Quick Guide to ACID in MySQL

ACID properties are fundamental in database management, ensuring data integrity and consistency. This guide provides a brief overview of ACID in MySQL, showcasing key examples to illustrate each property.

Atomicity

Executes all transaction statements as a single unit, failing entirely if one part fails.

START TRANSACTION;
INSERT INTO users (id, name) VALUES (1, 'John');
INSERT INTO users (id, name) VALUES (2, 'Jane');
COMMIT;

Consistency

Ensures database consistency by adhering to rules before and after transactions.

START TRANSACTION;
UPDATE users SET balance = balance - 50 WHERE id = 1;
UPDATE users SET balance = balance + 50 WHERE id = 2;
COMMIT;

Isolation

Ensures transactions are executed independently.

SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
START TRANSACTION;
SELECT * FROM users WHERE id = 1;

Durability

Guarantees committed transactions remain even after system crashes.

START TRANSACTION;
INSERT INTO orders (id, amount) VALUES (1, 150);
COMMIT;

FAQ

What is ACID?

ACID stands for Atomicity, Consistency, Isolation, and Durability, ensuring reliable and consistent transactions.

Why is ACID important in MySQL?

ACID properties prevent data corruption and maintain consistency, even during failures.

Can ACID be optimized for speed?

Yes, adjusting settings in the MySQL configuration file (my.cnf or my.ini) can enhance performance while balancing ACID compliance.

Which MySQL storage engines support ACID?

InnoDB and Percona XtraDB support ACID properties in MySQL.

Conclusion

ACID principles are crucial for effective MySQL database management, ensuring data reliability and integrity. For a comprehensive guide, visit the article A Guide to ACID In MySQL.