The correct answer is enabling Query Store to monitor regressions and implementing columnstore indexes to improve analytical query performance. Query Store acts as a built-in flight recorder for your database, capturing query plans and runtime statistics so you can identify performance regressions over time, while columnstore indexes use column-based data storage and batch processing to dramatically accelerate analytical workloads. On the Microsoft Azure Database Administrator Associate DP-300 exam, this question tests your understanding of performance tuning tools specific to Azure SQL Managed Instance, often appearing as a multiple-select item where common traps include confusing Transparent Data Encryption or read-scale replicas with optimization features. Remember that TDE is for security, not speed, and adding more storage alone won’t fix slow queries. A useful memory tip is “Store and Column” — think of Query Store as your performance historian and columnstore indexes as your analytical accelerator.
DP-300 Practice Question: Monitor, configure, and optimize database resources
This DP-300 practice question tests your understanding of monitor, configure, and optimize database resources. 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.
Which TWO options are valid methods to optimize query performance in Azure SQL Managed Instance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use columnstore indexes on large tables
Options B and C are correct. Columnstore indexes (B) improve analytical query performance. Query Store (C) helps identify regressions. Option A is wrong because enabling TDE does not improve performance. Option D is wrong because it increases storage but not performance. Option E is wrong because it's for compatibility, not optimization.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Use columnstore indexes on large tables
Why this is correct
Columnstore indexes improve analytics and large scan queries.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set database compatibility level to 150
Why it's wrong here
Compatibility level affects features, not direct optimization.
✗
Increase the maximum storage size
Why it's wrong here
More storage does not improve query speed.
✓
Enable Query Store and monitor regressions
Why this is correct
Query Store helps find and fix plan regressions.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts data, does not improve query performance.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 DP-300 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use columnstore indexes on large tables — Options B and C are correct. Columnstore indexes (B) improve analytical query performance. Query Store (C) helps identify regressions. Option A is wrong because enabling TDE does not improve performance. Option D is wrong because it increases storage but not performance. Option E is wrong because it's for compatibility, not optimization.
What should I do if I get this DP-300 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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