Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
An online retail SaaS uses a single Azure SQL Database (General Purpose, 4 vCores, provisioned). CPU averages 10 percent but surges to 100 percent for six hours at each month-end. Leadership wants to lower overall database costs yet ensure adequate performance during spikes, without manual scaling or code changes. Which Azure SQL purchasing model and compute tier best meet these requirements?
Place the database in a Standard DTU-based elastic pool sized at 50 eDTUs.
Switch to the vCore-based purchasing model with the General Purpose serverless compute tier.
Migrate to Azure SQL Managed Instance in the Business Critical tier with provisioned compute.
Move to the vCore-based Hyperscale service tier with provisioned compute.
The serverless compute tier in the General Purpose vCore-based purchasing model automatically scales CPU and memory within a user-defined range and pauses during idle periods. Billing is per-second for the actual compute used, so the database incurs minimal cost when demand is low and scales up seamlessly when end-of-month demand increases-meeting performance objectives with no manual actions or application changes.
The Hyperscale and Business Critical provisioned tiers run continuously at their configured vCore count, providing no automatic pause and therefore higher steady-state cost. A Standard DTU-based elastic pool also charges for the full eDTU allocation 24Ă—7; to survive a 10Ă— spike it would need to be sized for peak, negating savings. Managed Instance Business Critical is the most expensive option and likewise does not offer serverless scaling.
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Microsoft Azure Solutions Architect Expert AZ-305
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