if the mysqld execution user is authorized, page cleaner thread priority can

如果mysqld执行用户被授权，页面清理线程优先级是可以调整的。

在MySQL中，页面清理器负责将脏页（已被修改但尚未写回磁盘的页）从内存中写回到磁盘，以便腾出空间供新的数据读取和写入。页面清理线程的优先级可以通过操作系统的权限来调整。

当mysqld执行用户被授权时，这意味着该用户具有足够的权限来对数据库进行管理。这样的话，他就可以通过更改操作系统的设置来调整页面清理线程的优先级。

调整页面清理线程的优先级可以根据系统的特定需求来进行。例如，如果系统的负载较重，可以将页面清理线程的优先级设置得比较高，以确保脏页能够快速地被写回磁盘，从而降低系统的内存压力。

然而，需要注意的是，调整页面清理线程的优先级可能会对系统的性能产生影响，因此必须谨慎操作。必须仔细评估系统的负载情况和资源利用情况，确保调整优先级不会导致其他性能问题的出现。

总之，如果mysqld执行用户被授权，页面清理线程的优先级是可以根据系统需求进行调整的。但在操作之前，需要充分了解系统的特点和性能需求，并谨慎操作，以确保对系统的性能和稳定性没有负面影响。

相关问题

The slave I/O thread is not running

The error message "The slave I/O thread is not running" indicates that the slave database server is not able to connect or synchronize with the master database server in a MySQL replication setup.

Here are a few steps you can follow to troubleshoot and resolve this issue:

1. Check the connection settings: Verify that the slave database server has the correct configuration settings for connecting to the master database server. This includes the `master_host`, `master_user`, `master_password`, and `master_port` variables in the slave's MySQL configuration file (`my.cnf` or `my.ini`).

2. Verify network connectivity: Ensure that the slave database server can reach the master database server over the network. Check for any firewall rules or network restrictions that may be blocking the connection.

3. Check replication user permissions: Ensure that the replication user on the master database server has the necessary permissions to replicate data to the slave. The user should have the `REPLICATION SLAVE` privilege granted.

4. Check replication status: Use the following command on the slave database server to check the replication status:

   SHOW SLAVE STATUS;

Look for any errors or warnings in the output, such as a failed connection or replication lag. Pay attention to fields like `Slave_IO_Running` and `Last_IO_Error` to identify potential issues.

5. Restart replication: If you have made any changes to the configuration or encountered errors, you can try restarting the replication process on the slave database server. Use the following commands:

   STOP SLAVE;
   START SLAVE;

6. Monitor logs: Check the MySQL error log file on both the master and slave database servers for any relevant error messages or warnings that might shed light on the issue. The log files are typically located at `/var/log/mysql/error.log` or `/var/log/mysqld.log`.

If you are still unable to resolve the issue, it may be helpful to consult the MySQL documentation or seek assistance from the MySQL community or database administrators with expertise in MySQL replication.

mysqld.service is not a native

b'mysqld.service is not a native' 的意思是 mysqld 服务不是本地服务。这通常是指在 Linux 系统上安装的 MySQL 数据库服务不是由系统自带的，而是由第三方安装的。