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
______________________________
SQL> alter database mount;
SQL> alter database clear unarchived logfile group 1;
SQL> alter database clear unarchived logfile group 2;
SQL> alter database clear unarchived logfile group 3;
SQL> shutdown immediate
SQL> startup
