The answer is to create a readable secondary replica. This solution offloads analytical queries to a synchronized, read-only copy of the database, completely isolating heavy reporting workloads from the primary OLTP system. Azure SQL Database supports this through Active Geo-Replication or Hyperscale named replicas, ensuring the primary replica remains unaffected by complex analytical processing. On the DP-203 exam, this scenario tests your understanding of workload isolation patterns, often appearing as a distractor against options like elastic pools or in-memory OLTP. A common trap is choosing a read-scale replica for write-heavy queries—remember, secondary replicas are strictly for read-only operations. Memory tip: think "read-only replica" equals "read-heavy relief" for your primary.
DP-203 Design and implement data storage Practice Question
This DP-203 practice question tests your understanding of design and implement data 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.
A company uses Azure SQL Database for an OLTP application. They need to run complex analytical queries without impacting OLTP performance. Which solution should they implement?
Why wrong: Incorrect. Automatic tuning optimizes query performance but does not offload queries.
B
Enable geo-replication
Why wrong: Incorrect. Geo-replication creates a readable secondary, but it is primarily for disaster recovery, not specifically for analytical queries.
C
Create a readable secondary replica
Correct. A readable secondary replica allows read-only queries without affecting the primary.
D
Create a failover group
Why wrong: Incorrect. Failover groups are for high availability and disaster recovery, not for offloading read queries.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a readable secondary replica
Creating a readable secondary replica (Option C) offloads read-only analytical queries to a synchronized copy of the database, isolating them from the primary OLTP workload. Azure SQL Database supports this via Active Geo-Replication or Hyperscale named replicas, ensuring the primary remains unaffected by heavy analytical processing.
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.
✗
Enable automatic tuning
Why it's wrong here
Incorrect. Automatic tuning optimizes query performance but does not offload queries.
✗
Enable geo-replication
Why it's wrong here
Incorrect. Geo-replication creates a readable secondary, but it is primarily for disaster recovery, not specifically for analytical queries.
✓
Create a readable secondary replica
Why this is correct
Correct. A readable secondary replica allows read-only queries without affecting the primary.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a failover group
Why it's wrong here
Incorrect. Failover groups are for high availability and disaster recovery, not for offloading read queries.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse high-availability features (failover groups, geo-replication) with workload isolation, assuming any replication solves the performance impact, whereas only a dedicated readable secondary explicitly separates read-only analytical traffic from the primary OLTP workload.
Detailed technical explanation
How to think about this question
A readable secondary replica uses transaction log shipping to maintain a near-real-time copy of the database, allowing read-only queries to run without locking or contention on the primary. In Azure SQL Database, this is implemented via Active Geo-Replication (which creates a readable secondary in a different region) or Hyperscale service tier named replicas (which can be in the same region). The secondary replica supports snapshot isolation, ensuring analytical queries see a consistent view without blocking OLTP transactions.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a readable secondary replica — Creating a readable secondary replica (Option C) offloads read-only analytical queries to a synchronized copy of the database, isolating them from the primary OLTP workload. Azure SQL Database supports this via Active Geo-Replication or Hyperscale named replicas, ensuring the primary remains unaffected by heavy analytical processing.
What should I do if I get this DP-203 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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