Transaktionsåterlösning

Transaktionsåterlösning, also known as transaction rollback or undo, is a process in database management systems (DBMS) that reverses the effects of a transaction if it fails to complete successfully. This mechanism ensures data integrity and consistency by maintaining the ACID properties of transactions: Atomicity, Consistency, Isolation, and Durability. When a transaction encounters an error or is explicitly aborted, the DBMS uses a rollback mechanism to undo all changes made by that transaction, restoring the database to its state before the transaction began. This is achieved through logging mechanisms that record the changes made during a transaction, allowing the system to reverse them if necessary. Rollback is a critical feature in transaction management, enabling systems to recover from errors and maintain reliable data processing.