What is UmaDB?
UmaDB is a specialist open-source event store built for Dynamic Consistency Boundaries.
UmaDB supports event sourcing and event-driven architectures where consistency rules can adapt dynamically to business needs, rather than being hardwired into the database.
UmaDB directly implements the independent specification for Dynamic Consistency Boundaries created by Bastian Waidelich, Sara Pellegrini, and Paul Grimshaw.
UmaDB stores events in an append-only sequence, indexed by monotonically increasing gapless positions, and can be tagged for fast, precise filtering.
UmaDB offers:
- High-performance concurrency with non-blocking reads and writes
- Optimistic concurrency control to prevent simultaneous write conflicts
- Dynamic business-rule enforcement via query-driven append conditions
- Real-time subscriptions with seamless catch-up and continuous delivery
- OSI-approved permissive open-source licenses (MIT and Apache License 2.0)
UmaDB makes new events fully durable before acknowledgements are returned to clients.
Getting Started
Get started with UmaDB by installing and running the umadb binary, or use the Docker image.