Oracle 11g Data Guard Enabling Active Data Guard
Oracle 11g Data Guard Enabling Active Data Guard
開啟ADG需要standby database instance redo-only mode and starting redo logfiles
The general process of enabling Active Data Guard is as simple as opening the
standby database in read-only mode and starting Redo Apply.
This section describes how to enable Active Data Guard on a standby database.
1. If the standby instance and redo apply have been cleanly shut down
a. Using SQL*PlusMaximum Availability Architecture
Oracle Active Data Guard: Oracle Data Guard 11g Page 9
i. Start the standby instance in read-only mode.
SQL> startup
ii. Once the database is open, start Redo Apply:
SQL> recover managed standby database disconnect
using current logfile;
b. If you are using the Data Guard broker to manage your Data
Guard configuration
i. Start the standby instance in read-only mode. Connect
to the standby instance using DGMGRL and issue the
following command:
DGMGRL> startup
ii. The default state for the standby database is APPLY ON
and Redo Apply starts automatically. If the default has
been changed, then start Redo Apply by issuing the
following command:
DGMGRL> EDIT DATABASE ‘RTQ' SET STATE=‘APPLY-ON’
2. If the standby database is mounted and redo apply is running using the following steps
a. Using SQL*Plus
i. Stop redo apply
SQL> recover managed standby database cancel;
ii. Open the database read only
SQL> alter database open read only;
iii. Once the database is open, start redo apply:
SQL> recover managed standby database disconnect
using current logfile;
b. If you are using the Data Guard broker to manage your Data
Guard configuration
i. Stop redo apply using DGMGRL
DGMGRL> EDIT DATABASE ‘RTQ' SET STATE=‘APPLY-OFF’
ii. In SQL*Plus open the database read only
SQL> alter database open read only;
iii. Restart redo apply by issuing the following command:
DGMGRL> EDIT DATABASE ‘RTQ' SET STATE=‘APPLY-ON’
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