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Question 102 - Professional Cloud Database Engineer discussion

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You have a Cloud SQL instance (DB-1) with two cross-region read replicas (DB-2 and DB-3). During a business continuity test, the primary instance (DB-1) was taken offline and a replica (DB-2) was promoted. The test has concluded and you want to return to the pre-test configuration. What should you do?

A.
Bring DB-1 back online.
Answers
A.
Bring DB-1 back online.
B.
Delete DB-1, and re-create DB-1 as a read replica in the same region as DB-1.
Answers
B.
Delete DB-1, and re-create DB-1 as a read replica in the same region as DB-1.
C.
Delete DB-2 so that DB-1 automatically reverts to the primary instance.
Answers
C.
Delete DB-2 so that DB-1 automatically reverts to the primary instance.
D.
Create DB-4 as a read replica in the same region as DB-1, and promote DB-4 to primary.
Answers
D.
Create DB-4 as a read replica in the same region as DB-1, and promote DB-4 to primary.
Suggested answer: D

Explanation:

If you need to have the primary instance in the zone that had the outage, you can do a failback. A failback performs the same steps as the failover, only in the opposite direction, to reroute traffic back to the original instance. To perform a failback, use the procedure in Initiating failover. https://cloud.google.com/sql/docs/mysql/high-availability#failback

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asked 18/09/2024
Corentin ADJOVI
36 questions
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