Redis 2026: Six Production Use Cases Every Developer Should Know

What is Redis?

Redis is an in-memory data store. Data lives in RAM — reads and writes happen in microseconds. 100-1000x faster than disk-based databases for the right use cases.

Use Case 1: Caching

import redis, json
r = redis.Redis(host='localhost', port=6379)

def get_user(user_id):
    cached = r.get(f'user:{user_id}')
    if cached: return json.loads(cached)
    user = db.query('SELECT * FROM users WHERE id = %s', user_id)
    r.setex(f'user:{user_id}', 300, json.dumps(user))
    return user

Use Case 2: Rate Limiting

def is_rate_limited(user_id, limit=100, window=60):
    key = f'ratelimit:{user_id}'
    count = r.incr(key)
    if count == 1: r.expire(key, window)
    return count > limit

Use Cases 3-6

Leaderboards: r.zadd('scores', {'player_A': 1500}); r.zrevrange('scores', 0, 9, withscores=True)

Session Storage: Store with TTL — any app server reads them, scales horizontally.

Pub/Sub Messaging: Publish events, subscribe from other services.

Distributed Locks: r.lock('order_lock', timeout=10) — prevent race conditions across servers.

When NOT to Use Redis

Redis is not a primary database — use alongside PostgreSQL. Data must survive restarts? Persistent database. Data larger than RAM? Disk-based storage. See Redis Academy.