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

Problem

Following Error occur while restart the database after the unclean shutdown

SQL> startup
ORACLE instance started.
Total System Global Area 4943876096 bytes
Fixed Size                  2261688 bytes
Variable Size             989859144 bytes
Database Buffers         3942645760 bytes
Redo Buffers                9109504 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 18379
Session ID: 191 Serial number: 3

Solution

Redo log file might become corrupted while the database is open,Need to clear the corrupted redo logs to open the database.

SQL> startup mount;
ORA-24324: service handle not initialized
ORA-01041: internal error. hostdef extension doesn't exist

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL> sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Wed Dec 11 18:35:04 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup mount;

ORACLE instance started.

Total System Global Area 4943876096 bytes
Fixed Size                  2261688 bytes
Variable Size             989859144 bytes
Database Buffers         3942645760 bytes
Redo Buffers                9109504 bytes
Database mounted.

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 4943876096 bytes
Fixed Size                  2261688 bytes
Variable Size             989859144 bytes
Database Buffers         3942645760 bytes
Redo Buffers                9109504 bytes
Database mounted.
Database opened.