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

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 data. 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?
D) Determine whether Cloud SQL for PostgreSQL in region R2 is a near-real-time copy of region R1 but not an exact copy.
A) Determine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.
B) Determine whether the database patches of Cloud SQI for PostgreSQL in regions R1 and R2 are different.
C) Determine whether the failover of Cloud SQL for PostgreSQL from region R1 to region R2 is in progress or has completed successfully.

Google Professional Cloud Database Engineer Exam - 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?

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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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Lamar
9 months ago
I doubt it's the failover process; it should be smooth.
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France
10 months ago
Wait, are they not exact copies? That seems risky!
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Alease
10 months ago
I agree, the patches are often overlooked!
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Jenifer
10 months ago
I think it's definitely the database patches causing issues.
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Jacquelyne
10 months ago
Check the versions in R1 and R2 first. Could be a mismatch.
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Daron
10 months ago
I think the idea of R2 being a near-real-time copy is interesting. If it's not an exact copy, that could explain some discrepancies in the application behavior.
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Deane
11 months ago
I feel like the failover status could be a factor, but I can't recall if it would directly cause the errors we're seeing.
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Marylin
11 months ago
I'm not entirely sure, but I think checking the database patches might be important too. We had a practice question about patching that seemed relevant.
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Emmanuel
11 months ago
I remember we discussed version differences in our study group. If R1 and R2 have different versions, that could definitely cause issues.
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Carlton
11 months ago
I feel pretty confident about this one. I'd focus on checking the database versions and patches first, as that seems like the most likely culprit based on the information provided.
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Ligia
11 months ago
Okay, my strategy would be to first determine if the database in region R2 is an exact copy of the one in region R1. If it's not, that could explain why certain scenarios are failing.
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Cyndy
11 months ago
Hmm, I'm a bit confused here. Is the failover still in progress or has it completed successfully? That could be a key factor in understanding what's going on.
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Ammie
11 months ago
This seems like a tricky one. I'd start by checking if the database versions and patches are the same between the two regions. That could definitely cause issues if they're not aligned.
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Justine
11 months ago
For this type of question, I find it helpful to consider the key characteristics of each business environment. Mature and fragmented seems like the best fit based on the strategies mentioned.
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Leeann
11 months ago
Hmm, I'm not too sure about this one. I'll have to think it through carefully. Maybe the peer-to-peer option could work, but I'm not confident.
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Maxima
11 months ago
I'm a bit confused by the wording of the question. Does "choose two" mean we have to select exactly two options, or can we choose just one if we think that's the best solution? I want to make sure I understand the requirements before answering.
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Aleta
2 years 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
2 years 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
2 years 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
2 years ago
A) Determine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.
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Evangelina
2 years ago
B) Determine whether the database patches of Cloud SQL for PostgreSQL in regions R1 and R2 are different.
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Yvonne
2 years ago
A) Determine whether the versions of Cloud SQL for PostgreSQL in regions R1 and R2 are different.
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Lajuana
2 years 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
2 years 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
2 years 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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