Transactions ensure data integrity from "summary" of SQL and Relational Theory by C. Date
The concept of transactions ensuring data integrity is a fundamental aspect of relational database management. In a database system, data integrity refers to the accuracy, consistency, and reliability of the data stored in the database. Transactions are mechanisms provided by the database system to ensure that the database remains in a consistent state, even in the presence of failures or concurrent access by multiple users.
A transaction is a logical unit of work that consists of one or more database operations, such as reading or writing data. The ACID properties – Atomicity, Consistency, Isolation, and Durability – are essential characteristics of transactions that guarantee data integrity. Atomicity ensures that either all operations in a transaction are completed successfully, or none of them are executed. Consistency ensures that the database remains in a valid state before and after the transaction. Isolat...
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