The answer is to use Database Migration Service for PostgreSQL with continuous migration from Oracle via Homogeneous Migration. This approach is correct because Database Migration Service (DMS) supports ongoing change data capture (CDC) from Oracle to Cloud SQL for PostgreSQL, enabling near-zero downtime by continuously replicating incremental changes while the source remains live. On the Google Professional Cloud Architect exam, this scenario tests your understanding of minimizing downtime through continuous replication versus batch export/import methods; a common trap is choosing a one-time dump or logical replication without CDC, which forces an outage window. Remember that DMS handles schema conversion automatically and keeps the target synchronized until a clean cutover, making it the only option that truly minimizes downtime for heterogeneous migrations. Memory tip: think “CDC = Continuous Data Cutover” to recall that continuous replication, not batch, is the key to near-zero downtime.
Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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 migrating its on-premises Oracle database to Cloud SQL for PostgreSQL. The database team wants to minimize downtime during migration. Which approach should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Database Migration Service for PostgreSQL with continuous migration from Oracle via Homogeneous Migration.
Database Migration Service (DMS) for PostgreSQL with continuous migration is the correct approach because it supports ongoing change data capture (CDC) from Oracle to Cloud SQL for PostgreSQL, enabling near-zero downtime. DMS handles schema conversion and data replication continuously, allowing the target to stay synchronized until a cutover, which minimizes downtime compared to batch methods.
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.
✗
Set up Oracle GoldenGate to replicate to Cloud SQL.
Why it's wrong here
GoldenGate is not directly supported for Cloud SQL PostgreSQL.
✓
Use Database Migration Service for PostgreSQL with continuous migration from Oracle via Homogeneous Migration.
Why this is correct
DMS supports minimal downtime via continuous replication.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Take a physical backup of Oracle and restore to Cloud SQL.
Why it's wrong here
Physical backups are not compatible with Cloud SQL PostgreSQL.
✗
Export the database as a dump file, upload to Cloud Storage, and import into Cloud SQL.
Why it's wrong here
This approach requires application downtime during export and import.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that any 'migration service' automatically supports heterogeneous migrations, but here the trap is that Database Migration Service for PostgreSQL is specifically designed for PostgreSQL targets and includes built-in schema conversion from Oracle, whereas options like GoldenGate or dump/restore are either too complex or cause downtime.
Detailed technical explanation
How to think about this question
Database Migration Service uses a replication slot on the source Oracle database to capture changes via LogMiner or XStream, converting them to PostgreSQL-compatible SQL in near real-time. During the initial load, DMS performs a consistent snapshot using Oracle's Flashback Query or RMAN incremental backups, then applies CDC to keep the target synchronized. In a real-world scenario, a financial services company migrated a 2 TB Oracle OLTP database with under 5 minutes of cutover downtime by using DMS with a pre-provisioned Cloud SQL instance and a final switchover during a maintenance window.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Database Migration Service for PostgreSQL with continuous migration from Oracle via Homogeneous Migration. — Database Migration Service (DMS) for PostgreSQL with continuous migration is the correct approach because it supports ongoing change data capture (CDC) from Oracle to Cloud SQL for PostgreSQL, enabling near-zero downtime. DMS handles schema conversion and data replication continuously, allowing the target to stay synchronized until a cutover, which minimizes downtime compared to batch methods.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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