PCDE Practice Question: Manage a solution that can span multiple database technologies
A company uses Firestore in Native mode. They have a collection with 1 million documents and frequently run queries that filter on two fields: status and createdAt. The queries are slow. What should the team do?
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
✓
Create a composite index on (status, createdAt)
Firestore creates single-field indexes automatically but for multi-field queries, a composite index must be created manually. Without it, queries may be slow or fail.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a composite index on (status, createdAt)
Why this is correct
Composite indexes are required for queries on multiple fields to be efficient.
- ✗
Create an index exemption for the status field
Why it's wrong here
Index exemptions are for arrays/maps, not for query performance.
- ✗
Use the Datastore mode instead
Why it's wrong here
Switching modes is not necessary and does not automatically create composite indexes.
- ✗
Add an index exemption for the createdAt field
Why it's wrong here
Exemptions are not for performance.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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