体验一下Oracle 11g物理Active Data Guard实时查询（Real-time query）

以下为【高可用】 课后一则实验日志：

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体验一下Oracle 11g物理Active Data Guard实时查询（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

#查看当前数据库状态

SQL> select open_mode from v$database;

OPEN_MODE

------------------------------------------------------------

MOUNTED

# 取消备库的自动恢复

SQL> alter database recover managed standby database cancel;

Database altered.

#OPEN备库调整为“READ ONLY”状态

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

后面在主库中插入数据并提交

SQL> insert into test values(20);

1 row created.

SQL> commit;

同时可以看到备库的alertDB2.log 日志文件即刻有反应，日志立马同步过来，并可以在

查询表TEST看到数据已同步过来了。

SQL> select count(0) from test;

SQL> select count(0) from test;

COUNT(0)

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20