the background processes which are the operating system processes or threads that perform the work of accessing storing monitoring and recovering user data metadata and control files associated with the database
后台进程是操作系统进程或线程，它们执行访问、存储、监视和恢复与数据库相关的用户数据元数据和控制文件的工作
以上为机器翻译结果，长、整句建议使用 人工翻译 。