I noticed this warning on top of my Central Administration page after the migration from SharePoint 2013 to 2016.
The SharePoint Health Analyzer has detected some critical issues that require your attention. View these issues.
One of the Configuration warnings is Databases running in compatibility range, upgrade recommended.
To clear this warning, follow the steps below:
- Open SharePoint 2016 Management Shell from the SharePoint server
- Use this cmdlet to upgrade content databases
Get-SPContentDatabase | Upgrade-SPContentDatabase
- Use this cmdlet to upgrade the other databases such as Search
PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
- Once the upgrades are done, click Reanalyze Now against the issue.