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Published: Jul 30, 2011
Last Updated: Jul 08, 2014
Event Sourcing ensures that all changes to application state are stored as a sequence of events. Not only can we query these events, we can also use the event log to reconstruct past states, and as a foundation to automatically adjust the state to cope with retroactive changes. Complementary to the capture of business meaningful events, the technique has positive implications for analytics in driving greater customer insight.
Event sourcing is an approach to thinking about persistent data where the primary record is a log of all events that make updates. A traditional representation of database state can be entirely recreated by reprocessing this event log. Event sourcing’s benefits include strong auditing, creation of historic state, and replaying of events for debugging and analysis. Event sourcing has been around for a while, but we think it is used much less than it should be.