- A
Use a continuous migration job with CDC only, skipping the initial dump.
Why wrong: CDC only cannot handle the initial data load; a full dump is required first.
- B
Use a batch migration job that exports Oracle data to CSV files and loads them into AlloyDB.
Why wrong: This is not supported by DMS for Oracle to AlloyDB; DMS uses logical replication.
- C
Use a one-time full dump migration job and then manually import the dump into AlloyDB.
Why wrong: This approach has high downtime and does not capture changes during migration.
- D
Use a continuous migration job that performs an initial full dump followed by CDC replication.
Continuous migration with CDC minimises downtime and ensures consistency.
Question 505 of 999
PCD Practice Question: Manage a Solution that Can Span Multiple Database Systems
This PCD practice question tests your understanding of manage a solution that can span multiple database systems. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 an on-premises Oracle database to AlloyDB for PostgreSQL. They need to minimize downtime and ensure data consistency. They plan to use Database Migration Service (DMS). Which migration job type and configuration 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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a continuous migration job that performs an initial full dump followed by CDC replication.
Option D is correct because Database Migration Service (DMS) continuous migration jobs perform an initial full dump to establish a baseline, then use Change Data Capture (CDC) to replicate ongoing changes from the source Oracle database to AlloyDB for PostgreSQL. This approach minimizes downtime by allowing the target to stay synchronized with the source until a cutover, ensuring data consistency without requiring a separate manual import step.
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.
- ✗
Use a continuous migration job with CDC only, skipping the initial dump.
Why it's wrong here
CDC only cannot handle the initial data load; a full dump is required first.
- ✗
Use a batch migration job that exports Oracle data to CSV files and loads them into AlloyDB.
Why it's wrong here
This is not supported by DMS for Oracle to AlloyDB; DMS uses logical replication.
- ✗
Use a one-time full dump migration job and then manually import the dump into AlloyDB.
Why it's wrong here
This approach has high downtime and does not capture changes during migration.
- ✓
Use a continuous migration job that performs an initial full dump followed by CDC replication.
Why this is correct
Continuous migration with CDC minimises downtime and ensures consistency.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'continuous migration' with 'CDC-only' (Option A), not realizing that Google DMS requires an initial full load to establish the baseline before CDC can begin, or they may incorrectly assume a batch or manual import approach (Options B and C) is suitable for minimizing downtime and ensuring consistency.
Detailed technical explanation
How to think about this question
DMS continuous migration leverages Oracle's LogMiner or XStream APIs to capture redo log changes in near real-time, applying them to AlloyDB via PostgreSQL logical replication slots. The initial dump uses pg_dump or a parallel logical dump to create a consistent snapshot, and CDC then streams incremental changes, allowing a cutover with seconds of downtime. In practice, this is critical for production databases where even minutes of downtime can impact SLAs, and the CDC lag must be monitored to ensure the target stays within acceptable sync thresholds.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this PCD question test?
Manage a Solution that Can Span Multiple Database Systems — This question tests Manage a Solution that Can Span Multiple Database Systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a continuous migration job that performs an initial full dump followed by CDC replication. — Option D is correct because Database Migration Service (DMS) continuous migration jobs perform an initial full dump to establish a baseline, then use Change Data Capture (CDC) to replicate ongoing changes from the source Oracle database to AlloyDB for PostgreSQL. This approach minimizes downtime by allowing the target to stay synchronized with the source until a cutover, ensuring data consistency without requiring a separate manual import step.
What should I do if I get this PCD 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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Last reviewed: Jul 4, 2026
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