How to improve performance by canceling MySQL autocommit

MySQL is a popular relational database management system designed to provide efficient, reliable, and flexible data storage and processing solutions. However, MySQL has some shortcomings in automatically committing transactions, which may reduce its performance. In this article, we will explain how to improve the performance of MySQL by suppressing its autocommit.

1. What is MySQL automatic submission?

MySQL automatic submission means that for any SQL statement, a transaction will be automatically started by default and the transaction will be submitted immediately after the statement is executed. This automatic commit mode ensures data consistency and reliability, but it also affects MySQL performance.

2. Why can canceling MySQL automatic submission improve performance?

MySQL automatic commit will increase the I/O load of the database because each execution of a SQL statement requires a disk write operation. When updates or inserts are performed frequently, this operation can become expensive, resulting in performance degradation.

In addition, the transaction overhead of MySQL's automatic submission will also affect performance. Since each SQL statement starts a transaction, and the transaction overhead is very high, frequent use of automatic commit will increase transaction overhead, thereby reducing MySQL performance.

Canceling MySQL auto-commit can alleviate this problem because it allows us to remove the additional overhead and write operations of each SQL statement. In some high-concurrency applications, canceling MySQL automatic commit can help us improve performance and reduce latency.

3. How to cancel MySQL automatic submission?

Cancel MySQL auto-commit is very simple, just use the following command:

SET AUTOCOMMIT = 0;

This command will cancel the auto-commit mode and put all subsequent SQL statements in the same transaction. Doing so reduces transaction overhead and improves performance.

When you need to submit a transaction, you can use the following command:

COMMIT;

This command will submit the current transaction and start the next transaction. If you need to roll back a transaction, you can use the following command:

ROLLBACK;

This command will roll back the current transaction and start the next transaction immediately.

4. Precautions

Although canceling MySQL automatic submission can improve performance, we also need to pay attention to some possible problems. For example, if we crash or lose power before committing a transaction, all uncommitted changes will be lost. In addition, when multiple clients access the same table at the same time, we need to ensure that the order of all transactions is correct.

When canceling MySQL automatic commit, we need to pay attention to the following points:

1. Don't forget to manually commit the transaction after each operation. Otherwise, your changes will be lost.
2. Do not modify auto-commit settings before modifying the configuration or before completing a complete session.
3. If you use multiple tables in a transaction, you need to ensure that the order of operations is correct before committing.
4. In a transaction concurrency performance test environment, canceling automatic submission can improve performance, but in a production environment, comprehensive analysis and testing are required based on the actual situation.

5. Summary

Cancel MySQL auto-commit is a simple and effective technique that can optimize the performance of noDB transactions. However, we also need to pay attention to security and data integrity when using it, and conduct testing and tuning based on actual conditions. Through appropriate optimization, we can make MySQL more efficient, reliable, and flexible to meet business needs.

The above is the detailed content of How to improve performance by canceling MySQL autocommit. For more information, please follow other related articles on the PHP Chinese website!