下面设置主节点数据库为force logging模式：
SQL> alter database force logging;
Database altered.
force logging存在的意义：使得Oracle无论什么操作都进行redo的写入。
通过select语句可以查看：
SQL> select FORCE_LOGGING from v$database;
FOR
---
YES
因为刚建立数据库，还没有生成归档日志，我们可以手工进行日志切换来让数据库产生日志文件：
SQL> alter system switch logfile;
System altered.
SQL> alter system switch logfile;
System altered.
SQL> alter system switch logfile;
System altered.
SQL> select name from v$archived_log;
NAME
--------------------------------------------------------------------------------
/arch/1_2_697298091.dbf
/arch/1_3_697298091.dbf
/arch/1_4_697298091.dbf
查看已有的日志文件：
SQL> select * from v$logfile;
rows will be truncated
GROUP# STATUS TYPE MEMBER
---------- ------- ------- --------------------------------------------------------
3 ONLINE /home/db/oracle/oradata/ora/redo03.log
2 ONLINE /home/db/oracle/oradata/ora/redo02.log
1 ONLINE /home/db/oracle/oradata/ora/redo01.log
为备节点创建同样大小的三组日志文件并检验：
SQL> alter database add standby logfile group 4 ('/home/db/oracle/oradata/ora/redo04.log') size 50m;
Database altered.
SQL> alter database add standby logfile group 5 ('/home/db/oracle/oradata/ora/redo05.log') size 50m;
Database altered.
SQL> alter database add standby logfile group 6 ('/home/db/oracle/oradata/ora/redo06.log') size 50m;
Database altered.
SQL> select * from v$logfile;
rows will be truncated
GROUP# STATUS TYPE MEMBER
---------- ------- ------- --------------------------------------------------------
3 ONLINE /home/db/oracle/oradata/ora/redo03.log
2 ONLINE /home/db/oracle/oradata/ora/redo02.log
1 ONLINE /home/db/oracle/oradata/ora/redo01.log
5 STANDBY /home/db/oracle/oradata/ora/redo05.log
4 STANDBY /home/db/oracle/oradata/ora/redo04.log
6 STANDBY /home/db/oracle/oradata/ora/redo06.log
6 rows selected.
关闭数据库，即将来到第一个重要步骤，修改服务器参数文件。
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
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