1Z0-997-25 Question 40
Select 2You are designing a mission-critical eCommerce application on Oracle Cloud Infrastructure (OCI) that must remain available even if the primary region experiences a complete outage. The application uses an Oracle Autonomous Transaction Processing database and a fleet of compute instances in private subnets behind a load balancer. You must ensure near-zero data loss and minimal downtime in a disaster scenario. Which two strategies should you implement to meet these requirements?
- A
Enable Oracle Autonomous Data Guard for cross-region replication of the database.
- B
Deploy compute instances across multiple Availability Domains in a single region for disaster recovery.
- C
Use an OCI multi-region load balancer with a failover routing policy that directs traffic to the standby region when the primary region becomes unavailable.
- D
Create weekly block volume backups to a second region for DR purposes.
- E
Use a single region with multiple Fault Domains to serve both primary and standby roles simultaneously.
Show answer and explanation
Correct answers: A, C
Explanation
Designing for high availability and disaster recovery in OCI requires a multi-region approach. Configuring Autonomous Data Guard for cross-region replication provides near-continuous protection of the database, and using a global or multi-region load balancer with failover ensures minimal downtime. Relying on a single region, even with multiple Availability Domains or Fault Domains, does not protect applications from a region-wide event. The recommended best practices can be found in Oracle� documentation under 'Designing Highly Available and Disaster Recovery Solutions' at https://docs.oracle.com/en-us/iaas/.
- A. Correct.
Correct: Oracle Autonomous Data Guard for cross-region replication ensures near-zero data loss by continuously replicating data from the primary database to a standby database in another region. If the primary region fails, you can quickly fail over to the standby with minimal downtime.
- B. Incorrect.
Incorrect: Although multiple Availability Domains in the same region provide high availability within that region, they do not protect against a region-wide outage. You need a second region for true disaster recovery.
- C. Correct.
Correct: Using an OCI multi-region load balancer with a failover routing policy ensures that traffic is automatically directed to the standby region if the primary region is unavailable. This reduces the manual intervention required during a failover event.
- D. Incorrect.
Incorrect: Weekly block volume backups can help recover data after a disaster, but they do not provide near-zero data loss or immediate failover capability. This approach introduces significant downtime and potential data loss.
- E. Incorrect.
Incorrect: Fault Domains help mitigate hardware failures within a single Availability Domain, but they do not protect against an entire region going offline. A second region is required for reliable disaster recovery.