- A
Create the index using the gcloud datastore indexes create command with a YAML file.
Composite indexes are manually defined via a YAML file and created with gcloud.
- B
Modify the query to use a single filter to avoid needing a composite index.
Why wrong: This may not meet requirements and avoids the real solution.
- C
Enable the 'auto-index' feature in the Datastore console.
Why wrong: There is no such feature; composite indexes must be manual.
- D
The index will be created automatically based on the query pattern.
Why wrong: Automatic index creation only applies to single-field indexes.
Question 804 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses Firestore in Datastore mode. They need to create a composite index for a query that filters on two properties. The query is already running and returning an error that an index is required. What is the correct way to create this index?
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 the index using the gcloud datastore indexes create command with a YAML file.
Option A is correct because in Firestore (Datastore mode), composite indexes must be explicitly created before they can be used by queries that filter on multiple properties. The `gcloud datastore indexes create` command with a YAML file is the standard method to define and deploy these indexes, as the Datastore mode does not automatically create composite indexes from query patterns.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 the index using the gcloud datastore indexes create command with a YAML file.
Why this is correct
Composite indexes are manually defined via a YAML file and created with gcloud.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the query to use a single filter to avoid needing a composite index.
Why it's wrong here
This may not meet requirements and avoids the real solution.
- ✗
Enable the 'auto-index' feature in the Datastore console.
Why it's wrong here
There is no such feature; composite indexes must be manual.
- ✗
The index will be created automatically based on the query pattern.
Why it's wrong here
Automatic index creation only applies to single-field indexes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google often tests the misconception that Datastore mode automatically creates composite indexes from query patterns, similar to Firestore Native mode's automatic index creation, but in Datastore mode, composite indexes must be manually defined.
Detailed technical explanation
How to think about this question
Firestore in Datastore mode uses a built-in index on each property individually, but queries that filter on multiple properties require a composite index that is defined in an `index.yaml` file. When you run `gcloud datastore indexes create`, the service validates the YAML definition and builds the index asynchronously, which may take minutes depending on the size of the existing data. A common real-world scenario is when a query fails with a 'no matching index found' error, and the error message even provides a suggested index definition that can be copied directly into the YAML file.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Manage Database Solutions — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Manage Database Solutions — This question tests Manage Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create the index using the gcloud datastore indexes create command with a YAML file. — Option A is correct because in Firestore (Datastore mode), composite indexes must be explicitly created before they can be used by queries that filter on multiple properties. The `gcloud datastore indexes create` command with a YAML file is the standard method to define and deploy these indexes, as the Datastore mode does not automatically create composite indexes from query patterns.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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