Description: Query isolation refers to the degree to which operations performed in one query are separated and do not affect the operations of other queries in a database management system. This concept is fundamental in the design of systems that handle multiple queries simultaneously, as it ensures the integrity and consistency of data. In an environment where several queries can be executed at the same time, isolation ensures that the results of one query are not altered by the operations of another, which is crucial to avoid issues such as dirty reads, non-repeatable reads, and phantom reads. Query isolation can be implemented through different isolation levels, which determine how concurrent transactions are managed. These levels include, among others, ‘Read Uncommitted’, ‘Read Committed’, ‘Repeatable Read’, and ‘Serializable’, each with its own characteristics and trade-offs in terms of performance and consistency. In the context of database systems, query isolation becomes especially relevant, as these technologies allow the execution of queries over large volumes of data, where concurrency and efficiency are essential for system performance.
