Description: The query isolation level refers to the degree to which operations in one transaction are isolated from operations in other transactions within a database management system. This concept is fundamental to ensuring data integrity and consistency in environments where multiple transactions may occur simultaneously. A high level of isolation means that transactions are not affected by the operations of others, minimizing issues such as dirty reads, non-repeatable reads, and phantom reads. Isolation levels are commonly defined in the context of the ACID model (Atomicity, Consistency, Isolation, Durability), which establishes the properties that transactions must meet to ensure the reliability of database systems. There are several isolation levels, such as Read Uncommitted, Read Committed, Repeatable Read, and Serializable, each with its own characteristics and trade-offs in terms of performance and security. Choosing the appropriate isolation level is crucial for optimizing system performance and ensuring that data remains consistent, especially in critical applications where data accuracy is essential.
