假設您有一小群程式要在Windows系統上解除安裝，但Windows只允許您一次解除安裝一個程式。為什麼？是什麼阻止您同時解除安裝多個程式？

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

問題

超級使用者讀者Jeroen Bollen想知道為什麼一個人不能在Windows中同時解除安裝多個程式：

Why does Windows keep you from uninstalling or removing multiple programs simultaneously? What is the reasoning behind this? Will it mess up an internal system?

I do not want to uninstall multiple programs simultaneously, I am simply looking for the reason(s) why it would not be an option.

是什麼阻止人們在Windows中同時解除安裝多個程式？

答案

超級使用者貢獻者ultrasawblade和techie007為我們提供了答案。首先，ultrasawblade：

If you read anything about how the Windows installer system works, it is obvious that they applied some ideas from transactional databases to program installation and maintenance, not to mention that .msi files themselves are a database.

There is always the question in designing any database – do you want speed or accuracy/safety? Given that installers can modify a system’s configuration and that a mishap could render the system inoperable, safety has been given a priority over speed.

One of the reas*** why .msi installers are so slow is because rollback files are made for each file, etc. that will be modified, then deleted afterwards, allowing any changes to be “rolled back” if something goes wrong in the middle of things (such as a power outage or system crash).

Now, I believe the MSI engine itself enforces installing, modifying, or removing only one program at a time. If you try to run an .msi file while another is uninstalling for example, it will either not run, or will wait for the currently running uninstall process to finish. Non-MSI installers may not behave this way since they do not use the MSI engine. But because of this safety design decision, this is probably why appwiz.cpl insists on letting only one uninstaller be called at once.

CCleaner allows you to kick off uninstallers without waiting for previously running ones to finish, but MSI installers will likely still not work in parallel due to the above.

然後是techie007的答案：

This really only applies to programs that use the Windows Installer system.

If a program uses their own (un)installer systems, then there is nothing stopping you from running another uninstaller at the same time.

The Windows Installer limits the number of instances to avoid conflicts being made by multiple programs while they are changing system-wide (often shared) settings and files.

Most uninstallers track what they are changing so they can roll back successfully if there is a failure. If one is not aware of all the changes being made (by other uninstallers), then it may actually make things WORSE if it tries to roll back a failed install.

The Windows Installer system was created with the intention of being a unified system for all application developers to use (on Windows) in order to help avoid problems like these.

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