Question 810 of 1,446
PCDE Migrate data solutions Practice Question
An organization is migrating a MySQL database to Cloud SQL using DMS with continuous replication. After promoting the destination, they need a rollback plan. Which approach should they use to enable a quick rollback if issues arise?
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
✓
Keep the source database running in read-only mode for a few days.
A rollback plan should keep the source database running but read-only for a validation window. This allows switching back if needed without data loss.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete the source database immediately after promotion.
Why it's wrong here
Deleting source eliminates rollback possibility.
- ✗
Take a snapshot of the source database before promotion.
Why it's wrong here
Snapshot can be used but is not as immediate as keeping source read-only; also changes after promotion would be lost if rolling back.
- ✓
Keep the source database running in read-only mode for a few days.
Why this is correct
Read-only source allows validation and rollback if issues occur.
- ✗
Enable binary logging on the Cloud SQL instance after promotion.
Why it's wrong here
This does not help rollback; it prepares for future replication.
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Last reviewed: Jul 4, 2026
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