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Lua Academy · Lesson

EVAL and Redis Lua Environment

Execute Lua scripts with EVAL, understand KEYS/ARGV, and script caching.

Why Lua in Redis?

Redis allows running Lua scripts inside the server with EVAL. Scripts execute atomically — no other Redis command runs concurrently, enabling safe multi-step operations.

EVAL Command

EVAL script numkeys key [key ...] arg [arg ...] — the script accesses keys via KEYS table and arguments via ARGV table (1-indexed).

-- Redis CLI:
EVAL "return KEYS[1]" 1 mykey
-- Returns: mykey

All lessons in this course

  1. EVAL and Redis Lua Environment
  2. Atomic Operations and Transactions
  3. Rate Limiting with Lua
  4. SCRIPT LOAD and EVALSHA
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