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The RECOVER STANDBY DATABASE FROM SERVICE command in RMAN is designed to automate various steps required to recover the standby database, especially when dealing with an archive gap. When this command is executed, the following actions can occur automatically:
Remember all data file names on the standby (1): RMAN has the capability to recall the names and paths of all data files associated with the standby database.
Restart standby in nomount (2): The standby database can be automatically restarted in the NOMOUNT state, allowing recovery operations to proceed without the database being open.
Restore controlfile from primary (3): RMAN can restore the control file from the primary database to the standby system, ensuring that the standby has the most up-to-date control file.
Mount standby database (4): After restoring the control file, the standby database is mounted to prepare for data file recovery.
Rename data files from stored standby names (5): Not typically done automatically by this command.
Restore new data files to new names (6): New data files added to the primary since the last synchronization can be restored to the standby with their correct names.
Recover standby (7): Finally, RMAN will apply any necessary redo logs to bring the standby database up to date with the primary.
While some steps, such as renaming data files (5), typically require manual intervention or scripting, most of the recovery process can be handled by RMAN automatically, streamlining the recovery of the standby database.
Oracle Database Backup and Recovery User's Guide
Oracle Data Guard Concepts and Administration Guide
Question No. 3
You must propose an Oracle Data Guard configuration for a database supporting an OLTP workload that meets these permanent requirements:
Data loss is not permitted.
Read-only applications should not connect to the primary database instance.
Additionally, there are these requirements, only one of which is ever done at any one time:
It should be possible to apply and test designated patches with a minimum amount of downtime.
Upgrading to a new database release should be performed with the least possible amount of downtime.
New application software releases should be tested against an exact up-to-date replica of the production database.
You propose a primary database with one physical standby database configured in Maximum Protection mode.
In the context of Oracle Data Guard and container databases (CDBs) managed by Data Guard Broker:
All broker actions execute at the root container for container databases (D): When using Data Guard Broker to manage a CDB, the actions performed by the broker are executed at the level of the root container. This is because the root container maintains the control and configuration information that applies to the entire CDB, including all of its pluggable databases (PDBs).
After a role change, the broker opens all Pluggable databases (PDBs) on the new primary (E): Following a role transition such as a switchover or a failover, Data Guard Broker ensures that all PDBs within the CDB of the new primary database are opened, which is essential to resume operations of the PDBs without manual intervention.
Reference:
Oracle Data Guard Broker documentation
Oracle Multitenant Administrator's Guide
Question No. 5
Active Data Guard (ADG) databases are widely used to offload reporting or ad hoc query-only jobs from the primary database. Reporting workload profile is different from the primary database and often requires tuning.
Which tool is used to tune SQL workloads running on an ADG database?
AWR collects, processes, and maintains performance statistics for problem detection and self-tuning purposes. In an Active Data Guard environment, where the physical standby database can be used for read-only workloads, AWR can be instrumental in identifying performance bottlenecks and areas for optimization. It provides detailed reports that include wait events, time model statistics, and active session history, making it an invaluable tool for tuning SQL queries and overall database performance in an ADG setup.
