Basic concept of transaction
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A transaction is a very small unit of a program and it may contain several lowlevel tasks. A transaction in a database system must maintain Atomicity, Consistency, Isolation, and Durability − commonly known as ACID properties − in order to ensure accuracy, completeness, and data integrity.
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A transaction is a unit of a program execution that accesses and possibly modifies various data objects (tuples, relations). DBMS has to maintain the following properties of transactions: Atomicity: A transaction is an atomic unit of processing, and it either has to be performed in its entirety or not at all.
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