Apa itu Redis?

Redis (Remote Dictionary Server) adalah in-memory key-value store yang sangat cepat. Data disimpan di RAM sehingga akses dalam mikrodetik.

Use Cases Redis

• Caching — simpan hasil query database yang sering diakses
• Session storage — simpan session user
• Rate limiting — batasi request per waktu
• Queue — antrian job/task
• Real-time — leaderboard, counter, pub/sub

Data Structures di Redis

-- String (key-value sederhana)
SET user:1:name "Budi"
GET user:1:name              -- "Budi"
SET page:home:views 0
INCR page:home:views         -- 1 (atomic increment)

-- Hash (object/map)
HSET user:1 name "Budi" email "[email protected]" age 25
HGET user:1 name             -- "Budi"
HGETALL user:1               -- semua field

-- List (ordered, bisa push/pop)
LPUSH notifications:1 "Pesan baru"
LPUSH notifications:1 "Order dikirim"
LRANGE notifications:1 0 -1  -- semua notifikasi

-- Set (unique, unordered)
SADD user:1:roles "admin" "editor"
SISMEMBER user:1:roles "admin"  -- true

-- Sorted Set (ranked)
ZADD leaderboard 100 "Budi" 85 "Siti" 92 "Andi"
ZREVRANGE leaderboard 0 2   -- top 3 tertinggi

TTL (Time To Live)

-- Set data dengan expiry otomatis
SET cache:products "[...]" EX 3600  -- expire dalam 1 jam
SETEX otp:08123 300 "123456"        -- OTP expire 5 menit

TTL cache:products                   -- sisa waktu dalam detik

Redis di Laravel

// Caching
Cache::put('popular_products', $products, 3600);
$products = Cache::get('popular_products');

// Rate limiting
RateLimiter::attempt('send-otp:' . $user->id, 3, function () {
    // kirim OTP
}, 60); // max 3x per 60 detik