DP-300 Configure and manage automation of tasks Practice Question
You are automating index maintenance for an Azure SQL Database. Which THREE of the following should you consider to minimize performance impact?
⚠ Common exam trap
It's easy for candidates to assume SORT_IN_TEMPDB = ON always improves performance, but in Azure SQL Database it can increase tempdb contention, and MAXDOP = 0 is mistakenly thought to be optimal for maintenance tasks when it actually risks resource starvation.
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 the ONLINE = ON option when rebuilding indexes.
Using ONLINE = ON when rebuilding indexes in Azure SQL Database allows concurrent user access to the underlying table during the index rebuild operation. This minimizes blocking and performance impact on production workloads, as the index rebuild is performed as a series of short-term locks rather than a single long-term schema modification lock.
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 the ONLINE = ON option when rebuilding indexes.
Why this is correct
Allows concurrent access.
- ✗
Always use SORT_IN_TEMPDB = ON to reduce tempdb contention.
Why it's wrong here
SORT_IN_TEMPDB may increase tempdb load.
- ✗
Set MAXDOP to 0 to use all CPUs for faster execution.
Why it's wrong here
Using all CPUs can starve other workloads.
- ✓
Reorganize indexes with fragmentation below 30% instead of rebuilding.
Why this is correct
Reorganize is less impactful.
- ✓
Use a fill factor of 70-80% for indexes with frequent insert/update operations.
Why this is correct
Reduces page splits.
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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