SET with expiry (EX, PX) in Redis - Mini Project: Build & Apply

Using Redis SET Command with Expiry (EX, PX)

📖 Scenario: You are managing a simple cache system for a website. You want to store user session tokens in Redis with an expiration time so that sessions automatically expire after some time.

🎯 Goal: Learn how to use the Redis SET command with expiration options EX (seconds) and PX (milliseconds) to store keys that expire automatically.

📋 What You'll Learn

Create a Redis key-value pair for a user session token

Set the key to expire after a certain number of seconds using EX

Set another key to expire after a certain number of milliseconds using PX

Verify the correct syntax for the SET command with expiry options

💡 Why This Matters

🌍 Real World

Web applications often store session tokens or cache data in Redis with expiry to automatically remove stale data.

💼 Career

Knowing how to set keys with expiry in Redis is essential for backend developers and DevOps engineers managing scalable, performant applications.

1

Create a Redis key for a user session token

Use the Redis SET command to create a key called session:user123 with the value token_abc123.

Redis

# Your Redis command here to set the session key

Need a hint?

Use SET key value to store a key-value pair in Redis.

2

Add expiry in seconds using EX option

Modify the SET command to set the key session:user123 with value token_abc123 to expire after 300 seconds using the EX option.

Redis

SET session:user123 token_abc123 EX 300  # Add expiry in seconds

Need a hint?

Use EX seconds after the value to set expiry in seconds.

3

Create another key with expiry in milliseconds using PX option

Use the Redis SET command to create a key called session:user456 with value token_xyz789 that expires after 15000 milliseconds using the PX option.

Redis

SET session:user456 token_xyz789 PX 15000  # Set expiry in milliseconds

Need a hint?

Use PX milliseconds after the value to set expiry in milliseconds.

4

Complete the Redis commands with expiry options

Ensure both keys session:user123 and session:user456 are set with their respective expiry options using the SET command with EX and PX.

Redis

# Confirm both SET commands with expiry options are present

Need a hint?

Both commands should include the expiry options exactly as shown.