KahaDB vs KurrentDB (EventStoreDB)
KahaDB: Apache ActiveMQ Classic's built-in journal-plus-B-tree message store; a persistence engine, not a general DB. KurrentDB (EventStoreDB): A purpose-built event store for event sourcing, with streams, subscriptions and projections.
key differences
- KahaDB is primarily a key-value database; KurrentDB (EventStoreDB) is event store.
- Licensing: KahaDB is open source (permissive) (Apache License 2.0); KurrentDB (EventStoreDB) is source-available (Kurrent License v1 (KLv1)).
- KurrentDB (EventStoreDB) is built for larger datasets (≤ 10 TB) than KahaDB (≤ 100 GB).
- Only KurrentDB (EventStoreDB) has json, change data capture, pub/sub, encryption at rest, role-based access.
- KahaDB can run embedded in your application process.
choose kahadb for
- +Durable message persistence for ActiveMQ Classic brokers
- +Example of a journal plus B-tree index storage design
best at · Queue, Embedded
choose kurrentdb for
- +Event-sourced domain models with CQRS
- +Audit-heavy financial and logistics systems
- +Integrating microservices via durable event streams
best at · Event sourcing, OLTP, Pub/Sub
KahaDB vs KurrentDB (EventStoreDB): FAQ
What is the difference between KahaDB and KurrentDB (EventStoreDB)?
KahaDB: Apache ActiveMQ Classic's built-in journal-plus-B-tree message store; a persistence engine, not a general DB. KurrentDB (EventStoreDB): A purpose-built event store for event sourcing, with streams, subscriptions and projections. KahaDB is primarily a key-value database; KurrentDB (EventStoreDB) is event store. Licensing: KahaDB is open source (permissive) (Apache License 2.0); KurrentDB (EventStoreDB) is source-available (Kurrent License v1 (KLv1)). KurrentDB (EventStoreDB) is built for larger datasets (≤ 10 TB) than KahaDB (≤ 100 GB).
When should I choose KahaDB over KurrentDB (EventStoreDB)?
Choose KahaDB for durable message persistence for ActiveMQ Classic brokers and example of a journal plus B-tree index storage design. Choose KurrentDB (EventStoreDB) for event-sourced domain models with CQRS; audit-heavy financial and logistics systems; and integrating microservices via durable event streams.
Is KahaDB or KurrentDB (EventStoreDB) more popular?
KurrentDB (EventStoreDB) ranks #177 on the WhichDB Score (18.6/100) and KahaDB ranks #762 (0.0/100). Popularity is not fit: check the requirements that matter for your project.
Are KahaDB and KurrentDB (EventStoreDB) open source?
Yes. KahaDB is open source. License: Apache License 2.0. Not in the OSI sense. KurrentDB (EventStoreDB) is source-available: you can read the code, but the license restricts some uses, typically offering it as a competing managed service. License: Kurrent License v1 (KLv1).