When you should create a new web application for your site in Microsoft SharePoint?

In Microsoft SharePoint, you have a couple of choices in order to have a new site. You can create a Web Application, a Site Collection or a Subsite.

In order to plan your information architecture in SharePoint, it is crucial to specify the type of sites you want to have.

Here is my suggestion on when you should create a new Web Application:

  1. Resource Throttling: every web application is an IIS website, so you can have a separate application pool for it and control hardware resource access. For example you can make the application pool process to use a certain amount of RAM on your system, or use a specific maximum amount of CPU. Moreover, inside SharePoint Central Administration, you can also do Resource Throttling based on specific SharePoint features, like List View Thresholds, …
  2. Service Applications: you can assign service application proxies at the Web application level. So if a specific site in your topology doesn’t require some heavy loading service applications, it is better to have a separate web application for that specific site.


Note 1: by default, when you create a Web application and want to use it, you should create a site collection and a site in order to have access.

Note 2: separate database is not a decision factor, because you can have both a database connected to a site collection or a web application

Note 3: having too many web applications with different application pools, can degrade your server performance

Note 4: if you need to do some changes in Web.Config, this file is only accessible at a web application level, it means all the site collections in a web application share a web.config

Note 5: it is always a good practice to have MySite feature in a separate web application.

Note 6: if you want to publish your site over the internet, you should have different FQDN for each web application, a proper subdomain is sufficient.

Note 7: if you are browsing different web applications and the browsers are not configured properly, you may experience multiple login requests which is annoying.

MCSE, PMP, With more than 12 years experience in Microsoft technologies.

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