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ESENT technology explained through Wikipedia

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ESE/ESENT is an embedded database engine providing ACID (Atomic, Consistent, Isolated, Durable) transactions with snapshot isolation using multi-version concurrency control and the ARIES variant of write-ahead logging for recovery. Transactions can have savepoints. An update can have optimistic concurrency control (i.e. a write-conflict isn't detected until JetUpdate is called). Data and indexes are stored as B+ trees.

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