DP-300 Plan and implement data platform resources Practice Question
A company has an Azure SQL Database with a large table that is frequently updated. They notice performance degradation due to index fragmentation. Which maintenance strategy should you recommend to minimize impact on availability and performance?
⚠ Common exam trap
Watch out — candidates often confuse 'online index reorganize' (which is less impactful but insufficient for high fragmentation) with 'online index rebuild' (which is the correct solution for severe fragmentation), or they assume offline operations are acceptable despite the availability requirement.
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 online index rebuild with resumable operation.
Online index rebuild with resumable operation allows the index to be rebuilt while the table remains available for reads and writes, minimizing downtime. The resumable feature lets you pause and resume the rebuild if it is interrupted, which is critical for large tables that are frequently updated. This approach reduces performance impact compared to offline rebuilds and avoids blocking issues associated with other online methods.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Schedule an offline index rebuild during off-peak hours.
Why it's wrong here
Offline rebuild locks the table, causing downtime.
- ✓
Use online index rebuild with resumable operation.
Why this is correct
Online rebuild allows concurrent access and resumable in case of failure, minimizing impact.
- ✗
Disable and rebuild indexes manually during maintenance window.
Why it's wrong here
Disabling indexes degrades performance and is not a standard maintenance practice.
- ✗
Use online index reorganize with low priority locks.
Why it's wrong here
Reorganize is less effective for high fragmentation and may not fully resolve it.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
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This DP-300 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-300 exam.