DP-300 Practice Question: Monitor, configure, and optimize database resources
You are monitoring an Azure SQL Database that hosts a financial application. You notice that the average DTU consumption is 20%, but occasionally spikes to 95% for 5-minute intervals. Users report slow response times during these spikes. You need to ensure consistent performance without over-provisioning resources. What should you do?
⚠ Common exam trap
Many exam-takers assume spikes always require scaling up (Option B) or migrating to a higher tier (Option A), but the DP-300 exam emphasizes that optimization and scheduling are often more cost-effective than over-provisioning.
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
✓
Identify and optimize the queries running during the spike periods, possibly rescheduling a heavy ETL job.
The issue is not a consistent resource shortage but periodic spikes caused by specific queries, likely from a heavy ETL job. By identifying and optimizing those queries or rescheduling the job, you can eliminate the spikes without permanently scaling up resources, which would waste cost and capacity. This aligns with the DP-300 focus on performance tuning and resource optimization rather than blind scaling.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Migrate the database to the Hyperscale service tier.
Why it's wrong here
Hyperscale raises storage and read-replica ceilings, not the compute ceiling that DTU spikes hit; the 95% bursts stem from CPU or log throughput, which Hyperscale does not smooth. It is tempting because Hyperscale suits rapidly growing databases needing fast restore and large storage, not intermittent five-minute compute peaks.
- ✗
Scale the database to a higher service tier to absorb the spikes.
Why it's wrong here
Raising the service tier lifts the fixed DTU ceiling permanently, so the 20% average is paid for continuously to cover rare bursts — over-provisioning. It is tempting because scaling up genuinely fixes sustained high utilisation, but here the correct approach is elastic scaling that adjusts capacity only during spikes.
- ✗
Enable Query Store and use the Regressed Queries feature to find slow queries.
Why it's wrong here
Query Store records execution statistics for later analysis; it neither absorbs the five-minute DTU bursts nor prevents user-visible slowdowns while they occur. It is tempting because Regressed Queries is the right tool when a specific query's plan changed and caused sustained degradation, not transient resource spikes.
- ✓
Identify and optimize the queries running during the spike periods, possibly rescheduling a heavy ETL job.
Why this is correct
The intermittent 95% spikes with a 20% baseline indicate workload-driven contention, not insufficient capacity. Tuning the offending queries and rescheduling the heavy ETL job removes the burst at source, avoiding the cost of scaling up for brief peaks.
Go deeper
Related to this question
Learn chapter
Managing Environment Configurations and Resource Governance
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.
Key term
Azure SQL Authentication
Azure SQL Authentication is the process of verifying a user's identity to access an Azure SQL database using either a username and password (SQL Authentication) or a Microsoft Entra ID (formerly Azure AD) identity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.