Question 999 of 1,663
DBS-C01 Workload-Specific Database Design Practice Question
A company is migrating an on-premises MongoDB database to Amazon DocumentDB. The current MongoDB workload uses aggregation pipelines with the $lookup stage and geospatial queries. The migration tool reports that some aggregation stages are not supported. Which THREE actions should the company take to address the incompatibilities?
⚠ Common exam trap
Many exam-takers confuse $geoWithin (a query operator) with $geoNear (an aggregation stage), or assume that $graphLookup can be emulated with recursive queries in DocumentDB, which is 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
✓
Use $geoNear for geospatial queries as it is supported in DocumentDB.
DocumentDB supports the $geoNear aggregation stage for geospatial queries, making option B a valid action to address incompatibilities. The migration tool flagged unsupported stages, and $geoNear is explicitly supported in DocumentDB for location-based queries, whereas $geoWithin is not available in aggregation pipelines.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace $lookup with $geoWithin for location-based queries.
Why it's wrong here
$geoWithin is for geospatial, not joins.
- ✓
Use $geoNear for geospatial queries as it is supported in DocumentDB.
Why this is correct
DocumentDB supports $geoNear.
- ✗
Convert $graphLookup to use recursive queries in DocumentDB.
Why it's wrong here
DocumentDB does not support $graphLookup.
- ✓
Denormalize the data to avoid $lookup by embedding related documents.
Why this is correct
Embedding related data eliminates the need for $lookup.
- ✓
Rewrite $lookup stages as application-side joins or use references.
Why this is correct
DocumentDB does not support $lookup; application-side joins are needed.
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Last reviewed: Jul 4, 2026
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