SQL> startup
ORACLE instance started.
Total System Global Area 957843432 bytes
Fixed Size 731112 bytes
Variable Size 285212672 bytes
Database Buffers 671088640 bytes
Redo Buffers 811008 bytes
Database mounted.
ORA-16068: redo log file activation identifier mismatch
ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/ora92/redo01.log'
ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/ora92/redo10.log'
ORACLE instance started.
Total System Global Area 957843432 bytes
Fixed Size 731112 bytes
Variable Size 285212672 bytes
Database Buffers 671088640 bytes
Redo Buffers 811008 bytes
Database mounted.
ORA-16068: redo log file activation identifier mismatch
ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/ora92/redo01.log'
ORA-00312: online log 1 thread 1: '/opt/oracle/oradata/ora92/redo10.log'
alter database open resetlogs;
Action Other messages will accompany this message. See the associated messages for the appropriate action to take.