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Oracle Database 19c: Data Guard Administration Sample Questions (Q77-Q82):

NEW QUESTION # 77
Your Data Guard environment contains a primary database and three standby databases with these attributes:
1. prod : Primary database
2. prod_prq : Physical standby database with real-time query enabled used by reporting applications
3. prod_lsby: Logical standby database used by DSS
4. PROD_SSBY: Snapshot standby database used for Real Application Testing Which TWO can be used to prevent clients from connecting to the wrong database instance?

A. Create database services on each of the standby databases, start the services, and add connection descriptors on the clients to connect to those services.
B. Establish Oracle Net connectivity to the primary database instance from all the standby database instances.
C. Create database services for each database and use event triggers to make sure that services are activated only when the database is in the correct role.
D. Create a static service for each of the databases, register it with the local listener of each database instance, and add connection descriptors on clients to connect to those services.
E. Create role based services with the si vet] utility when using clusterware for Oracle RAC databases or Oracle Restart for single instance Oracle databases.

Answer: A,C

Explanation:
Creating dedicated database services for each database instance (Option D) and utilizing event triggers to manage these services based on the role of the database (Option E) ensure that clients connect to the appropriate database instance based on its current role and state. This approach leverages the flexibility and control provided by Oracle Net services and database event management to direct client connections to the suitable primary or standby instance, enhancing the overall robustness and reliability of the Data Guard environment. Reference: Based on Oracle Database 19c best practices for managing connectivity and services in a Data Guard setup, including the use of role-based services and event-driven service management.

NEW QUESTION # 78
Which two are true about managing and monitoring Oracle container databases in a Data Guard environment using the broker?

A. If the primary database is a container database, then a physical standby may be a non-container database.
B. If the primary database is a container database, then a logical standby may be a non-container database.
C. All broker actions execute at the root container for container databases.
D. After a role change, the broker opens all Pluggable databases (pdbb) on the new primary.
E. If the primary database is not a container database, then a standby may be a container database.

Answer: C,D

Explanation:
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.References:
* Oracle Data Guard Broker documentation
* Oracle Multitenant Administrator's Guide

NEW QUESTION # 79
Which three are prerequisites for enabling Fast-Start Failover?

A. A static service name must be configured only for the Fast-Start Failover target standby database.
B. The Fast-Start Failover target standby database must receive REDO synchronously when the configuration operates in Maximum Availability mode.
C. Flashback Database must be enabled on the Fast-Start Failover target standby database.
D. The Fast-Start Failover target standby database may receive REDO either synchronously or asynchronously when the configuration operates in Maximum Performance mode.
E. Flashback Database must be enabled on the primary database.

Answer: B,C,E

NEW QUESTION # 80
Which THREE statements are true........ open in real time query mode, which becomes a new.

A. Sessions that have long running queries can be retained.
B. Sessions that are using database links
C. User sessions and Current Buffers are maintained by default.
D. All sessions are disconnected and all
E. User sessions can be retained.
F. All current buffers can be retained.

Answer: D,E,F

Explanation:
When a physical standby database is opened in real-time query mode, which may be referred to as real-time apply when using Active Data Guard, certain operations can disrupt ongoing sessions. However, with features like Application Continuity and the proper configuration of initialization parameters such as STANDBY_DB_PRESERVE_STATES, user sessions and current buffers may be preserved during role transitions such as a switchover or failover. Specifically, the STANDBY_DB_PRESERVE_STATES parameter can be set to preserve none, all, or only user sessions during such transitions. This ensures that in-flight transactions are not lost and that users do not experience disruptions during the role transitions of a physical standby database.
References
* Oracle Data Guard Concepts and Administration
* Oracle Database Licensing Information User Manual
* Oracle Data Guard Broker User Manual

NEW QUESTION # 81
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?

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

Answer: A,E

Explanation:
The ORA-03172: STANDBY_MAX_DATA_DELAY error indicates that the real-time query on the physical standby database is experiencing delays beyond the specified maximum data delay threshold. Increasing the network bandwidth (Option E) can enhance the speed at which redo data is transferred from the primary to the standby database, thereby reducing the likelihood of exceeding the STANDBY_MAX_DATA_DELAY threshold. Reducing I/O latency on the primary database's storage (Option B) ensures that redo data is generated and shipped more efficiently, further mitigating the risk of delay. These actions, focused on optimizing data transfer and processing speed, address the root causes of the ORA-03172 error in a synchronous Data Guard configuration operating in Maximum Availability mode.

NEW QUESTION # 82
......

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