The answer is that setting up VPC peering or a VPN to connect on-premises to Google Cloud is one of three key prerequisites for migrating Oracle to Cloud SQL. This is correct because Cloud SQL does not support Oracle’s proprietary PL/SQL syntax, meaning you must convert Oracle-specific elements like sequences, packages, and hierarchical queries to the target dialect—either PostgreSQL or MySQL—before migration. On the Google Professional Cloud Database Engineer exam, this question tests your understanding that network connectivity and syntax conversion are foundational steps, not optional optimizations. A common trap is assuming Cloud SQL can natively run Oracle code, but the exam emphasizes that only PostgreSQL and MySQL engines are available. For a memory tip, think “Connect and Convert”: first establish the network link via VPC or VPN, then convert PL/SQL to the target dialect to ensure the database functions correctly post-migration.
PCDE Plan and manage database infrastructure Practice Question
This PCDE practice question tests your understanding of plan and manage database infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is planning to migrate their on-premises Oracle database to Cloud SQL. Which THREE prerequisites must be satisfied?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Convert Oracle-specific syntax to PostgreSQL or MySQL
Option A is correct because Cloud SQL does not support Oracle's proprietary PL/SQL syntax. When migrating from Oracle to Cloud SQL, you must convert Oracle-specific syntax (e.g., sequences, packages, hierarchical queries) to the target dialect—either PostgreSQL or MySQL—since Cloud SQL offers only these two engines. This conversion is a prerequisite to ensure the migrated database functions correctly after the move.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Convert Oracle-specific syntax to PostgreSQL or MySQL
Why this is correct
Database Migration Service handles schema conversion, but manual tuning may be needed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Purchase Cloud SQL Enterprise Plus edition for the target instance
Why it's wrong here
Enterprise Plus is not required for migration; any edition works.
✓
Ensure the source database is compatible with Database Migration Service (DMS)
Why this is correct
DMS supports specific source versions and configurations.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set up VPC peering or VPN to connect on-premises to Google Cloud
Why this is correct
Network connectivity is required for replication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a Cloud Storage bucket for staging migration data
Why it's wrong here
A staging bucket is optional and not a prerequisite; DMS can stream directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud SQL supports Oracle as a native engine, leading candidates to overlook the mandatory syntax conversion, or that a staging bucket is always required when DMS can perform direct migration without intermediate storage.
Detailed technical explanation
How to think about this question
Database Migration Service (DMS) for Cloud SQL uses continuous change data capture (CDC) to minimize downtime, leveraging Oracle LogMiner or GoldenGate to read redo logs. The conversion of Oracle syntax is critical because Cloud SQL's PostgreSQL dialect lacks Oracle-specific features like CONNECT BY and materialized views with refresh options, requiring manual or tool-assisted refactoring. In real-world scenarios, failing to convert PL/SQL packages can cause stored procedures to break silently post-migration.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Plan and manage database infrastructure — This question tests Plan and manage database infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Convert Oracle-specific syntax to PostgreSQL or MySQL — Option A is correct because Cloud SQL does not support Oracle's proprietary PL/SQL syntax. When migrating from Oracle to Cloud SQL, you must convert Oracle-specific syntax (e.g., sequences, packages, hierarchical queries) to the target dialect—either PostgreSQL or MySQL—since Cloud SQL offers only these two engines. This conversion is a prerequisite to ensure the migrated database functions correctly after the move.
What should I do if I get this PCDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is migrating an on-premises Oracle database to Cloud SQL for PostgreSQL. The database is 2 TB in size and the network bandwidth to Google Cloud is limited to 500 Mbps. The migration window is 48 hours. Which migration strategy should the Database Engineer recommend?
medium
A.Create a VPN tunnel and use pg_dump/pg_restore over the network.
B.Use Database Migration Service with continuous replication.
✓ C.Export the database to flat files, compress, upload to Cloud Storage, then import to Cloud SQL.
D.Request a dedicated interconnect and then migrate.
Why C: Option C is correct because the 2 TB database size and 500 Mbps bandwidth yield a theoretical transfer time of approximately 9.5 hours (2 TB * 1024 GB/TB * 8 bits/byte / 500 Mbps / 3600 seconds/hour), which fits within the 48-hour window. However, pg_dump/pg_restore over a VPN (Option A) would be slower due to TCP overhead and latency, and Database Migration Service with continuous replication (Option B) requires ongoing connectivity and may not complete the initial load within the window. Exporting to flat files, compressing them (e.g., with gzip), uploading to Cloud Storage, and then importing to Cloud SQL leverages high-throughput parallel uploads and avoids network latency issues, making it the most reliable strategy for a one-time migration within the given constraints.
Variation 2. A company is migrating their on-premises Oracle database to Cloud SQL for PostgreSQL. They want to minimize downtime during the cutover. Which two strategies should the database engineer recommend? (Choose 2.)
medium
A.Use a Cloud VPN tunnel for data transfer.
✓ B.Use Database Migration Service with continuous replication.
✓ C.Use a third-party tool like pglogical for replication.
D.Use Cloud SQL for PostgreSQL with read replicas and promote.
E.Perform an export using pg_dump and import using psql.
Why B: Database Migration Service (DMS) with continuous replication is correct because it supports minimal-downtime migrations from Oracle to Cloud SQL for PostgreSQL by continuously replicating changes from the source to the target until cutover. This allows the source database to remain operational during most of the migration, with only a brief pause to finalize the switch.
Last reviewed: Jun 30, 2026
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This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.
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