -g as the root user.

[root@testMachine]# free -g

              total        used        free      shared  buff/cache   available

Mem:              3           0           2           0           0           2

Swap:             3           3           0

If it is necessary, remove some of the old log files in the directory of  $ORACLE_BASE/diag.

Reboot the linux machine to release the memory occupied by processes.

Restart the database.

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