Question 765 of 919
DP-300 Practice Question: Monitor, configure, and optimize database resources
Which TWO options are valid methods to optimize query performance in Azure SQL Managed Instance?
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
✓
Use columnstore indexes on large tables
Options A and D are correct. Columnstore indexes (A) improve analytical query performance by reducing I/O and using batch processing. Query Store (D) helps identify regressions by tracking execution plans and performance metrics. Option B is incorrect; setting database compatibility level to 150 may enable new features but is not a direct query optimization method. Option C is incorrect; increasing storage size does not improve query performance. Option E is incorrect; Transparent Data Encryption (TDE) secures data but does not enhance performance.
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.
- ✗
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.
- ✗
Enable Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts data, does not improve query performance.
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Last reviewed: Jun 21, 2026
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