redb

Spec sheet

Product

redb is a portable, high-performance embedded key-value store written in pure Rust.Read 8 Oct 2026 · docs.rs

API

Its API is zero-copy, thread-safe, and based on BTreeMap.Read 8 Oct 2026 · docs.rs

License

The repository lists Apache-2.0 and MIT licenses.Read 8 Oct 2026 · github.com

Maker

The project homepage credits Christopher Berner.Read 7 Oct 2026 · redb.org

Concurrency

MVCC allows concurrent readers and a writer without blocking.Read 8 Oct 2026 · docs.rs

Data structure

It stores data in a collection of copy-on-write B+trees.Read 8 Oct 2026 · docs.rs

Documentation

The project links to its Rust API documentation on docs.rs.Read 7 Oct 2026 · redb.org

No standard library

With the std feature disabled and experimental-api-5 enabled, redb can build without the standard library; this mode requires alloc, panic = "abort", and a target with atomic compare-and-swap.Read 7 Oct 2026 · github.com

No standard library mode

With experimental-api-5 enabled, redb can be built without std; this mode requires alloc, panic = abort, and a target with atomic compare-and-swap.Read 8 Oct 2026 · github.com

No standard library storage

In no_std mode there is no filesystem, so storage must be supplied by implementing StorageBackend.Read 7 Oct 2026 · github.com

Recovery

The project describes redb as crash-safe by default.Read 8 Oct 2026 · docs.rs

Release status

The project describes redb as stable and maintained, with a stable file format.Read 8 Oct 2026 · github.com

Savepoints

It supports savepoints and rollbacks.Read 8 Oct 2026 · docs.rs

Status

The project says redb is stable and maintained, and that its file format is stable.Read 7 Oct 2026 · github.com

Storage

Data is stored in a collection of copy-on-write B+trees.Read 7 Oct 2026 · docs.rs

Storage backend

In no_std mode, storage is supplied by implementing StorageBackend and passing it to Builder::create_with_backend().Read 8 Oct 2026 · github.com

Transactions

redb supports fully ACID-compliant transactions.Read 8 Oct 2026 · docs.rs

Where Specifiction places it

• Embedded Databases#27 of 306.4