SummaryWhen viewing SharePoint databases, some databases saying "Database is up to date, but some sites are not completely upgraded"
- Go to Central Admin > Upgrade & Migration.
- View the Databases that need upgraded.
- Fix database upgrade status with PowerShell cmdlet: Upgrade-SPContentDatabase "DatabaseName"
- Once the process completes, navigate back to the "Manage Databases Upgrade Status"page in Central Admin and verify that the status is "No action required."