What is mysql .log?

mysql .log refers to the binary log file. It is the log file used by the MySQL database engine to record all database change operations. Its functions are: 1. Data recovery, which can restore the database to the state before a specific point in time. To achieve data recovery; 2. Master-slave replication, the master server will generate and write binary log files, and then the slave server will read and apply the contents of these log files to maintain data consistency between the master and slave servers; 3. Auditing and Security, used as an auditing tool to monitor change operations in the database.

Operating system for this tutorial: Windows 10 system, MySQL 8 version, Dell G3 computer.

In MySQL, the .log file refers to the binary log file (Binary Log). It is the log file where the MySQL database engine records all database change operations. The binary log contains details of all change statements received and executed by the database server, such as inserts, updates, and deletes.

The binary log has the following functions:

1. Data recovery: The binary log is one of the main recovery mechanisms for the MySQL database. By using binary logs, you can restore the database to a state before a specific point in time, thereby achieving data recovery. It can be used to recover from system failures, user misoperations or data loss.

2. Master-slave replication: Binary logs are very important for MySQL master-slave replication. The master server will generate and write binary log files, and then the slave server will read and apply the contents of these log files to maintain data consistency between the master and slave servers.

3. Auditing and Security: Binary logs can be used as an auditing tool to monitor change operations in the database. It records all changes to the database, including user, timestamp, and executed SQL statements, thus providing an audit trail and security of database operations.

It should be noted that binary log files may occupy a large amount of disk space, so they need to be cleaned and maintained regularly. You can set retention time and size limits for binary logs to control their growth and cleanup policies.

In summary, the binary log is an important log file in the MySQL database. It is used for data recovery, master-slave replication and audit security. It is crucial to the reliability and availability of the database.

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