Redis

CLI Basics

Connect

Ping

Info

Strings

Set/get

With expiration

Set if not exists

Increment/decrement

Multiple

Hashes

Set fields

Get

Increment field

Check existence

Delete field

Lists

Push

Pop

Range

Length

Trim (keep only range)

Sets

Add/remove

Check membership

All members

Count

Operations

Random

Sorted Sets

Add with score

Get by rank

Get by score

Rank

Increment score

Count in range

Key Management

Find keys

Expiration

Delete

Type

Exists

Pub/Sub

Subscribe

Pattern subscribe

Publish

Unsubscribe

Common Patterns

Caching

Cache-aside pattern

1. Check cache

2. If miss, query DB, then set cache

Rate Limiting

Sliding window rate limit

Using sorted set with timestamp scores

If count > limit, reject

Session Store

Distributed Lock

Acquire lock

NX = only if not exists, EX = auto-expire

Release lock (use Lua for atomicity)

Configuration

Max memory

Eviction policies:

noeviction - Return error on write when full

allkeys-lru - Evict least recently used

allkeys-lfu - Evict least frequently used

volatile-lru - LRU among keys with TTL

volatile-ttl - Evict shortest TTL first

Persistence

View config

Reference