EXEC to execute in Redis - Mini Project: Build & Apply

Using Redis EXEC to Execute Transactions

📖 Scenario: You are managing a simple Redis database for a small online store. You want to update the stock quantities of two products together to keep the data consistent.

🎯 Goal: Build a Redis transaction using MULTI and EXEC commands to update the stock of two products atomically.

📋 What You'll Learn

Create two keys with initial stock values

Start a transaction with MULTI

Queue two DECRBY commands to reduce stock

Execute the transaction with EXEC

💡 Why This Matters

🌍 Real World

Redis transactions help keep data consistent when multiple related changes must happen together, like updating stock levels in an online store.

💼 Career

Understanding Redis transactions is useful for backend developers and database administrators working with caching and real-time data stores.

1

DATA SETUP: Create initial stock keys

Create two Redis keys called product:1001:stock and product:1002:stock with values 50 and 30 respectively using the SET command.

Redis

# Your Redis commands here

Need a hint?

Use the SET command to assign values to keys.

2

CONFIGURATION: Start the transaction

Start a Redis transaction by issuing the MULTI command.

Redis

SET product:1001:stock 50
SET product:1002:stock 30
# Start the transaction with MULTI

Need a hint?

Use MULTI to begin queuing commands for a transaction.

3

CORE LOGIC: Queue stock decrement commands

Queue two DECRBY commands inside the transaction to reduce product:1001:stock by 5 and product:1002:stock by 3.

Redis

SET product:1001:stock 50
SET product:1002:stock 30
MULTI
# Queue DECRBY commands here

Need a hint?

Use DECRBY key amount to decrease stock values inside the transaction.

4

COMPLETION: Execute the transaction

Execute all queued commands atomically by issuing the EXEC command.

Redis

SET product:1001:stock 50
SET product:1002:stock 30
MULTI
DECRBY product:1001:stock 5
DECRBY product:1002:stock 3
# Execute the transaction with EXEC

Need a hint?

Use EXEC to run all queued commands in the transaction.