-- 查看当前的归档模式
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination D:oracleora92RDBMS
Oldest online log sequence 0
Current log sequence 1

SQL> show parameter log_archive_start

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_start boolean FALSE

-- 第一步、修改log_archive_start参数

SQL> alter system set log_archive_start=true scope=spfile;

System altered.

-- 因为是修改参数文件，所以不会马上生效

SQL> show parameter log_archive_start

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_start boolean FALSE

-- 第二步、重新启动数据库
-- 先关闭
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
-- 再以挂载方式启动
SQL> startup mount
ORACLE instance started.

Total System Global Area 135338868 bytes
Fixed Size 453492 bytes
Variable Size 109051904 bytes
Database Buffers 25165824 bytes
Redo Buffers 667648 bytes
Database mounted.

-- 第三步、改变数据库归档模式

SQL> alter database archivelog;

Database altered.

SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination D:oracleora92RDBMS
Oldest online log sequence 0
Next log sequence to archive 1
Current log sequence 1

-- 最后，重新打开数据库
SQL> alter database open;

Database altered.

--=========== 下面是反操作 ============--

SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination D:oracleora92RDBMS
Oldest online log sequence 0
Next log sequence to archive 1
Current log sequence 1

SQL> alter system set log_archive_start=false 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 135338868 bytes
Fixed Size 453492 bytes
Variable Size 109051904 bytes
Database Buffers 25165824 bytes
Redo Buffers 667648 bytes
Database mounted.

SQL> archive log list
Database log mode Archive Mode
Automatic archival Disabled
Archive destination D:oracleora92RDBMS
Oldest online log sequence 0
Next log sequence to archive 1
Current log sequence 1

SQL> alter database noarchivelog;

Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination D:oracleora92RDBMS
Oldest online log sequence 0
Current log sequence 1