以下為【高可用】 課后一則實驗日志：

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體驗一下Oracle 11g物理Active Data Guard實時查詢（Real-time query）特性

[oracle@dg1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 6 17:08:28 2013

Copyright (c) 1982, 2009, Oracle.? All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

#查看當前數據庫狀態
SQL> select open_mode from v$database;

OPEN_MODE
------------------------------------------------------------
MOUNTED

# 取消備庫的自動恢復
SQL> alter database recover managed standby database cancel;

Database altered.

#OPEN備庫調整為“READ ONLY”狀態
SQL> alter database open;

Database altered.


SQL> select open_mode from v$database;

OPEN_MODE
--------------------
READ ONLY

SQL> alter database recover managed standby database using current logfile disconnect;

Database altered.

SQL> select open_mode from v$database;

OPEN_MODE
------------------------------------------------------------
READ ONLY WITH APPLY

后面在主庫中插入數據并提交

SQL> insert into test values(20);

1 row created.

SQL> commit;

同時可以看到備庫的alertDB2.log 日志文件即刻有反應，日志立馬同步過來，并可以在
查詢表TEST看到數據已同步過來了。

SQL> select count(0) from test;

SQL> select count(0) from test;

? COUNT(0)
----------
?? ?20

總結

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