what is mysql transaction

MySQL transaction is a logical unit of a set of database operations. It provides a mechanism to ensure data consistency and integrity. It has the following four characteristics: 1. Atomicity. All operations in the transaction are considered An atomic unit either all executes successfully or all fails and is rolled back; 2. Consistency, the state of the database must be consistent before the transaction starts and after the end; 3. Isolation, the isolation of transactions ensures that each transaction can be independent 4. Persistence, once the transaction is committed, the modifications made will be permanently saved in the database.

Operating system for this tutorial: Windows 10 system, MySQL 8 version, Dell G3 computer.

MySQL transaction is a logical unit of a set of database operations (such as inserts, updates, deletes, etc.) that either all execute successfully or all are rolled back (undone). Transactions provide a mechanism to ensure data consistency and integrity, providing isolation between multiple operations.

Transactions have the following four characteristics (usually represented by ACID abbreviations):

1. Atomicity: All operations in a transaction are considered An atomic unit either all executes successfully or all fails and is rolled back. If any operation in the transaction fails, it will be rolled back to the state before the transaction started to ensure data consistency and integrity.

2. Consistency: The state of the database must be consistent before and after the transaction starts. This means that data changes caused by operations performed within a transaction must comply with predetermined rules and constraints and not destroy the integrity of the database.

3. Isolation: The isolation of transactions ensures that each transaction can be executed independently without being affected by other transactions. Modifications made by each transaction during execution are not visible to other transactions until the transaction commits.

4. Durability: Once a transaction is committed, its modifications will be permanently saved in the database, and the data will not be lost even if a system failure or other error occurs.

By combining multiple database operations into one transaction, you can ensure that the operations on the database are atomic and consistent, and avoid the problems of data loss and data inconsistency. In MySQL, you can use the BEGIN, COMMIT, and ROLLBACK statements to start, commit, and rollback transactions, as well as set the appropriate isolation level to control the isolation of transactions.

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