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Is there a way to change the URL of a site collection?
Listed below are the Pros/Cons of all three methods. This is the old and traditional way to change the URL of a site collection. A lot of people we know used this method. But some time large sites or a large number of site collections require time. This method is time-consuming and requires downtime for the site collection.
What happens if a user is deleted from the site collection?
User Profiles should be removed, but you should not delete users from the Site Collection. If you do then you run into exactly the problem you describe above. The default is for User Profiles to be deleted automatically after a user is missing from the import on a User Profile Sync. But the user themselves is never removed.
Is there an integer ID for every user?
Yes, every user will have an ID. SPUser.ID is the integer ID of the user in the site collection. However, the ID is specific only to that specific site collection. I would recommend using SPUser.LoginName instead.
How to get access to SharePoint site collection?
As a SharePoint Online administrator, sign in to the site collection that was shared with the external user. Select the gear icon for the Settings menu, and then select Site settings. In the Users and Permissions section, select People and groups.
SharePoint Server supports two types of site collections: host-named site collections and path-based site collections. In a path-based site collection, all the subsites in the site collection will share a root or parent URL (DNS name).
How to make a copy of the site collection?
Copy-SPSite cmdlet is part of the upgrade and migration commands that is used to make a copy of the site collection to test and verify the upgrade process. This command is not recommended for day-to-day operations due to its limitation towards customization. But if you have an OOTB SharePoint site, then you can try this.
Is there a way to have a different URL root in SharePoint?
The only way to have a different URL root is to create a different web application. To better align with SharePoint best practices, you should use host-named site collections. Host-named site collections allow you to assign custom names to each site collection that you create in a web application.