PCDE Migrate data solutions Practice Question
A company is migrating a PostgreSQL database to Cloud SQL using DMS with continuous CDC. During cutover, the engineer checks DMS metrics and sees the replication lag is consistently 0 seconds. What is the next step to complete the migration?
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
✓
Promote the destination Cloud SQL instance.
When the lag is 0, the source and target are in sync. The next step is to promote the destination (Cloud SQL) to make it the primary, which stops replication and allows writes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Promote the destination Cloud SQL instance.
Why this is correct
Promoting makes Cloud SQL the primary and stops replication.
- ✗
Restart the migration job.
Why it's wrong here
No need; the job is running with zero lag.
- ✗
Increase the number of DMS worker nodes.
Why it's wrong here
Workers are not configurable; zero lag indicates sufficient capacity.
- ✗
Delete the source database.
Why it's wrong here
The source should be kept for rollback until promotion is successful and applications are verified.
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