Best place for an app server?

Hi all,
A rather generic question.
If you had only two server machines, one for your
database server and one for your web server.
Where would you place your app server?
In the same machine as the web server or in the same machine as the database server?
What factors would influence your decision?
Thanks for any answers
Nikos

Hi sagar,
According to your description, my understanding is that you want to learn about SharePoint hosted app and provider hosted app.
SharePoint-hosted apps, or apps where all components are hosted on either an on-premises or Office 365 SharePoint farm. SharePoint-hosted apps are installed on a SharePoint 2013 website, called the host web. They have their resources hosted on an isolated
subsite of a host web, called the app web. The SharePoint-hosted app can only be developed with JavaScript Client Object Mode and HTML.
Provider-hosted apps for SharePoint include components that are deployed and hosted outside the SharePoint farm. They are installed to the host web, but their remote components are hosted on another server.SharePoint Provider hosted app can be developed
with .NET Managed Client Object Model.
Here is a detailed article for your reference:
Choose patterns for developing and hosting your app for SharePoint
Here are some detailed code demo for your reference:
How to: Create a basic SharePoint-hosted app
How to: Create a basic provider-hosted app for SharePoint
Best Regards
Zhengyu Guo
TechNet Community Support

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