MySQL Redo Log: Purpose Explained

The redo log of MySQL is a log file used to record all changes made in the database. Its main functions include:

1. Data persistence: The redo log of MySQL ensures that in the event of abnormal situations such as crashes or power cuts, data can be recovered through the records in the redo log, guaranteeing data persistence and consistency.
2. Data recovery: In the event of database abnormality resulting in data loss or corruption, data can be recovered using the redo log to restore the database to its previous status.
3. Improved performance: the presence of redo logs can reduce the actual number of database operations by writing modification operations to the redo log file and then asynchronously flushing them to disk by background threads, reducing database I/O operations and thus enhancing database performance.

In conclusion, the redo log is a crucial component in MySQL that ensures data safety, consistency, and enhances database performance.