启用oracle自动归档模式

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1.创建保存备份的目录
mkdir /u01/oracle/oradata/archive/archive
chown -R oracle /u01/oracle/oradata/archive/archive
2. 切换到oracle用户
sqlplus /nolog
connect /as sysdba
3. 设置归档日志目标地址

查看数据库是否在归档模式

SQL> select log_mode from v$database;

LOG_MODE
------------------------
NOARCHIVELOG

SQL> show parameter 'log_archive_dest_1'

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_1                   string
log_archive_dest_10                  string
log_archive_dest_11                  string
log_archive_dest_12                  string
log_archive_dest_13                  string
log_archive_dest_14                  string
log_archive_dest_15                  string
log_archive_dest_16                  string
log_archive_dest_17                  string
log_archive_dest_18                  string
log_archive_dest_19                  string

SQL> alter system set log_archive_dest_1='location=/u01/oracle/oradata/archive/archive' scope=spfile;

System altered.

SQL> show parameter log_archive_format;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_format string %t_%s_%r.dbf

--设置日志文件名称格式重起数据库后生效
alter system set log_archive_dest_1='location=/u01/oracle/oradata/archive' scope=spfile;

SQL> System altered.

4.关闭数据库
SQL> shutdown immediate;

5. 启动数据库并加载
SQL> startup mount;

6.将数据库切换为归档模式
SQL> alter database archivelog;

SQL> select log_mode from v$database;

LOG_MODE
------------------------
ARCHIVELOG

7.打开数据库
SQL> alter database open;
8. 切换日志，强迫归档

SQL> alter system switch logfile;

9. SQL> select archiver from v$instance;

ARCHIVER
--------------
STARTED

--查看生成的归档文件全路经
SQL> select name from v$archived_log;

NAME
--------------------------------------------------------------------------------
/u01/oracle/oradata/archive/arch_50d8fe87_1_762534602_37.log