AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You are developing an application that reads data from Azure Table Storage. The application must retrieve all entities for a specific partition key. Which query approach is the most efficient?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Query with a filter on PartitionKey only.
In Azure Table Storage, the PartitionKey is the primary index for partitioning data. Querying with a filter on PartitionKey only allows the service to perform a partition scan, which is the most efficient way to retrieve all entities within a single partition because it avoids cross-partition queries and leverages the partition-level index directly.
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.
✗
Query with a filter on RowKey only.
Why it's wrong here
Without PartitionKey, the query may scan multiple partitions.
✗
Query with a filter on both PartitionKey and RowKey.
Why it's wrong here
This is also efficient but overkill if you only need all entities for a partition.
✗
Query all entities and filter in application code.
Why it's wrong here
Retrieving all entities is inefficient and costly.
✓
Query with a filter on PartitionKey only.
Why this is correct
Querying by PartitionKey targets a single partition efficiently.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume filtering on both PartitionKey and RowKey is the most efficient, but that retrieves only a single entity, not all entities for a partition, while filtering on PartitionKey alone is the correct and most efficient approach for retrieving all entities in a partition.
Detailed technical explanation
How to think about this question
Azure Table Storage uses a two-level indexing scheme: PartitionKey for partition-level indexing and RowKey for entity-level ordering within a partition. A query with only a PartitionKey filter executes as a partition scan, which is O(n) where n is the number of entities in that partition, but avoids the O(N) cost of a full table scan (N = total entities across all partitions). This design is critical for high-scale scenarios, such as IoT telemetry where each device writes to its own partition, and reading all data for a device requires only a partition scan.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Query with a filter on PartitionKey only. — In Azure Table Storage, the PartitionKey is the primary index for partitioning data. Querying with a filter on PartitionKey only allows the service to perform a partition scan, which is the most efficient way to retrieve all entities within a single partition because it avoids cross-partition queries and leverages the partition-level index directly.
What should I do if I get this AZ-204 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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Question Discussion
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