db2vend(隔离的供应商进程)：代表一个EDU执行供应商代码，使实例执行用户退出程序，以便进行日志归档(仅在UNIX上)。

Db2vend (fenced vendor process) : Executes vendor code on behalf of an EDU, for instance to execute the user-exit program for log archiving (UNIX-only).

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重做日志是以循环的方式写入的；因此，在重写它们之前，需要通过启动 ARCH 进程来手动或自动对重做日志进行归档。

Redo logs are written in a round-robin manner; therefore, before they are overwritten, the redo logs need to be archived either manually or automatically by kick-starting the ARCH process.

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