DBS-C01 Workload-Specific Database Design Practice Question
A company is migrating an on-premises MongoDB database to Amazon DocumentDB (with MongoDB compatibility). The application uses MongoDB's aggregation pipeline with $lookup and $unwind stages. What should the company verify before migration?
⚠ Common exam trap
A common mix-up: candidates assume DocumentDB is fully MongoDB-compatible and overlook the specific limitations in the aggregation pipeline, especially for advanced stages like `$facet` and `$graphLookup`, which are not supported.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check if all aggregation pipeline stages used by the application are supported in DocumentDB.
Amazon DocumentDB (with MongoDB compatibility) does not support all MongoDB aggregation pipeline stages. Specifically, the `$lookup` and `$unwind` stages are supported, but other stages like `$merge`, `$facet`, `$bucket`, `$bucketAuto`, `$graphLookup`, and `$search` are not. Before migration, the company must verify that every stage used in their application's aggregation pipelines is fully supported in DocumentDB to avoid runtime 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.
- ✓
Check if all aggregation pipeline stages used by the application are supported in DocumentDB.
Why this is correct
DocumentDB has limitations on some aggregation stages; verifying compatibility is essential.
- ✗
Verify that DocumentDB supports sharding for the collection.
Why it's wrong here
DocumentDB supports sharding, but not all MongoDB sharding features.
- ✗
Ensure the application uses the latest MongoDB driver.
Why it's wrong here
Driver compatibility is usually fine; the focus should be on feature parity.
- ✗
Confirm that the application's secondary indexes can be migrated.
Why it's wrong here
Secondary indexes are supported in DocumentDB; this is generally not an issue.
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