A high-performance, DynamoDB-compatible database server written in Odin, backed by RocksDB.
DynamoDB-Compatible Database · Powered by RocksDB + Odin

What is JormunDB?

JormunDB (formerly ZynamoDB) is a Self-Hosted DynamoDB replacement that speaks the DynamoDB wire protocol. Point your AWS SDK or CLI at it and use it as a drop-in replacement.

Why Odin? The original Zig implementation suffered from explicit allocator threading—every function taking an allocator parameter, every allocation needing errdefer cleanup. Odin's implicit context allocator system eliminates this ceremony: one context.allocator = arena_allocator at the request handler entry and everything downstream just works.

Features

✅ DynamoDB Wire Protocol: Works with AWS SDKs and CLI out of the box
✅ Binary Storage: Efficient TLV encoding for items, varint-prefixed keys
✅ Arena-per-Request: Zero explicit memory management in business logic
✅ Table Operations: CreateTable, DeleteTable, DescribeTable, ListTables
✅ Item Operations: PutItem, GetItem, DeleteItem
✅ Query & Scan: With pagination support (Limit, ExclusiveStartKey)
✅ Expression Parsing: KeyConditionExpression for Query operations
✅ Persistent Storage: RocksDB-backed with full ACID guarantees
✅ Concurrency: Table-level RW locks for safe concurrent access

Languages

Odin 96%

Makefile 1.6%

C++ 1.3%

Shell 0.6%

C 0.5%