Google Exam Professional-Cloud-Database-Engineer Topic 3 Question 25 Discussion

Actual exam question for Google's Professional Cloud Database Engineer exam

Question #: 25
Topic #: 3

[All Professional Cloud Database Engineer Questions]

You are the DBA of an online tutoring application that runs on a Cloud SQL for PostgreSQL database. You are testing the implementation of the cross-regional failover configuration. The database in region R1 fails over successfully to region R2, and the database becomes available for the application to process dat

a. During testing, certain scenarios of the application work as expected in region R2, but a few scenarios fail with database errors. The application-related database queries, when executed in isolation from Cloud SQL for PostgreSQL in region R2, work as expected. The application performs completely as expected when the database fails back to region R1. You need to identify the cause of the database errors in region R2. What should you do?

ADetermine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.

BDetermine whether the database patches of Cloud SQI for PostgreSQL in regions R1 and R2 are different.

CDetermine whether the failover of Cloud SQL for PostgreSQL from region R1 to region R2 is in progress or has completed successfully.

DDetermine whether Cloud SQL for PostgreSQL in region R2 is a near-real-time copy of region R1 but not an exact copy.

Show Suggested Answer

Suggested Answer: D

Verify that the replica has processed all the transactions it has received from the primary. This ensures that when promoted, the replica reflects all transactions that were received before the primary became unavailable. https://cloud.google.com/sql/docs/postgres/replication/cross-region-replicas#verify_failover_criteria

by Cyndy at Jan 27, 2024, 04:01 AM

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Aleta

6 months ago

Hmm, I wonder if the database in region R2 is secretly running a version of PostgreSQL that's been heavily modified by the Cloud SQL team, with some hidden features that are causing issues. Or maybe they just forgot to add the 'magical unicorn dust' that keeps the database happy in region R2. *chuckles*

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Katina

5 months ago

D) Determine whether Cloud SQL for PostgreSQL in region R2 is a near-real-time copy of region R1 but not an exact copy.

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Francisca

6 months ago

C) Determine whether the failover of Cloud SQL for PostgreSQL from region R1 to region R2 is in progress or has completed successfully.

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Yuki

6 months ago

A) Determine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.

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Evangelina

6 months ago

B) Determine whether the database patches of Cloud SQL for PostgreSQL in regions R1 and R2 are different.

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Yvonne

6 months ago

A) Determine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.

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Lajuana

6 months ago

You know, I was leaning towards option B at first, thinking there might be some database patches missing in region R2. But the fact that the application-related queries work in isolation makes me doubt that's the issue. I'm with you guys on option D - it just makes the most sense given the information provided.

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Quentin

6 months ago

I agree, option D does seem the most plausible explanation. The fact that the application works as expected when the database fails back to region R1 suggests that the issue is specific to the database in region R2. It could be that the replication process is not keeping the databases in perfect sync, leading to some inconsistencies.

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Timothy

6 months ago

Hmm, this question seems to be testing our understanding of the cross-regional failover process and potential issues that might arise. I'm thinking option D might be the most likely culprit here. If the database in region R2 is not an exact copy of the one in region R1, it could explain why certain scenarios are failing, even though the queries work in isolation.

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