Do you know the STSADM command line tool can do this still in SharePoint 2013? Yes! it can get you the quick peek view of all site collections in the given web application. It gets you details such as:
- Storage space allocated - Storage used, warning and maximum levels
- Site collection GUIDs
- Site collection database names
- Primary and Secondary Owners
Stsadm -o EnumSites -url http://Sharepoint-web-app-URL
This command line retrieves all details as listed above in XML format. Lets export that XML to a file and get it in Excel for better analysis. Run:
Stsadm -o EnumSites -url http://Sharepoint-web-app-URL > SitesInfo.xml
Once completed, Open the XML file in Microsoft Excel, choose "As an XML Table"
PowerShell script to get site collection size: How to check site collection size in SharePoint 2013 with PowerShell
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