Google Professional Cloud Database Engineer Exam Practice Questions
US$39
Every question with the correct answer and why the other options are wrong.
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The Professional Cloud Database Engineer exam was challenging, but I managed to pass after studying with practice tests and solid study resources. Knowing what to expect made the exam less stressful.
Three of the 197 questions in this pack
Question 1
You host an application in Google Cloud. The application is located in a single region and uses Cloud SQL for transactional data. Most of your users are located in the same time zone and expect the application to be available 7 days a week, from 6 AM to 10 PM. You want to ensure regular maintenance updates to your Cloud SQL instance without creating downtime for your users. What should you do?
Show answer and explanation
Correct answer: A. Configure a maintenance window during a period when no users will be on the system. Control the order of update by setting nonproduction instances to earlier and production instances to later.
The scenario specifies users are available only 6 AM to 10 PM in a single timezone, creating a clear maintenance window from 10 PM to 6 AM when no users are active. Option A correctly identifies this approach: schedule maintenance during the 10 PM to 6 AM window and control update ordering by applying updates to nonproduction instances first (earlier times) before production instances (later times). This ensures zero downtime for users while allowing regular maintenance.
Why the other options are wrong
- B. Read replicas help with read scaling but do not eliminate downtime during primary instance maintenance; the primary must still be updated.
- C. Notifying users and rescheduling maintenance doesn't solve the core requirement of maintaining availability during necessary updates.
- D. High availability in Cloud SQL provides automatic failover for failures, but planned maintenance still requires downtime unless a maintenance window strategy is employed.
Question 2
Your team recently released a new version of a highly consumed application to accommodate additional user traffic. Shortly after the release, you received an alert from your production monitoring team that there is consistently high replication lag between your primary instance and the read replicas of your Cloud SQL for MySQL instances. You need to resolve the replication lag. What should you do?
Show answer and explanation
Correct answer: A. Identify and optimize slow running queries, or set parallel replication flags.
Replication lag occurs when the primary instance cannot write changes to replicas fast enough, typically due to slow or resource-intensive queries on the primary. The solution is to identify and optimize these slow queries using Query Insights or slow query logs, and configure parallel replication flags to process binary log events in parallel. This addresses the root cause of the lag without requiring infrastructure changes.
Why the other options are wrong
- B. Stopping queries and recreating replicas is destructive, causes significant downtime, and does not address the underlying cause of lag.
- C. Upgrading disk and vCPU does not solve replication lag caused by slow queries; the lag persists even with more resources if queries are inefficient.
- D. Adding memory alone does not resolve replication lag; the issue is typically query efficiency and binary log processing, not memory constraints.
Question 3
Your organization operates in a highly regulated industry. Separation of concerns (SoC) and security principle of least privilege (PoLP) are critical. The operations team consists of: Person A is a database administrator. Person B is an analyst who generates metric reports. Application C is responsible for automatic backups. You need to assign roles to team members for Cloud Spanner. Which roles should you assign?
Show answer and explanation
Correct answer: A. roles/spanner.databaseAdmin for Person A roles/spanner.databaseReader for Person B roles/spanner.backupWriter for Application C
Separation of concerns and principle of least privilege require assigning the minimum necessary permissions. Person A (DBA) needs databaseAdmin to manage schema and operations. Person B (analyst) needs only databaseReader to generate reports without modification rights. Application C (backup automation) needs backupWriter to create backups without requiring full admin privileges. This combination follows least privilege by granting only the specific permissions needed for each role's responsibilities.
Why the other options are wrong
- B. BackupAdmin grants excessive permissions to Application C; it should only need backupWriter to create backups automatically.
- C. DatabaseUser for Person B allows write operations unnecessary for an analyst generating read-only reports; databaseReader is more restrictive and appropriate.
- D. DatabaseUser for Person B allows write access unsuitable for an analyst, and backupWriter is correctly identified but the Person B role is wrong.
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How much of the Google Professional Cloud Database Engineer bank is free?
197 questions in the bankEach step includes the one before, so buying only adds new questions.
- You are here10questionsFree sampleThree on this page, all ten as a PDF.Download the sample
- 4925% of the bankPractice pageFree on the site, every answer explained.Go to the practice page
- 7438% of the bankHalf PackFree by email, as one PDF, every answer explained.Get the Half Pack
- 197100%, the whole bankFull pack, US$39Plus the questions-only PDF, monthly updates, refund if you fail.Get the full pack
What’s in the Google Professional Cloud Database Engineer pack
- 197 questions mapped to the Professional Cloud Database Engineer exam guide
- Answers and explanations for every question, including the wrong options
- A questions-only PDF for timed practice runs
- Delivered by email shortly after checkout
- Free monthly updates for as long as the exam is live
- Pass or your money back
A Professional Cloud Database Engineer attempt costs US$200. This pack is US$39, paid once.
What makes the Professional Cloud Database Engineer exam hard
Professional Cloud Database Engineer is the exam for people who choose and run the databases behind Google Cloud applications, and the current guide added vector data and databases that support generative AI and LLM use cases to the design section, so AlloyDB and its AI features now appear alongside Cloud SQL, Spanner, Bigtable, Firestore and Memorystore. The questions are requirement driven: a workload, a consistency or availability need, a budget, and four databases that could all technically work.
Design is about 32% of the exam: capacity and usage planning, multi-regional versus regional versus zonal deployments, connectivity, key management and encryption, and evaluating managed versus self-managed and SQL versus NoSQL including vector databases. Managing a multi-database solution at about 25% covers IAM, backup and recovery with RTO and RPO, scaling, and cost and query optimisation.
Migration at about 23% covers zero and near-zero downtime strategies and choosing between Database Migration Service, Datastream and other tools. Deployment at about 20% covers provisioning highly available databases, testing HA and DR, and automated provisioning and monitoring.
About the exam
The Google Cloud Professional Cloud Database Engineer certification covers designing scalable and highly available database solutions, managing solutions that span multiple database technologies, migrating data solutions, and deploying scalable and highly available databases on Google Cloud. There are no prerequisites; Google recommends five or more years of database experience including two or more on Google Cloud.
Exam sections
- Design innovative, scalable, and highly available cloud database solutions: about 32%
- Manage a solution that can span multiple database technologies: about 25%
- Migrate data solutions: about 23%
- Deploy scalable and highly available databases in Google Cloud: about 20%
50 to 60 multiple choice and multiple select questions, 120 minutes, US$200 per attempt, online proctored or at a test centre, certification valid for two years. Google does not publish a fixed passing score.
Questions before you buy
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Yes. The pack is updated every month for as long as the exam is live, and updates are free for everyone who has bought it.
What if I fail the exam?
We refund the pack, or swap it for any other pack if you would rather keep studying. Sit the exam 7 to 30 days after buying, then send your official score report within 7 days of the exam date, as set out in the refund policy.
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99% of customers who prepare with a CertStash pack pass. If you do not, we refund the pack, or swap it for another pack.
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Cora Ellis –
The Professional Cloud Database Engineer exam was challenging, but I managed to pass after studying with practice tests and solid study resources. Knowing what to expect made the exam less stressful.
Ira Verma –
Cloud database concepts were deep but well explained in practice questions. Practice questions tested real-world tasks and prepared me strongly.