Question 94 of 1,446
PCDE Logical Replication Practice Question
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.
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.
- ✗
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.
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Last reviewed: Jul 4, 2026
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