- A
To enable point-in-time recovery on the source.
Why wrong: Point-in-time recovery is a use of WAL, but in the context of DMS migration, the purpose of logical replication is to capture changes for continuous replication, not for PITR.
- B
To improve performance of the initial dump.
Why wrong: Logical replication does not improve the performance of the initial dump; the initial dump uses pg_dump. Logical replication starts after the dump to capture incremental changes.
- C
To capture changes for continuous replication after the initial dump.
Correct. Logical replication uses WAL to capture changes in real-time, allowing continuous replication after the initial data load.
- D
To convert data types between source and destination.
Why wrong: Data type conversion is performed by DMS during schema conversion, not by logical replication.
PCDOE Logical Replication Practice Question
This PCDOE practice question tests your understanding of migrate database solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: logical Replication. 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 a PostgreSQL database to Cloud SQL using DMS. The source database has logical replication enabled for the migration. What is the purpose of logical replication in this context?
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
To capture changes for continuous replication after the initial dump.
DMS uses PostgreSQL logical replication to capture ongoing changes. The source database must have logical replication enabled (via WAL with logical decoding) to allow DMS to replicate changes continuously after the initial dump. Binary logging is a MySQL concept, not applicable to PostgreSQL.
Key principle: Logical Replication
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To enable point-in-time recovery on the source.
Why it's wrong here
Point-in-time recovery is a use of WAL, but in the context of DMS migration, the purpose of logical replication is to capture changes for continuous replication, not for PITR.
- ✗
To improve performance of the initial dump.
Why it's wrong here
Logical replication does not improve the performance of the initial dump; the initial dump uses pg_dump. Logical replication starts after the dump to capture incremental changes.
- ✓
To capture changes for continuous replication after the initial dump.
Why this is correct
Correct. Logical replication uses WAL to capture changes in real-time, allowing continuous replication after the initial data load.
Related concept
Logical Replication
- ✗
To convert data types between source and destination.
Why it's wrong here
Data type conversion is performed by DMS during schema conversion, not by logical replication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Logical Replication
- Database Migration Service (DMS)
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
Logical Replication
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. Logical Replication 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.
Review logical Replication, then practise related PCDOE questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Migrate Database Solutions — This question tests Migrate Database Solutions — Logical Replication.
What is the correct answer to this question?
The correct answer is: To capture changes for continuous replication after the initial dump. — DMS uses PostgreSQL logical replication to capture ongoing changes. The source database must have logical replication enabled (via WAL with logical decoding) to allow DMS to replicate changes continuously after the initial dump. Binary logging is a MySQL concept, not applicable to PostgreSQL.
What should I do if I get this PCDOE question wrong?
Review logical Replication, then practise related PCDOE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Logical Replication
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Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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