Time for action – switchover with a physical standby using broker

  1. If the primary database is RAC and you perform switchover with the broker, it will shut down all the remaining instances except one; and if there are any issues in terminating the instances, the switchover will exit without success. So ensure that all the primary instances are down except the one.
  2. Even though the broker will verify the state of the both the primary and standby databases, it's recommended to check the database state manually as follows:
    DGMGRL> show configuration;
Configuration - PACKT
  Protection Mode: MaxPerformance
  Databases:
    turkey_un - Primary database
    INDIA_UN  - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
  3. Now connect to the DGMGRL and issue the command as shown in the following screenshot:
    Time for action – switchover with a physical standby using broker

    Tip

    When performing a switchover, connect the database to the DGMGRL using a complete password such as connect sys/******, because DGMGRL doesn't support OS authentication.

  4. After performing the switchover, the broker configuration file is updated regarding the role transition.
    2012-10-11 13:08:31.463 02001000  1799321493 DMON: Switchover - updated Seq.MIV to 1.0 (2.1.1799321493), writing metadata to "/u01/home/oracle/product/11.2.0/db_1/dbs/dr2INDIA_UN.dat"
2012-10-11 13:08:31.477 02001000  1799321493 DMON: posting primary instances for SWITCHOVER phase 3
  5. After updating the configuration file, the broker configuration restarts the new primary database in read-write mode and the new standby database will be terminated and restarted with the previous configuration; that is, the Read Only With Apply mode.
  6. Now, after performing the switchover, check the configuration status using DGMGRL as follows:
    DGMGRL> show configuration;
Configuration - PACKT
  Protection Mode: MaxPerformance
  Databases:
    INDIA_UN  - Primary database
    turkey_un - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS

What just happened?

We have discussed how to perform switchover from the primary database to the standby database and vice versa using SQL*Plus and also the Data Guard broker utility DGMGRL.

Performing switchover with a physical standby database using EM Cloud Control

As discussed at the beginning of this chapter, we can use the Enterprise Manager Cloud Control Data Guard administration interface to perform the switchover operation. This is an easy but less controlled way of performing a switchover. Let's see how we use Cloud Control in this context.

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