Welcome back! In this lesson, we’ll explore a crucial feature of Redis: key expiration. This feature allows you to manage data efficiently by automatically removing keys after a specified duration. Key expiration is particularly useful for applications like caching, session management, and handling temporary data.

Redis key expiration ensures that specific keys are removed from the database after a given time. This helps optimize memory usage and eliminates the need for manual cleanup of outdated data. Key expiration is ideal for scenarios such as:

• Caching: Automatically removing stale cache entries.
• Session Management: Ensuring user sessions expire after a specific time.
• Temporary Data: Managing one-time tokens or expiring notifications.

In this lesson, we’ll explore the commands SETEX, TTL, and EXPIRE to effectively manage key expiration.

The SETEX command is used to create a key with a value and an expiration time in seconds. This ensures the key automatically expires after the specified duration.

Here, the key session:12345 is set with the value and a time-to-live of 2 seconds.