Memory-efficient data structures in Redis - Mini Project: Build & Apply

Memory-efficient Data Structures in Redis

📖 Scenario: You are managing a small online store's inventory using Redis. To save memory, you want to use Redis data structures that store data efficiently.

🎯 Goal: Build a Redis setup that uses memory-efficient data structures to store product information and stock counts.

📋 What You'll Learn

Create a Redis hash to store product names

Create a Redis sorted set to store product stock counts with product IDs as members

Set a threshold variable to identify low stock products

Write a Redis command to retrieve products with stock below the threshold

💡 Why This Matters

🌍 Real World

Many applications use Redis to store and query data quickly while saving memory, such as inventory systems, leaderboards, and session stores.

💼 Career

Understanding Redis data structures and commands is valuable for backend developers, DevOps engineers, and anyone working with fast, scalable data storage.

1

Create a Redis hash for products

Create a Redis hash called products with these exact entries: p1 with value "Apple", p2 with value "Banana", and p3 with value "Cherry".

Redis

# Your Redis commands here
# Use HSET to create the hash 'products' with the specified entries

Need a hint?

Use the HSET command to add multiple fields and values to the hash products.

2

Create a Redis sorted set for stock counts

Create a Redis sorted set called stock with these exact members and scores: member p1 with score 50, member p2 with score 20, and member p3 with score 5.

Redis

HSET products p1 "Apple" p2 "Banana" p3 "Cherry"
# Your Redis command here
# Use ZADD to create the sorted set 'stock' with the specified members and scores

Need a hint?

Use the ZADD command to add members with scores to the sorted set stock.

3

Set a low stock threshold

Create a Redis string key called low_stock_threshold and set its value to 10.

Redis

HSET products p1 "Apple" p2 "Banana" p3 "Cherry"
ZADD stock 50 p1 20 p2 5 p3
# Your Redis command here
# Use SET to create 'low_stock_threshold' with value 10

Need a hint?

Use the SET command to create a simple key-value pair for the threshold.

4

Retrieve products with low stock

Write a Redis command to get all members from the stock sorted set with scores less than the value stored in low_stock_threshold. Use ZREVRANGEBYSCORE or ZRANGEBYSCORE with the correct parameters.

Redis

HSET products p1 "Apple" p2 "Banana" p3 "Cherry"
ZADD stock 50 p1 20 p2 5 p3
SET low_stock_threshold 10
# Your Redis command here
# Use ZRANGEBYSCORE to get members with score less than low_stock_threshold

Need a hint?

Use ZRANGEBYSCORE stock -inf (10 to get members with scores less than 10.