Memory usage analysis (INFO memory) in Redis - Mini Project: Build & Apply

Memory Usage Analysis with Redis INFO Memory

📖 Scenario: You are managing a Redis server that stores session data for a web application. To keep the server running smoothly, you need to check how much memory Redis is using and understand the memory details.

🎯 Goal: Learn how to use the Redis INFO memory command to get memory usage details and analyze the output.

📋 What You'll Learn

Use the Redis command INFO memory to get memory statistics

Store the output in a variable called memory_info

Extract the used_memory value from memory_info

Extract the maxmemory value from memory_info

💡 Why This Matters

🌍 Real World

Monitoring Redis memory usage helps prevent crashes and optimize performance in real applications like caching and session storage.

💼 Career

Understanding Redis memory info is important for roles like backend developers, DevOps engineers, and system administrators managing Redis servers.

1

Connect to Redis and get memory info

Write a Redis command to get memory information using INFO memory and store the result in a variable called memory_info.

Redis

# Use the Redis command INFO memory and store it in memory_info
# Your code here

Need a hint?

Use execute_command('INFO', 'memory') on your Redis client to get memory info.

2

Extract used_memory from memory_info

Add code to extract the used_memory value from the memory_info string and store it in a variable called used_memory. The value is after the line starting with used_memory:.

Redis

memory_info = redis_client.execute_command('INFO', 'memory')
# Extract used_memory value from memory_info
# Your code here

Need a hint?

Split memory_info by lines and find the line starting with used_memory:. Then split by ':' and convert the second part to an integer.

3

Extract maxmemory from memory_info

Add code to extract the maxmemory value from the memory_info string and store it in a variable called maxmemory. The value is after the line starting with maxmemory:.

Redis

memory_info = redis_client.execute_command('INFO', 'memory')
used_memory = None
for line in memory_info.splitlines():
    if line.startswith('used_memory:'):
        used_memory = int(line.split(':')[1])
        break
# Extract maxmemory value from memory_info
# Your code here

Need a hint?

Use a similar approach as for used_memory to find and convert maxmemory.

4

Check if maxmemory is set and finalize

Add code to check if maxmemory is zero, which means no max memory limit is set. Store the result as a boolean in a variable called is_maxmemory_set. It should be False if maxmemory is 0, otherwise True.

Redis

memory_info = redis_client.execute_command('INFO', 'memory')
used_memory = None
maxmemory = None
for line in memory_info.splitlines():
    if line.startswith('used_memory:'):
        used_memory = int(line.split(':')[1])
    elif line.startswith('maxmemory:'):
        maxmemory = int(line.split(':')[1])
    if used_memory is not None and maxmemory is not None:
        break
# Check if maxmemory is set and store in is_maxmemory_set
# Your code here

Need a hint?

Compare maxmemory to zero and assign the boolean result to is_maxmemory_set.