- A
It reduces the total storage required by compressing older partitions.
Why wrong: Partitioning does not automatically compress data. Compression can be applied separately, but it is not the primary benefit of partitioning.
- B
It improves query performance by enabling partition elimination, where only relevant partitions are scanned.
Correct. Partition elimination limits the data scanned, which speeds up queries that filter on the partition key.
- C
It enforces referential integrity between partitions automatically.
Why wrong: Referential integrity is enforced using foreign keys and constraints, not by partitioning. Partitioning does not handle integrity.
- D
It eliminates the need for indexes on the partitioned column.
Why wrong: Indexes are still beneficial for non-partition key filters. Partitioning is not a replacement for indexing.
Quick Answer
The correct answer is that table partitioning improves query performance by enabling partition elimination, where only relevant partitions are scanned. In Azure SQL Database, partitioning divides a large table—like a 500-million-row sales transaction table—into smaller segments based on a partition key such as OrderDate. When a query filters by OrderDate, the database engine intelligently accesses only the partition(s) containing that date range, drastically reducing I/O and scan time instead of reading the entire table. On the DP-900 exam, this concept tests your understanding of performance optimization techniques for large-scale data workloads; a common trap is confusing partitioning with indexing, but remember partitioning physically separates data while indexing organizes it logically. A helpful memory tip: think of a filing cabinet—partitioning is like pulling out only the drawer for a specific year, not opening every drawer to find one file.
DP-900 Practice Question: Identify considerations for relational data on Azure
This DP-900 practice question tests your understanding of identify considerations for 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 retail company uses Azure SQL Database for its sales transaction table, which contains over 500 million rows. Queries that filter by OrderDate are slow because the database scans the entire table. The database administrator decides to implement table partitioning on the OrderDate column. What is the primary benefit of this partitioning strategy?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
It improves query performance by enabling partition elimination, where only relevant partitions are scanned.
Table partitioning in Azure SQL Database divides a large table into smaller, manageable segments based on a partition key (here, OrderDate). The primary benefit is partition elimination: queries with filters on OrderDate can scan only the relevant partition(s) instead of the entire 500-million-row table, drastically reducing I/O and improving query performance.
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.
- ✗
It reduces the total storage required by compressing older partitions.
Why it's wrong here
Partitioning does not automatically compress data. Compression can be applied separately, but it is not the primary benefit of partitioning.
- ✓
It improves query performance by enabling partition elimination, where only relevant partitions are scanned.
Why this is correct
Correct. Partition elimination limits the data scanned, which speeds up queries that filter on the partition key.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It enforces referential integrity between partitions automatically.
Why it's wrong here
Referential integrity is enforced using foreign keys and constraints, not by partitioning. Partitioning does not handle integrity.
- ✗
It eliminates the need for indexes on the partitioned column.
Why it's wrong here
Indexes are still beneficial for non-partition key filters. Partitioning is not a replacement for indexing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse partitioning with indexing or compression, thinking it automatically solves all performance issues or reduces storage, when its core benefit is query performance via partition elimination.
Detailed technical explanation
How to think about this question
Under the hood, Azure SQL Database uses a partition function to map rows to partition boundaries (e.g., monthly ranges) and a partition scheme to place each partition on its own filegroup. Partition elimination occurs at the query optimizer level, which uses the partition key's filter predicate to skip scanning irrelevant partitions. A real-world scenario: a retail company querying last month's sales can avoid scanning years of historical data, reducing query time from minutes to seconds.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DP-900 question test?
Identify considerations for relational data on Azure — This question tests Identify considerations for 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: It improves query performance by enabling partition elimination, where only relevant partitions are scanned. — Table partitioning in Azure SQL Database divides a large table into smaller, manageable segments based on a partition key (here, OrderDate). The primary benefit is partition elimination: queries with filters on OrderDate can scan only the relevant partition(s) instead of the entire 500-million-row table, drastically reducing I/O and improving query performance.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DP-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-900 exam.
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