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In a database, a transaction is a sequence of operations that are treated as a single unit of work. A transaction typically involves a set of operations that manipulate the database, such as inserting or updating data. These operations are treated as a single unit, meaning that they must all be completed successfully for the transaction to be considered successful. If any part of the transaction fails, the entire transaction is rolled back, and the database is restored to its previous state. Transactions provide a way to ensure that database operations are reliable, predictable, and recoverable, making them a fundamental tool in modern database design.
ACID transactions are a set of properties that are used to guarantee the reliability and integrity of database transactions. In other words, they provide a way to ensure that all changes made to a database either occur in their entirety or not at all.
In practical terms, this means that if a transaction is interrupted or stopped, any changes made by the transaction are rolled back to their previous state. This ensures that the database remains in a consistent state and prevents any data inconsistencies.
ACID transactions have become an essential tool for database designers and developers, as they ensure that data is processed reliably and predictably. They are a fundamental part of modern databases, and their use has helped to make databases more robust and reliable than ever before.
ACID transactions are based on four core properties: atomicity, consistency, isolation, and durability.
Once an ACID transaction has been initiated, the operations are executed in a particular order. During this execution process, the database records every change made by the transaction, along with any actions needed to undo those changes.
If a transaction completes successfully, all of its changes are permanently written into the database. If any operation within the transaction fails, the entire transaction is rolled back, and the database is returned to its state from before the transaction began.
ACID transactions are used in a wide variety of applications and industries. Examples include: