DBS-C01 Deployment and Migration Practice Question
A company is migrating a self-managed Oracle database to Amazon Aurora PostgreSQL using AWS DMS. The source database has a large number of tables with foreign key constraints. During the full load phase, some tables fail to load due to foreign key violations. What is the most efficient way to resolve this?
⚠ Common exam trap
Many exam-takers think increasing resources (Option A) or pre-creating tables (Option D) will solve the issue, but they overlook that foreign key violations are a logical dependency problem, not a performance or schema creation issue.
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
✓
Disable foreign key constraints on the target before migration and re-enable after
Disabling foreign key constraints on the target Aurora PostgreSQL database before the migration allows DMS to load tables in any order without violating referential integrity. After the full load completes, re-enabling the constraints ensures data consistency. This approach is the most efficient as it avoids complex dependency ordering and reduces migration failures.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the DMS task memory and parallel load threads
Why it's wrong here
This improves performance but does not resolve constraint violations.
- ✗
Use the table preparation mode 'Do nothing' and load tables in dependency order
Why it's wrong here
Manually ordering tables is error-prone and may still cause violations.
- ✓
Disable foreign key constraints on the target before migration and re-enable after
Why this is correct
This allows flexible loading order and avoids violations.
- ✗
Pre-create all target tables with the same constraints and use 'Truncate' mode
Why it's wrong here
Pre-creating with constraints still causes violations if load order is wrong.
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