How to check the progress of MySQL database recovery

MySQL is a very commonly used open source relational database management system. It has the characteristics of stability, efficiency, and flexibility, and is widely used in various types of applications. When using MySQL, you will inevitably encounter database recovery operations. How to accurately check the progress of MySQL database recovery has become a more important issue.

The recovery progress of the MySQL database can be obtained by viewing the MySQL error log. In the MySQL error log, all database operation records are recorded, including recovery operations. You can judge the recovery progress of the database through some key identifiers and information in the error log.

The following are key identifiers and information in some common MySQL error logs, which can be used to judge the progress of database recovery:

1. InnoDB: Doing recovery: This information indicates that the database is in progress The recovery operation can indicate that the database recovery is in progress.
2. InnoDB: Apply batch completed: This information indicates that the batch application has been completed, indicating that a batch of recovery logs has been applied.
3. InnoDB: Log scan progressed past checkpoint: This information indicates that the log scan has exceeded the checkpoint, indicating that database recovery is in progress.
4. InnoDB: Database was not shutdown normally: This message indicates that the database was not shut down normally, a failure may have occurred, and database recovery operations are required.
5. InnoDB: Starting crash recovery: This information indicates that the database is starting crash recovery operations, indicating that database recovery is in progress.

Through the above key identifiers and information, you can roughly understand the progress of MySQL database recovery. Of course, in order to understand the progress more accurately, you can also use some tools and commands to view the status and process of the database.

The following is a specific sample code for viewing the recovery progress of the MySQL database:

# 首先登录到MySQL服务器
mysql -u root -p

# 在MySQL命令行中查看错误日志路径
SHOW VARIABLES LIKE 'log_error';

# 复制错误日志路径，查询错误日志内容
sudo tail -f 错误日志路径

# 在错误日志中查找关键标识和信息，来判断数据库恢复进度

In the above sample code, by using the SHOW VARIABLES command and tail -f command to view the MySQL error log and judge the progress of database recovery through the key identifiers and information in the error log.

In summary, to check the recovery progress of the MySQL database, you can judge by checking the MySQL error log and looking for key identifiers and information. At the same time, you can also use some tools and commands to view the status and process of the database. These methods can help us accurately understand the progress of MySQL database recovery for subsequent operations and adjustments.

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