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Transaction - a sequence of logically related actions (reads or writes) over the database objects.

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Consistency - a transaction property which moves a database from one consistent state to another on txn finish. A meaning of the consistent state is defined by a user.

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Multi-version concurrency control (MVCC) - a family of concurrency control techniques based on writing multiple record versions (copy-on-write). Eliminates blocking between reads and writes.

Recoverable schedule - a transaction execution schedule which is not affected by aborting of some other transaction. A transaction reads only committed values to achieve this.

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