3 Redis interview QA (2025 Edition) | 2025-09-12 03:53 PM
📘 Neulax - Redis Interview Prep
This video contains 3 Redis interview questions with answers.
📝 Questions & Answers:
Q1: What monitoring metrics should you watch for Redis?
A1: Key metrics: memory usage, evictions, hit/miss ratio, latency, ops/sec, connected clients, replication lag, and persistence timings. Example: Like monitoring room temperature, board usage, and how quickly people can read/write to identify bottlenecks.
Q2: What is pub/sub in Redis?
A2: Pub/Sub is a lightweight messaging pattern where publishers send messages to channels and subscribers receive them in real-time. Example: Like a broadcast speaker system where announcers publish messages and listeners tuned to channels hear them instantly.
Q3: What is a hash slot (in Redis Cluster)?
A3: Redis Cluster uses 16,384 hash slots to map keys to particular nodes for consistent distribution. Example: Like numbering sections of a circular chart and assigning each number range to a room.
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