Error code – ORA-03113

Solution

ORACLE_SID = orcl
The Oracle base remains unchanged with value /u01/app/oracle
[oratest@oracle ~]$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Wed Sep 8 23:53:19 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area  281017392 bytes
Fixed Size                  8895536 bytes
Variable Size             218103808 bytes
Database Buffers           50331648 bytes
Redo Buffers                3686400 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 4097
Session ID: 390 Serial number: 53661

SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 -
 Production
Version 19.3.0.0.0


[oracle@oracle ~]$ sqlplus / as sysdba

Connected to an idle instance.


SQL> startup nomount
ORACLE instance started.

Total System Global Area  281017392 bytes
Fixed Size                  8895536 bytes
Variable Size             218103808 bytes
Database Buffers           50331648 bytes
Redo Buffers                3686400 bytes

SQL> alter database mount;

Database altered.



SQL> alter database clear unarchived logfile group 2;

Database altered.


SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.

[oratest@oracle ~]$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Thu Sep 9 00:14:39 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area  281017392 bytes
Fixed Size                  8895536 bytes
Variable Size             218103808 bytes
Database Buffers           50331648 bytes
Redo Buffers                3686400 bytes
Database mounted.
Database opened.

SQL> select name,open_mode from v$database;

NAME      OPEN_MODE
--------- --------------------
ORCL      READ WRITE

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