Which two Data Guard features require the use of flashback database by the broker? (Choose two.)

• A. Read-Mostly physical standby implementations
• B. Snapshot Standby databases
• C. Real Time Query
• D. Fast-Start Failover
• E. Far Sync Instances

Examine the Data Guard configuration:
DGMGRL> show configuration verbose;
Configuration - Animals
Protection Mode: MaxPerformance
Databases:
cats - Primary database
dogs - (*) Physical standby database
sheep - Physical standby database
(*) Fast-Start Failover target
Properties:
FastStartFailoverThreshold = '30'
OperationTimeout = '30'
TraceLevel = 'USER'
FastStartFailoverLagLimit = '30'
CommunicationTimeout= '180'
ObserverReconnect= '10'
FastStartFailoverAutoReinstate= 'FALSE'
FastStartFailoverPmyShutdown= 'TRUE'
BystandersFollowRoleChange= 'none'
ObserverOverride = 'FALSE'
Fast-Start Failover: ENABLED
Threshold: 30 seconds
Target: dogs
Observer: ol5.example.com
Lag Limit: 30 seconds
Shutdown Primary:TRUE
Auto-reinstate: FALSE
Observer Reconnect: 10 seconds
Observer Override: TRUE
Configuration Status:
SUCCESS
Which two are true? (Choose two.)

• A. The former primary database will not be reinstated automatically after a failover.
• B. The observer will detect if the primary database is unable to accept new connections.
• C. The observer will reinstate Sheep automatically after a failover, if required.
• D. The observer will mark another standby database as the failover target if the original failover target becomes unavailable.
• E. The observer must run on host ol5.example.com and is currently not running.

You administer a Data Guard environment with a primary and two physical standby databases.
One of the physical standby databases is used for reporting and is on the same host as the primary database.
The other physical standby database is remote, used for disaster recovery and REDO is routed to it via a far sync instance.
Backups are offloaded to the remote physical standby.
Which three are true concerning the management of archive logs in this Data Guard configuration? (Choose three.)

• A. Archive logs on the primary database may be deleted once they are shipped on all standby databases.
• B. The deletion policy for archive logs on the remote physical standby should be set so that archived logs are deleted once they backed up at least once on the remote physical standby database.
• C. Archive logs on the primary database may be deleted once they are archived locally to disk.
• D. Archive logs on the primary database may be deleted once they are applied on all standby databases.
• E. The deletion policy for archive logs on the remote physical standby should be set so that archived logs are deleted once they are applied on all standby databases.

Your Data Guard environment consists of these components and settings:
1. A primary database
2. A remote physical standby database
3. Real-time query is enabled.
4. The redo transport mode is set to SYNC.
5. The protection mode is set to Maximum Availability.
You notice that queries executed on the physical standby database receive errors:
ORA- 03172: STANDBY_MAX_DATA_DELAY of 15 seconds exceeded.
Which two would you recommend to avoid this error? (Choose two.)

• A. Increase the network bandwidth between the primary and standby databases.
• B. Increase the number of standby redo log files on the primary database.
• C. Increase the size of the buffer cache on the standby database instance.
• D. Reduce I/O latency for the storage used by the primary database.
• E. Change the protection mode to Maximum Performance.
• F. Change the protection mode to Maximum Protection.

Attempting to start the observer raises an error:
DGMGRL> start observer;
DGM-16954: Unable to open and lock the Observer configuration file Failed.
Identify two possible reasons for this error. (Choose two.)

• A. There is another observer running for a Data Guard configuration which uses the same observer configuration file.
• B. The broker configuration has not yet been created.
• C. The observer configuration file is marked read-only.
• D. Fast-Start Failover is not yet enabled for this Data Guard configuration.
• E. There is already an observer running for this Data Guard configuration.