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

Oracle Database Server 12c Here is how to fix ORA-03113: end-of-file on communication channel

Cause: I issued shutdown immediate command in a running database instance. The database was busy and it took ages to shut it down. I was impatient and I did kill a virtual machine server. After virtual machine restart, the database did not start any more, throwing ORA-03113 error.

[[email protected] ~]$ sqlplus / as sysdba
...
...
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 2147483648 bytes
Fixed Size 2926472 bytes
Variable Size 1224738936 bytes
Database Buffers 905969664 bytes
Redo Buffers 13848576 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 4903
Session ID: 237 Serial number: 26032

Solution:

SQL> exit
Disconnected from Oracle Database 12c 
Enterprise Edition Release 12.1.0.2.0 - 64bit Production

[[email protected] ~]$ sqlplus / as sysdba
...
...
Connected to an idle instance.

SQL> startup nomount
ORACLE instance started.

Total System Global Area 2147483648 bytes
Fixed Size 2926472 bytes
Variable Size 1224738936 bytes
Database Buffers 905969664 bytes
Redo Buffers 13848576 bytes
SQL> alter database mount;

Database altered.

SQL> alter database clear unarchived logfile group 1;
Database altered.

SQL> alter database clear unarchived logfile group 2;
Database altered.

SQL> alter database clear unarchived logfile group 3;
Database altered.

SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 2147483648 bytes
Fixed Size 2926472 bytes
Variable Size 1224738936 bytes
Database Buffers 905969664 bytes
Redo Buffers 13848576 bytes
Database mounted.
Database opened.
SQL>

Uff… Database opened!

Cheers!

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