A simple, portable, high-performance, ACID, embedded key-value store.
redb is written in pure Rust and is loosely inspired by lmdb. Data is stored in a collection of copy-on-write B-trees. For more details, see the design doc
use redb::{Database, Error, ReadableTable, TableDefinition};
const TABLE: TableDefinition<&str, u64> = TableDefinition::new("my_data");
fn main() -> Result<(), Error> {
let db = Database::create("my_db.redb")?;
let write_txn = db.begin_write()?;
{
let mut table = write_txn.open_table(TABLE)?;
table.insert("my_key", &123)?;
}
write_txn.commit()?;
let read_txn = db.begin_read()?;
let table = read_txn.open_table(TABLE)?;
assert_eq!(table.get("my_key")?.unwrap().value(), 123);
Ok(())
}redb is undergoing active development, and should be considered beta quality. It may eat your data, and does not have any guarantees of file format stability :)
- Zero-copy, thread-safe,
BTreeMapbased API - Fully ACID-compliant transactions
- MVCC support for concurrent readers & writer, without blocking
- Crash-safe by default
- Savepoints and rollbacks
The following features are planned before the 1.0 release
- Stable file format
redb is nearly as fast as lmdb, and faster than sled, on many benchmarks
+--------------------+--------------+------------+--------+---------+---------+
| | redb (1PC+C) | redb (2PC) | lmdb | rocksdb | sled |
+=============================================================================+
| bulk load | 1770ms | 1370ms | 976ms | 5263ms | 4534ms |
|--------------------+--------------+------------+--------+---------+---------|
| individual writes | 227ms | 381ms | 388ms | 701ms | 642ms |
|--------------------+--------------+------------+--------+---------+---------|
| batch writes | 2346ms | 2533ms | 2136ms | 992ms | 1395ms |
|--------------------+--------------+------------+--------+---------+---------|
| large writes | 8805ms | 6532ms | 7793ms | 21475ms | 37736ms |
|--------------------+--------------+------------+--------+---------+---------|
| random reads | 734ms | 734ms | 642ms | 5814ms | 1514ms |
|--------------------+--------------+------------+--------+---------+---------|
| random range reads | 832ms | 834ms | 712ms | 6074ms | 1826ms |
|--------------------+--------------+------------+--------+---------+---------|
| removals | 1281ms | 1149ms | 676ms | 2481ms | 1792ms |
+--------------------+--------------+------------+--------+---------+---------+
Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.