How can I determine what sites are being referenced within Central Admin Upgrade and Migration Manage Databases Upgrade Status?

Question

When I go to Central Admin > Upgrade and Migration  > Manage Databases Upgrade Status, I have 2 content databases which have the status:
Database is up to date, but some sites are not completely upgraded.
How can I determine which sites are not completely upgraded?

Answer 1

Manage Databases Upgrade Status will provide you all active and offline DB details, you can get same result
using below PowerShell cmdlet.
Get-SPDatabase and Get-SPContentDatabase will provide all active database/Content DB in Farm which include Service application db, central admin DB.
Get-SPDatabase | Format-Table Name, ID
Coming back to your question, if you find that there are some site are not completely upgraded then run below command and understand the cause if issue on specific DB.
Test-SPContentDatabase WSS_ContentDB_Name
If you find any missing file issue in DB then resolve these issue to upgrade content database.
(verify all customizations referenced within the content database are also installed in the web application. This cmdlet can be issued
against a content database currently attached to the farm, or a content database that is not connected to the farm )
Use the Upgrade-SPContentDatabase cmdlet
to resume a failed database upgrade or begin a build-to-build database upgrade against a SharePoint content database
Upgrade-SPContentDatabase WSS_Content
reference:
http://technet.microsoft.com/en-us/library/ff607813(v=office.15).aspx
http://technet.microsoft.com/en-us/library/ff607941(v=office.15).aspx
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Thanks, ShankarSingh(MCP)