Sarp
Why should I use a Sorted Set for a live leaderboard in Redis?
Use a Sorted Set instead of plain string keys sorted in the app, since `ZADD` updates in O(log N) and `ZREVRANGE 0 99` returns the top 100 already ordered.
All questions
Tag
#Redis
Caches, locks, counters and queues with Redis: using in-memory data correctly.
4 answered questions carry this tag.
Polat
Race condition on balance updates: Pessimistic Lock or Redlock?
Keep the invariant in the DB with an atomic `UPDATE ... WHERE balance >= 40` or a `SELECT ... FOR UPDATE`, and save Redlock for non-DB resources.
Murat
How do I build smart rate limiting against distributed brute force and DDoS?
Per-IP limits lose to rotating proxies, so key the Redis sliding-window on account + IP + ASN, add account lockout and leave volumetric floods to the edge.
Cem
How do I prevent a Redis cache stampede (thundering herd) — mutex lock or XFetch?
A single-flight lock plus TTL jitter covers most cases; reach for XFetch only when recompute is truly expensive, and add stale-while-revalidate either way.