A query on the view DBA_LOGSTBY_UNSUPPORTED on your primary database returns no rows.
As a result of this, you decide that an upgrade may use logical standby databases.
Which two are true about upgrading Data Guard environments consisting of one logical standby database running on a separate host from the primary? (Choose two.)

• A. Fast-Start Failover can be used to protect the primary database during the upgrade.
• B. Using manual upgrade, catupgrd.sql needs to run on the primary database only.
• C. The upgrade always requires downtown until the upgrade of the logical standby is completed.
• D. SQL Apply on the local standby database must be stopped while the primary database is upgraded.
• E. Using manual upgrade, catctl.pl can be executed in some cases on the primary and standby database simultaneously.
• F. The upgrade always required downtime until the upgrade of the primary is completed.

Examine this command executed on a physical standby database to transition it to a logical standby database:
SQL> ALTER DATABASE RECOVER TO LOGICAL STANDBY prodlgsby;
Which statement is true regarding the execution of this command?

• A. Supplemental logging will be enabled on the logical standby database when the physical database is transitioned to the logical standby database.
• B. It will automatically start redo apply.
• C. The Managed Recovery Process (MRPO) continues applying redo up to the SCN immediately preceding the redo corresponding to the LogMiner dictionary build.
• D. SQL apply is automatically started when transitioning to the logical standby database.
• E. FLASHBACK is automatically enabled when transitioning to the logical standby database.

Your Data Guard environment has one physical standby database using Real-Time Query.
Two sequences have been created by these SQL statements:
create sequence a global;
create sequence b session;
Neither sequence has been used since being created.
Session 1 connects to the primary database instance and issues these two SQL statements:
SELECT a.nextval FROM DUAL;
SELECT b.nextval FROM DUAL;
Then session 2 connects to the physical standby database instance and issues the same SQL statements.
What output will be seen for session 2?

• A. Option C
• B. Option D
• C. Option B
• D. Option A

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