FoundationDB
FoundationDB is a free, open-source distributed database that stores structured data as an ordered key-value store across clusters of commodity servers.
What FoundationDB is
FoundationDB is a free, open-source distributed database that stores structured data as an ordered key-value store across clusters of commodity servers. Reads and writes use ACID transactions that can span multiple machines. Applications can use the database directly or connect through stateless layers that add data models, algorithms, or frameworks. It scales by adding machines and manages partitioning, redundancy, and caching; copies of data are replicated across servers, with a replacement location found if a server fails. FoundationDB is optimized for OLTP and can support OLAP through ordered range reads. Its integrated backup system schedules snapshots on a remote file system. Client APIs are available for C, Go, Python, Java, Ruby, and Node.js. TLS supports communication security and authentication, although cluster connections are unencrypted by default. The core has no separate query language, and read/write transactions lasting more than five seconds cannot commit. Linux is described as the best-tested and most performant platform for multi-machine clusters; the macOS server is intended for single-machine development.
Good
- ACID transactions can span multiple machines
- Scales by adding machines
- Integrated scheduled backups to remote file systems
- Client APIs include six languages
Watch out
- Core has no separate query language
- Read/write transactions over five seconds cannot commit
- Cluster connections are unencrypted by default
- macOS server is intended for single-machine development
Who it suits
It suits developers who need a distributed ordered key-value database with multi-machine transactions and can work with its core API or stateless layers. Linux is the stated choice for multi-machine clusters, while macOS server use is intended for single-machine development.
Verdict
FoundationDB offers distributed storage, transactions, replication, and backups for applications built around an ordered key-value store. Its transaction limit, lack of a core query language, and default cluster encryption setting are important design constraints.
The facts
Each one read from FoundationDB's own pages, with the date it was checked.
Where it runs
- Application layers
- Applications can connect directly to FoundationDB, to a layer, or to both; layers are stateless.checked 5 Oct 2026
- Platform caveat
- The macOS server is intended for single-machine development, while Linux is described as the best-tested and most performant platform for multi-machine clusters.checked 4 Oct 2026
What it does
- Backups
- Its integrated backup system creates scheduled moment-in-time snapshots of the distributed database on a remote file system.checked 4 Oct 2026
- Current release
- The documentation identifies version 8.0.0 and says it was last updated on October 2, 2026.checked 5 Oct 2026
- Data models
- Applications can build richer data models on its ordered key-value store using multikey transactions.checked 5 Oct 2026
- Fault testing
- The project says its testing system is based on a deterministic simulation engine.checked 5 Oct 2026
- Fault tolerance
- Data is replicated across multiple servers, and the system automatically finds a new location for a lost copy when a server fails.checked 4 Oct 2026
- Language APIs
- Client APIs are available for Python, Ruby, Node.js, Java, Go, and C.checked 5 Oct 2026
- Language bindings
- Officially supported client bindings are C, Go, Python, Java, and Ruby.checked 4 Oct 2026
- Layers
- Applications can use FoundationDB directly or through stateless layers that add data models, algorithms, or frameworks.checked 4 Oct 2026
- Limit: query language
- The FoundationDB core does not include a separate query language; query languages can be implemented in layers.checked 4 Oct 2026
- Limit: transaction duration
- Read/write transactions lasting over five seconds cannot commit.checked 4 Oct 2026
- Open source
- FoundationDB describes itself as open source and links to community forums and contribution information.checked 5 Oct 2026
- Performance
- The documentation describes FoundationDB as suited to read/write workloads and also performant for write-intensive workloads.checked 5 Oct 2026
- Product
- FoundationDB is a distributed database that stores structured data across clusters of commodity servers as an ordered key-value store.checked 4 Oct 2026
- Reserved keys
- Keys beginning with byte 0xFF are reserved for internal system use and cannot be read or written without the ACCESS_SYSTEM_KEYS transaction option.checked 5 Oct 2026
- Scalability
- FoundationDB scales out by adding machines and automatically handles data redundancy, partitioning, and caching.checked 4 Oct 2026
- Scale and resilience
- Its distributed architecture is designed to scale across clusters of commodity servers and handle hardware failures.checked 5 Oct 2026
- Security
- FoundationDB supports TLS for communication security and authentication, but cluster connections are unencrypted by default.checked 4 Oct 2026
- Support
- The project provides community forums for technical and user discussions.checked 4 Oct 2026
- Transaction limit
- FoundationDB does not support long-running transactions, defined in the documentation as lasting over five seconds.checked 5 Oct 2026
- Transactions
- It provides global ACID transactions with strict serializability using optimistic concurrency.checked 5 Oct 2026
- What it does
- FoundationDB is a distributed database that organizes structured data as an ordered key-value store.checked 5 Oct 2026
The company
- Maker
- The site identifies Apple Inc. as the copyright holder and says FoundationDB is an Apple trademark.checked 5 Oct 2026
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