How to solve the problem that the Oracle instance cannot be started

SQL> startup
ORACLE instance started.

Total System Global Area 1653518336 bytes
Fixed Size            2228904 bytes
Variable Size         1207962968 bytes
Database Buffers      436207616 bytes
Redo Buffers            7118848 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 6428
Session ID: 125 Serial number: 5
The above problems occur when starting the database

This problem may occur because the database is forced to shut down abnormally , This may lead to inconsistent file status , Because closing the database normally will synchronize and verify all files , Make the file time consistent when restarting .

resolvent ：
1. Start database to mount state
SQL>conn / as sysdba
SQL> startup mount

 

 2. see v$log Reset the log again
SQL> select * from v$log;
SQL> alter database open resetlogs 2;

3. Recover database logs
SQL> alter database open resetlogs;
SQL> recover database until time '2022-07-20'  （ Recover to the point of failure ）
SQL> alter database open resetlogs;