What is a transaction and what are ACID properties?
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Answer Posted / sonu
A transaction is a sequence of sql Operations,
work as single atomic unit of work. To be qualify
as a "Transaction" , this sequence of operations must satisfy 4 properties , which is knwon as ACID test.any database must follow these acid properties.
Atomicity:-The sequence of operations must be atomic,
either all or no operations are performed.
Consistency:- When completed, the sequence of operations
must leave data in consistent mode. All the defined
relations/constraints must me Maintained.
Isolation: A Transaction must be isolated from all other
transactions. A transaction sees the data before the
operations are performed , or after all the operations has
performed, it can't see the data in between.
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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