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Examine this list of possible steps: 1. Raise the compatibility level on both databases. 2. Restart SQL Apply on the upgraded logical standby database. 3. Start SQL Apply on the old primary database. 4. Perform a Switchover to the logical standby database. 5. Upgrade the logical standby database. 6. Upgrade the old primary database. Which is the minimum number of steps in the correct order, to perform a rolling release upgrade of a data guard environment using an existing logical standby database and to enable the new functionality?
Correct Answer: A
The process of performing a rolling release upgrade in a Data Guard environment using a logical standby database generally involves these steps: Raise the compatibility level on both databases (1): Ensuring both the primary and logical standby databases are operating with the same and correct compatibility level is essential before starting the upgrade process. Upgrade the logical standby database (5): Apply the database upgrade to the logical standby first, which allows the primary database to continue serving the workload without interruption. Restart SQL Apply on the upgraded logical standby database (2): Once the logical standby has been upgraded, SQL Apply must be restarted to apply the redo data from the primary database, which is still running the earlier version. Perform a switchover to the logical standby database (4): After confirming that the logical standby database is successfully applying redo data, perform a switchover to make it the new primary database. Upgrade the old primary database (6): With the new primary database now in place, upgrade the old primary database (which is now the new standby) to the new Oracle Database release. Start SQL Apply on the old primary database (3): Finally, start SQL Apply on what is now the standby database to synchronize it with the new primary database. Reference: Oracle Data Guard Concepts and Administration Guide Oracle Database Upgrade Guide
