Compression[03]

Sled supports the ability to use the zstd compression algorithm to compress blobs and snapshots. They have to be decompressed first before processing them during query execution.

Concurrency Control[04]

Currently, Sled does not support transactions and concurrency control is not supported, too. A Cicada style MVCC is planned to be implemented in the future.

Data Model[05]

Sled is a key-value store where keys and values are raw byte strings. It supports atomic single-key operations, including compare and swap operation.

Foreign Keys[02]

Sled does not support foreign key constraints.

Hardware Acceleration[06]

Sled does not use any specialized hardware to accelerate query execution.

Indexes[07]

Currently, Sled only supports Bw-Tree index. Experiments with an Adaptive Radix Tree or Height Optimized Trie index are left as future work.

Isolation Levels[08]

Currently, Sled does not support transactions and no isolation level is supported yet. It is an aim of Sled to support serializable isolation in the future.

Joins[02]

Sled does not support join.

Query Compilation[09]

Sled does not support any form of query compilation.

Query Interface

System Architecture[03]

Sled is an embedded key-value store, which is designed to be used as a construction component in larger stateful systems.

Views[02]

Sled does not support views.