sled

A modern embedded database. Written in Rust, usable on servers and phones from any C-compatible language.

let db = sled::open(path)?; // as in fs::open
db.insert(k, v)?;           // as in BTreeMap::insert
db.get(&k)?;                // as in BTreeMap::get
for kv in db.range(k..) {}  // as in BTreeMap::range
db.remove(&k)?;             // as in BTreeMap::remove
drop(db);                   // fsync and close file

Embedded databases are useful in several cases:

you want to store data on disk, without facing the complexity of files
you want to be simple, without operating an external database
you want to be fast, without paying network costs
using disk storage as a building block in your system

sled features

API similar to a threadsafe BTreeMap<[u8], [u8]>
fully serializable multi-key and multi-Tree transactions
fully atomic single-key operations, including compare and swap and update and fetch
zero-copy reads
write batch support
subscription/watch semantics on key prefixes
multiple keyspaces
merge operators
forward and reverse iterators
a crash-safe monotonic ID generator capable of generating over 100 million unique ID’s per second
zstd compression (use the compression build feature)
cpu-scalable lock-free implementation
SSD-optimized log-structured storage
prefix encoded and suffix truncated keys reducing the storage cost of complex keys

sled

sled features

references