AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: a Cosmos DB partition key determines the logical partition for an item.. 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 Cosmos DB container for session records receives hot-partition throttling because the partition key has only five possible values. What should the developer change? The design must avoid adding custom operational scripts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Choose a partition key with higher cardinality and even request distribution
Option C is correct because hot-partition throttling occurs when a partition key has low cardinality (few distinct values), causing uneven request distribution and exceeding the physical partition's throughput limits. Choosing a partition key with higher cardinality and even request distribution spreads operations across more physical partitions, eliminating throttling without custom scripts.
Key principle: A Cosmos DB partition key determines the logical partition for an item.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the default TTL
Why it's wrong here
TTL controls item expiry, not partition distribution.
✗
Enable analytical store only
Why it's wrong here
Analytical store supports analytics but does not correct transactional hot partitions.
✓
Choose a partition key with higher cardinality and even request distribution
Why this is correct
A good partition key spreads storage and throughput across logical partitions.
Related concept
A Cosmos DB partition key determines the logical partition for an item.
✗
Use a stored procedure for every write
Why it's wrong here
Stored procedures do not fix a hot partition key.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse throughput scaling mechanisms (TTL, analytical store, stored procedures) with partition key design, which is the only way to resolve hot-partition throttling without custom scripts.
Detailed technical explanation
How to think about this question
Cosmos DB uses the partition key to hash documents into logical partitions, which are mapped to physical partitions each with a fixed throughput capacity (e.g., 10,000 RU/s). With only five partition key values, all requests hash to at most five physical partitions, causing throttling when aggregate RU exceeds that limit. A high-cardinality key (e.g., userId with millions of values) ensures each physical partition handles a fraction of the total load, avoiding throttling without manual sharding.
KKey Concepts to Remember
A Cosmos DB partition key determines the logical partition for an item.
Low cardinality partition keys lead to hot partitions and throttling.
High cardinality partition keys distribute data and requests more evenly.
Choosing an effective partition key is crucial for Cosmos DB scalability and performance.
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
A Cosmos DB partition key determines the logical partition for an item.
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. A Cosmos DB partition key determines the logical partition for an item. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Review a Cosmos DB partition key determines the logical partition for an item., then practise related AZ-204 questions on the same topic to reinforce the concept.
Develop for Azure storage — This question tests Develop for Azure storage — A Cosmos DB partition key determines the logical partition for an item..
What is the correct answer to this question?
The correct answer is: Choose a partition key with higher cardinality and even request distribution — Option C is correct because hot-partition throttling occurs when a partition key has low cardinality (few distinct values), causing uneven request distribution and exceeding the physical partition's throughput limits. Choosing a partition key with higher cardinality and even request distribution spreads operations across more physical partitions, eliminating throttling without custom scripts.
What should I do if I get this AZ-204 question wrong?
Review a Cosmos DB partition key determines the logical partition for an item., then practise related AZ-204 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A Cosmos DB partition key determines the logical partition for an item.
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