－，查看Oracle归档模式
SQL> conn evan/evan  (dba)
Connected.
SQL> archive log list
ORA-01031: insufficient privileges

SQL> conn / as sysdba --archive log list需要以sysdba执行
Connected.
SQL> archive log list
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     2
Current log sequence           4
查询v$database
SQL> select name,log_mode from v$database;

NAME      LOG_MODE
--------- ------------
ORALIFE   NOARCHIVELOG

二，修改归档模式
归档日志位置,Oracle 10g可以生成多份一样的日志，保存多个位置，以防不测
SQL> alter system set log_archive_dest_1='location=/oracle/10g/oracle/log/archive_log';

System altered.

SQL> alter system set log_archive_dest_2='location=/oracle/10g/oracle/log/archive_log2';

System altered.

SQL> shutdown immediate
ORA-01031: insufficient privileges
SQL> conn / as sysdba
Connected.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  528482304 bytes
Fixed Size                  1220360 bytes
Variable Size             163578104 bytes
Database Buffers          356515840 bytes
Redo Buffers                7168000 bytes
Database mounted.
SQL> alter database archivelog; －－设置归档模式

Database altered.

SQL> alter database open;

Database altered.

配置归档文件格式(从oracle 10g 开始，必须带有%s,%t,%r)
SQL> alter system set log_archive_format="archive_%t_%s_%r.arclog" scope=spfile;

System altered.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area  528482304 bytes
Fixed Size                  1220360 bytes
Variable Size             163578104 bytes
Database Buffers          356515840 bytes
Redo Buffers                7168000 bytes
Database mounted.
SQL> archive log list  －－查看是否归档
Database log mode              Archive Mode
Automatic archival             Enabled          －－已开启自动归档
Archive destination            /oracle/10g/oracle/log/archive_log2
Oldest online log sequence     2
Next log sequence to archive   4
Current log sequence           4

SQL> select destination from v$archive_dest;  －－查看归档日志位置

DESTINATION
--------------------------------------------------------------------------------
/oracle/10g/oracle/log/archive_log
/oracle/10g/oracle/log/archive_log2

10 rows selected.

还可以配置归档进程个数
alter system set log_archive_max_processes=n