Strings

Redis · Reference cheat sheet

Strings

Redis · Reference cheat sheet

📋 Overview

Strings are the simplest Redis values: text, integers (for counters), or binary blobs (up to 512 MB theoretically; keep small in practice).

🔧 Core concepts

Command	Role
`SET key value`	Set string
`GET key`	Get string
`MSET` / `MGET`	Multi set/get
`SETNX`	Set if not exists
`INCR` / `DECR`	Integer increment
`APPEND`	Append to string
`GETRANGE` / `SETRANGE`	Substring ops
`SET key value EX seconds`	Set with TTL

Option	Meaning
`EX` / `PX`	Expire seconds / ms
`NX` / `XX`	Only if missing / only if exists
`GET` (SET GET)	Return old value (Redis 6.2+)

💡 Examples

Cache entry:

SET user:42:profile '{"name":"Ada"}' EX 3600
GET user:42:profile

Counter:

INCR page:home:views
GET page:home:views

Lock-style NX:

SET lock:job1 1 NX EX 30

⚠️ Pitfalls

INCR fails if the value is not an integer string.
Huge strings block peers longer during ops — split or use other structures.
KEYS * in production is dangerous — use SCAN.

Sorted Sets

Redis · Reference cheat sheet

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Strings 📋 Overview 🔧 Core concepts 💡 Examples ⚠️ Pitfalls 🔗 Related