Redis Caching Strategies

Redis Data Structures

• String: Text, numbers, binary data
• List: Ordered collection
• Hash: Key-value pairs for objects
• Set: Unique unordered elements
• Sorted Set: Ordered with scores

Cache-Aside Pattern

async function getUser(id) {
  let user = await redis.get('user:' + id)
  if (user) return JSON.parse(user)
  user = await db.query(...)
  await redis.setex('user:' + id, 3600, JSON.stringify(user))
  return user
}

Common Issues

• Cache Penetration: Cache null values
• Cache Avalanche: Add random TTL
• Cache Breakdown: Use mutex locks