1Z0-997-25 Question 31
Single answerA financial services company runs a mission-critical transaction processing application in a primary OCI region with multiple Availability Domains. They want to design a disaster recovery (DR) solution in a secondary region that delivers near-zero downtime if the primary region becomes unavailable, while adding minimal overhead to daily operations. Which approach best meets these requirements?
- A
Deploy the application in multiple Availability Domains within the same region and perform daily block volume backups.
- B
Configure Oracle Data Guard with synchronous replication to a standby database in the secondary region, enabling automatic failover.
- C
Use Oracle Data Guard in asynchronous mode with a standby database in the secondary region and enable Fast-Start Failover for failover automation.
- D
Rely on block volume cross-region replication configured every six hours, combined with a manual failover in the secondary region.
Show answer and explanation
Correct answer: C
Explanation
Using Oracle Data Guard in asynchronous mode with Fast-Start Failover (FSFO) balances performance overhead and recovery objectives. Asynchronous replication avoids the latency penalty of synchronous replication, while FSFO automates failover to the standby. This approach is recommended in Oracle� Data Guard Best Practices for scenarios where minimal downtime and balanced overhead are desired. For more details, refer to Oracle Cloud Infrastructure documentation on Data Guard and Fast-Start Failover configurations.
- A. Incorrect.
Option 1 is incorrect because having all resources in a single region with daily backups does not protect against a region-wide outage and would not provide near-zero downtime. Daily backups may also lead to significant data loss if a failover is required during the day.
- B. Incorrect.
Option 2 is a viable approach for near-zero data loss, but synchronous replication across regions can introduce significant performance overhead due to potential latency. This goes against the requirement of minimal overhead on the primary region� operations.
- C. Correct.
Option 3 is correct. Asynchronous replication with Oracle Data Guard significantly reduces performance overhead compared to synchronous replication, while Fast-Start Failover automates the failover process, helping achieve near-zero downtime. Although there's a small risk of losing transactions if the primary fails at the exact time of replication, this approach meets the stated requirement for minimal overhead and automated failover.
- D. Incorrect.
Option 4 is incorrect because block volume cross-region replication every six hours introduces too large a gap for near-zero downtime. Additionally, requiring a manual failover process would increase recovery time far beyond near-zero downtime.