In the Event Store Essentials course series, “Event Store Ltd.” and the capitalized “Event Store” refer to the company that develops EventStoreDB.
Event streams
Tailored for event storage, EventStoreDB surpasses traditional databases by allowing the storage of every state change as a distinct event. This capability means that instead of just keeping the latest state, you can track the entire history of changes, organized logically into streams—usually one per entity.
Indexes
With a design that stores indexes separately from data files, EventStoreDB ensures swift access to records by stream name, creating index entries with each committed event.
As more files are saved, EventStoreDB efficiently merges them to maintain a streamlined and accessible data structure.
Projections
This powerful subsystem within EventStoreDB allows for the dynamic response to events by appending new events or linking existing ones to streams.
Especially adept at handling “temporal correlation queries”—a common yet complex query type in business systems—projections offer a specialized solution that few databases can match.
Subscriptions
Staying updated with changes is seamless with EventStoreDB subscriptions. As new events are recorded, you can automatically receive notifications, ensuring your system remains in sync and responsive to the latest developments.
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