Function pricing (consumption vs premium) in Azure - Visual Side-by-Side Comparison

Process Flow - Function pricing (consumption vs premium)

Start: Choose Function App

↓

Select Pricing Plan

↓

Consumption Plan

↓

Pay per execution & resource use

↓

Auto scale with demand

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Premium Plan

↓

Pay fixed + per execution

↓

Always warm instances

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Scale based on pre-warmed capacity

This flow shows choosing between Consumption and Premium plans for Azure Functions, highlighting cost and scaling differences.

Execution Sample

Azure

Choose plan: Consumption or Premium
If Consumption:
  Pay per execution
  Auto scale
If Premium:
  Pay fixed + execution
  Always warm
  Scale with pre-warmed instances

This pseudo-code shows decision and behavior differences between Consumption and Premium plans.

Process Table

Step	Plan Selected	Cost Model	Scaling Behavior	Instance Warmth
1	Consumption	Pay per execution and resource use	Auto scale instantly with demand	Cold start possible
2	Premium	Fixed cost + pay per execution	Scale with pre-warmed instances	Always warm, no cold start
3	Consumption	Cost depends on executions and memory used	Scale down to zero when idle	Cold start on new requests
4	Premium	Higher base cost but better performance	Scale faster with pre-allocated instances	No cold start, better latency
5	End	-	-	-

💡 Comparison ends after showing cost and scaling differences for both plans.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
Plan Selected	None	Consumption	Premium	Consumption	Premium	Comparison complete
Cost Model	None	Pay per execution	Fixed + pay per execution	Pay per execution	Fixed + pay per execution	Shown
Scaling Behavior	None	Auto scale	Scale with pre-warmed	Auto scale	Scale with pre-warmed	Shown
Instance Warmth	None	Cold start possible	Always warm	Cold start possible	Always warm	Shown

Key Moments - 3 Insights

Why does the Consumption plan sometimes cause delays when starting functions?

Because Consumption plan instances can be cold (not running) and need to start on demand, causing cold starts as shown in execution_table rows 1 and 3.

Why does the Premium plan cost more even if you have few executions?

Premium plan has a fixed base cost for always warm instances plus execution costs, so you pay even if usage is low, as shown in execution_table rows 2 and 4.

How does scaling differ between Consumption and Premium plans?

Consumption scales instantly but can scale down to zero causing cold starts; Premium scales with pre-warmed instances avoiding cold starts, as shown in execution_table rows 1,2,3,4.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does the Premium plan show 'Always warm' instances?

A Step 2

B Step 1

C Step 3

D Step 4

💡 Hint

Check the 'Instance Warmth' column in execution_table rows for Premium plan.

According to variable_tracker, what is the 'Cost Model' after Step 3 for the Consumption plan?

A Fixed cost plus execution

B Pay per execution and resource use

C No cost

D Fixed monthly fee

💡 Hint

Look at 'Cost Model' row under 'After Step 3' in variable_tracker.

If you want to avoid cold starts, which plan should you choose based on the execution_table?

A Consumption plan

B Either plan works the same

C Premium plan

D Neither plan avoids cold starts

💡 Hint

Check 'Instance Warmth' column for both plans in execution_table.

Concept Snapshot

Azure Functions Pricing Plans:
- Consumption: pay per execution, auto scale, possible cold starts
- Premium: fixed + execution cost, always warm, faster scale
- Choose Consumption for cost savings with variable load
- Choose Premium for predictable performance and no cold starts

Full Transcript

This visual execution compares Azure Functions pricing plans: Consumption and Premium. The flow starts by selecting a plan, then shows cost and scaling differences. Consumption plan charges per execution and scales automatically but may have cold starts. Premium plan has a fixed base cost plus execution charges, keeps instances always warm, and scales with pre-warmed capacity to avoid cold starts. The execution table traces these differences step-by-step. Variable tracker shows how plan selection affects cost model, scaling, and instance warmth. Key moments clarify why cold starts happen in Consumption and why Premium costs more but performs better. The quiz tests understanding of these concepts referencing the tables. The snapshot summarizes key points for quick recall.