What is ACID compliance in MySQL

ACID compliance in MySQL refers to a set of properties that guarantee that database transactions are processed reliably. ACID stands for Atomicity, Consistency, Isolation, and Durability. These properties ensure that transactions are completed successfully, resulting in reliable database operations.

Atomicity means that a transaction is treated as a single unit that either completes in its entirety or does not happen at all. If any part of the transaction fails, the entire transaction is rolled back.

Consistency ensures that a transaction brings the database from one valid state to another, maintaining all predefined rules, including integrity constraints.

Isolation guarantees that concurrently executed transactions do not affect each other's execution. Each transaction is isolated until it is completed, ensuring data accuracy and integrity.

Durability ensures that once a transaction has been committed, it will remain so even in the event of a system failure. The changes are written to a non-volatile storage system.

Here's an example of how you can implement a transaction in MySQL that adheres to ACID properties:

<?php $mysqli = new mysqli("localhost", "user", "password", "database"); // Start a transaction $mysqli->begin_transaction(); try { // Perform SQL queries $mysqli->query("INSERT INTO accounts (balance) VALUES (100)"); $mysqli->query("INSERT INTO accounts (balance) VALUES (200)"); // Commit the changes $mysqli->commit(); } catch (Exception $e) { // If there is an error, rollback the transaction $mysqli->rollback(); echo "Transaction failed: " . $e->getMessage(); } ?>

ACID compliance MySQL transactions database reliability database transactions SQL database rules

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