Storage tiers (Hot, Cool, Archive) in Azure - Step-by-Step Execution

Process Flow - Storage tiers (Hot, Cool, Archive)

Data arrives

↓

Choose storage tier

↓

Hot

↓

Fast access

↓

Higher cost

↓

Data stored accordingly

Data is stored in one of three tiers based on how often it is accessed: Hot for frequent use, Cool for less frequent, and Archive for rare access.

Execution Sample

Azure

storageTier = 'Hot'
if dataAccessFrequency == 'daily':
  storageTier = 'Hot'
elif dataAccessFrequency in ['weekly', 'monthly']:
  storageTier = 'Cool'
else:
  storageTier = 'Archive'

This code decides which storage tier to use based on data access frequency, grouping weekly and monthly as 'Cool'.

Process Table

Step	Data Access Frequency	Condition Checked	Storage Tier Set	Cost Implication
1	Daily	dataAccessFrequency == 'daily'? Yes	Hot	Higher cost, fastest access
2	Weekly	daily? No; weekly/monthly? Yes	Cool	Lower cost, slower access
3	Yearly	daily? No; weekly/monthly? No	Archive	Lowest cost, slowest access
4	Monthly	daily? No; weekly/monthly? Yes	Cool	Lower cost, slower access
5	Never	daily? No; weekly/monthly? No	Archive	Lowest cost, slowest access

💡 Storage tier chosen based on access frequency conditions.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5
storageTier	undefined	Hot	Cool	Archive	Cool	Archive
dataAccessFrequency	undefined	Daily	Weekly	Yearly	Monthly	Never

Key Moments - 2 Insights

Why is 'Cool' tier chosen for monthly access instead of 'Hot'?

Because the condition checks if access is daily first; monthly access fails daily check but passes weekly/monthly check, so 'Cool' tier is selected as shown in execution_table row 4.

Why does 'Archive' tier have the lowest cost but slowest access?

'Archive' is designed for rarely accessed data, so it stores data cheaply but retrieval takes longer, as indicated in the cost implication column of execution_table rows 3 and 5.

Visual Quiz - 3 Questions

Look at the execution_table, what storage tier is set when data is accessed weekly?

A Cool

B Archive

C Hot

D None

💡 Hint

Check row 2 in execution_table where data access frequency is Weekly.

At which step does the condition for weekly/monthly become true for monthly access?

A Step 1

B Step 2

C Step 4

D Step 3

💡 Hint

Look at execution_table rows where monthly access is checked and condition is true.

If data access changes from yearly to daily, how does storageTier change according to variable_tracker?

A From Cool to Archive

B From Archive to Hot

C From Hot to Cool

D No change

💡 Hint

Compare storageTier values for Yearly and Daily in variable_tracker.

Concept Snapshot

Storage tiers in Azure:
- Hot: frequent access, highest cost, fastest
- Cool: infrequent access (weekly/monthly), lower cost, slower
- Archive: rare access, lowest cost, slowest
Choose tier based on data access frequency
Switch tiers to optimize cost and performance

Full Transcript

This lesson shows how Azure storage tiers work by choosing Hot, Cool, or Archive based on how often data is accessed. Hot tier is for daily access with higher cost but fast retrieval. Cool tier is for weekly or monthly access with lower cost and slower retrieval. Archive tier is for rarely accessed data with lowest cost but slowest retrieval. The execution table traces decisions step-by-step for different access frequencies. Variable tracker shows how storageTier changes with dataAccessFrequency. Key moments clarify why monthly access uses Cool tier and why Archive is cheapest but slowest. The quiz tests understanding of tier selection and condition checks.