Question 873 of 982

Describe considerations for working with non-relational data on Azure →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is PlayerID as the partition key with Strong consistency. PlayerID is the correct partition key because the most common query retrieves a player by their unique identifier, ensuring the query targets a single logical partition for fast, efficient reads and writes. Strong consistency guarantees that once a player’s achievement write is committed, all subsequent reads will immediately reflect that update, which is essential for a gaming scenario where real-time visibility prevents confusion or data loss. On the DP-900 exam, this question tests your ability to map query patterns to partition key design and match consistency requirements to business needs—a common trap is choosing a high-cardinality key like Email or a weak consistency level like Eventual, which would break the immediate visibility requirement. Remember the memory tip: “For unique lookups, partition on the lookup field; for instant updates, choose Strong.”

DP-900 Practice Question: Describe considerations for working with non-relational data on Azure

This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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.

A global gaming company stores player profiles in Azure Cosmos DB. Each profile document contains PlayerID (unique), PlayerName, Email, and a nested array of Achievements. The most common query is to look up a player by PlayerID and retrieve their achievements. The company needs strong consistency for reads and writes to ensure that when a player earns an achievement, it is immediately visible. Which partition key and consistency level should they choose?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

Question 1hardmultiple choice

Full question →

A
A. Partition key: PlayerID; Consistency: Eventual
Why wrong: PlayerID is a good partition key for point lookups, but eventual consistency does not guarantee that a write is immediately visible to reads, which violates the requirement.
B
B. Partition key: PlayerID; Consistency: Strong
PlayerID makes each player's document a single partition, enabling efficient lookups. Strong consistency ensures that once a write is committed, subsequent reads return the latest data.
C
C. Partition key: Achievements; Consistency: Strong
Why wrong: Achievements is an array property; using it as a partition key would create many partitions with unpredictable cardinality and cannot be used for point lookups by PlayerID.
D
D. Partition key: Email; Consistency: Bounded staleness
Why wrong: Email might be a candidate but could lead to hot partitions if many players share email domains. Bounded staleness is not the strongest consistency level and may not meet the immediate visibility requirement.

Full breakdown with real-world context →

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

✓

B. Partition key: PlayerID; Consistency: Strong

Option B is correct because PlayerID is the natural partition key for the most common query (lookup by PlayerID), ensuring efficient single-partition queries. Strong consistency is required to guarantee that when a player earns an achievement, the write is immediately visible to all subsequent reads, which is critical for the gaming scenario.

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.

✗
A. Partition key: PlayerID; Consistency: Eventual
Why it's wrong here
PlayerID is a good partition key for point lookups, but eventual consistency does not guarantee that a write is immediately visible to reads, which violates the requirement.
✓
B. Partition key: PlayerID; Consistency: Strong
Why this is correct
PlayerID makes each player's document a single partition, enabling efficient lookups. Strong consistency ensures that once a write is committed, subsequent reads return the latest data.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
C. Partition key: Achievements; Consistency: Strong
Why it's wrong here
Achievements is an array property; using it as a partition key would create many partitions with unpredictable cardinality and cannot be used for point lookups by PlayerID.
✗
D. Partition key: Email; Consistency: Bounded staleness
Why it's wrong here
Email might be a candidate but could lead to hot partitions if many players share email domains. Bounded staleness is not the strongest consistency level and may not meet the immediate visibility requirement.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse 'most common query' with 'partition key' and pick a non-query column (like Achievements or Email) or choose a weaker consistency level, not realizing that Strong consistency is required for immediate visibility and that PlayerID is the optimal partition key for the lookup pattern.

Detailed technical explanation

How to think about this question

In Azure Cosmos DB, Strong consistency uses a quorum-based replication protocol (similar to Paxos) to ensure that all replicas acknowledge a write before it is committed, guaranteeing linearizability. For single-partition queries with PlayerID as the partition key, the request is routed directly to the partition hosting that player's data, minimizing latency and maximizing throughput. A real-world scenario is a live leaderboard update where a player's achievement must be reflected instantly to prevent disputes or confusion.

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.

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FAQ

Questions learners often ask

What does this DP-900 question test?

Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: B. Partition key: PlayerID; Consistency: Strong — Option B is correct because PlayerID is the natural partition key for the most common query (lookup by PlayerID), ensuring efficient single-partition queries. Strong consistency is required to guarantee that when a player earns an achievement, the write is immediately visible to all subsequent reads, which is critical for the gaming scenario.

What should I do if I get this DP-900 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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