What does mysql transaction processing mean?

MySQL transaction processing refers to a set of operations that are treated as a single unit of database operations, which means that this set of operations is either completely successfully executed or completely rolled back to the state before the operation. The basic principles of transaction processing are ACID, namely atomicity, consistency, isolation and durability. These principles ensure the stability and reliability of the database during transaction processing.

The operating system of this tutorial: Windows 10 system, mysql version 8.0, Dell G3 computer.

MySQL is a popular relational database management system that supports transaction processing. Transaction processing refers to a set of database operations that are treated as a single unit. This means that the set of operations will either execute completely successfully or completely roll back to the state before the operation. MySQL's transaction processing capabilities ensure data consistency and reliability.

In daily database operations, multiple related operations may be involved. For example, when placing an order on a shopping website, it involves operations such as reducing product inventory, generating orders, and deducting user account balances. In this case, to ensure the consistency of these operations, transactions need to be used for processing.

The basic principles of transaction processing are ACID, namely atomicity, consistency, isolation and durability. These principles ensure the stability and reliability of the database during transaction processing.

Atomicity means that a transaction is an indivisible unit of operations, and either all are executed successfully or all are rolled back. For example, when performing a set of operations, if one of the operations fails, all operations will be rolled back and the database will be restored to the state before the operation.

Consistency means that the execution of transactions will not violate the integrity constraints and business rules of the database. This means that the database must be in a consistent state at the beginning and end of a transaction. If an error occurs during transaction execution, the database should be restored to the state it was in before the transaction began.

Isolation means that each transaction should be isolated from other transactions during execution and not interfere with each other. This ensures that concurrently executing transactions will not conflict or overwrite each other's data.

Persistence means that after the transaction is successfully committed, the changes to the database should be permanent, and the data can be recovered even if a system or hardware failure occurs.

In MySQL, using transaction processing requires the following steps:

1. Start a transaction: Start a new transaction by executing the "BEGIN" or "START TRANSACTION" statement.

2. Perform transaction operations: Perform related database operations in a transaction, such as inserting, updating, or deleting data.

3. Commit the transaction: If all operations are executed successfully, use the "COMMIT" statement to commit the transaction to make it effective. This will ensure that changes are permanently saved in the database.

4. Rollback transaction: If an error occurs during transaction execution, you can use the "ROLLBACK" statement to roll back to the state before the transaction started and undo all operations.

Using transaction processing can ensure the data consistency and reliability of the database when multiple users access it concurrently. Transaction processing is an important feature in database management systems, which can effectively manage and protect data and improve the stability and reliability of data operations.

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