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Transactions

  • Definition: A transaction comprises a unit of work performed within a database management system (or similar system) against a database, and treated in a coherent and reliable way independent of other transactions. Transactions in a database environment have two main purposes: To provide reliable units of work that allow correct recovery from failures and keep a database consistent even in cases of system failure, when execution stops (completely or partially) and many operations upon a database remain uncompleted, with unclear status. To provide isolation between programs accessing a database concurrently. Without isolation the program's outcomes are possibly erroneous.

    Source: Wikipedia

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