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Refers to workflow or other software systems that make changes in databases. The most rigorous transaction processing systems make copies of everything as the transaction occurs to guarantee that its completed correctly. If anything goes wrong, the state of all data involved is reset to its original state. Imagine you seek to move money from one account to another. The system checks to see that the money is removed from one account and placed in the other, and doesn't finalize things until its sure that both actions have occurred.
Online Transaction Processing (OLTP)
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