SQL> startup mount
ORACLE instance started.

Total System Global Area  838860800 bytes
Fixed Size                  1222192 bytes
Variable Size             385878480 bytes
Database Buffers          444596224 bytes
Redo Buffers                7163904 bytes
Database mounted.
SQL> archive log list
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     30
Current log sequence           32
SQL> alter database archivelog;
alter database archivelog
ERROR at line 1:
ORA-00265: instance recovery required, cannot set ARCHIVELOG mode          错误

[oracle@aa ~]$ oerr ora 265
00265, 00000, "instance recovery required, cannot set ARCHIVELOG mode"
// *Cause:  The database either crashed or was shutdown with the ABORT
//          option. Media recovery cannot be enabled because the online
//          logs may not be sufficient to recover the current datafiles.
// *Action: Open the database and then enter the SHUTDOWN command with the
//          NORMAL or IMMEDIATE option.


SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /archive/
Oldest online log sequence     37
Next log sequence to archive   39
Current log sequence           39
SQL> alter database noarchivelog;
alter database noarchivelog
ERROR at line 1:
ORA-01126: database must be mounted in this instance and not open in any

ORA-19625: error identifying file /archive/1_20_755794627.dbf



[oracle@cc ~]$ sqlplus / as sysdba

SQL*Plus: Release - Production on Mon Jul 11 20:10:36 2011

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.

Connected to an idle instance.

SQL> startup nomount
ORA-01261: Parameter db_recovery_file_dest destination string cannot be translated
ORA-01262: Stat failed on a file destination directory
Linux Error: 2: No such file or directory
建立目录  db_recovery_file_dest   参数文件里写了,所以要建立。