Define the acronym ACID, and describe why ACID transactions are important.
What will be an ideal response?
Traditional relational DBMS products devote considerable code and processing power to support what are termed ACID (atomic, consistent, isolated, durable) transactions. In essence, this acronym means that either all of a transaction is processed or none of it is (atomic), that transactions are processed in the same manner (consistent) whether processed alone or in the presence of millions of other transactions (isolated), and that once a transaction is stored it never goes away-even in the presence of failure (durable). ACID transactions are critical to traditional commercial applications. Even in the presence of machine failure, systems must process both sides of a transaction (i.e. the sell and the buy sides); it cannot process part of a transaction. Also, what it stores today must be stored tomorrow.
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