在Oracle10g中，只要启动数据库的归档模式，Oracle就会启用自动归档，从而避免了10g以前由于用户疏忽所带来的一系列问题。
$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.1.0.3.0 - ProdUCtion on Wed Apr 13 09:53:25 2005
Copyright (c) 1982, 2004, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - 64bit Production
With the Partitioning and Data Mining options
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 25
Current log sequence 27
SQL> show parameter log_archive_start
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_start boolean FALSE
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 3204448256 bytes
Fixed Size 1304912 bytes
Variable Size 651957936 bytes
Database Buffers 2550136832 bytes
Redo Buffers 1048576 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination
USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 25
Next log sequence to archive 27
Current log sequence 27
SQL>
