April 2001
Beginner
792 pages
17h 51m
English
Content preview from Microsoft® SQL Server™ 2000 Programming by ExampleBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Characteristics of Transactions (ACID)
A transaction is a sequence of operations executed as a single logical operation, which must expose the ACID (Atomicity, Consistency, Isolation, and Durability) properties. These are as follows:
Atomicity—The transaction must be executed as an atomic unit of work, which means that it either completes all of its data modifications or none at all.
Consistency—The data is consistent before the transaction begins, and the data is consistent after the transaction finishes. To maintain consistency, all integrity checks, constraints, rules, and triggers must be applied to the data during the transaction. A transaction can affect some internal SQL Server data structures, such as allocation maps and indexes, and SQL ...
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