文章的前面回把开启归档模式及设置归档日志格式等内容放到前面，便于查阅及理清思路。后面会对每一部都进行详细的描述 SQLgt; a

文章的前面回把开启归档模式及设置归档日志格式等内容放到前面，便于查阅及理清思路。后面会对每一部都进行详细的描述

SQL> archive log list //查看当前归档模式
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 3
Current log sequence 5
开启归档模式

SQL> shutdown immediate
Database closed.
Database dismounted.
Oracle instance shut down.

SQL> startup mount;
ORACLE instance started.

Total System Global Area 612368384 bytes
Fixed Size 2022832 bytes
Variable Size 222298704 bytes
Database Buffers 385875968 bytes
Redo Buffers 2170880 bytes
Database mounted.

SQL> alter database archivelog; //开启归档模式

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 3
Next log sequence to archive 5
Current log sequence 5

修改归档日志存放地

SQL> alter system set db_recovery_file_dest=‘’;

System altered.

SQL> alter system set log_archive_dest=‘/home/oracle/backup’;

System altered.

SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /home/oracle/backup
Oldest online log sequence 3
Next log sequence to archive 5
Current log sequence 5
注：

从oracle10g开始默认情况下，归档日志会存放到快速恢复区所对应的目录（对应于初始化参数db_recovery_file_dest)并且会按照特定的格式生成归档日志文件名，如果我们不修改db_recovery_file_dest=‘'为空，，而直接指定log_archive_dest的路径则会报错。如下：

SQL> alter system set log_archive_dest='/home/oracle/backup';
alter system set log_archive_dest='/home/oracle/backup'
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16018: cannot use LOG_ARCHIVE_DEST with LOG_ARCHIVE_DEST_n or
DB_RECOVERY_FILE_DEST

SQL> alter system set log_archive_format=’ARC%S_%R.%T.arc‘ scope=spfile;

System altered.

SQL> alter system switch logfile; //日志格式的修改仍然没有生效，尝试重启数据库使之生效，生成.arc结尾的文件

System altered.

SQL> alter database open;

Database altered.

SQL> alter system switch logfile; //手工切换，目的是产生归档日志，在backup目录下查看生成的文件

System altered.

cd /home/oracle/backup
$ ls
1_5_7346919.dbf 1_6_7346919.dbf 1_7_7346919.dbf ARC0000000008_07346919.0001.arc