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Answer Posted / imran siddiqui
A transaction is an atomic unit of work that must be
completed in its entirety.The transaction succeeds if it
committed and fails if it is aborted.
Database theory has a more rigorous definition of a
transaction and states that a transaction has four
fundamental properties, known as ACID properties:
A(Atomicity):-The sequence of operations must be atomic,
either all or no operations are performed.
C(Consistency):- When completed, the sequence of operations
must leave data in consistent mode. All the defined
relations/constraints must me Maintained.
I(Isolation): A Transaction must be isolated from all other
transactions. A transaction sees the data defore the
operations are performed , or after all the operations has
performed, it can't see the data in between.
D(Durability): All oprtaions must be permanently placed on
the system. Even in the event of system failure , all the
operations must be exhibit.
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