Repost from Paul's site:
Following on from previous blog and day 2 of upgrade found some of the databases were reporting the following error:
Database is in compatibility range and upgrade is recommended
This was appearing on non content databases (as in SharePoint system databases).
This seemed strange as I mentioned in my previous blog that the upgrade had been successful so was a little perplexed to find this issue.
After a little research there didn't seem to be anything that looked to answer my problem.
Although this blog was referring to Windows 7 it was interesting in helping my trail of thought and also made me aware that you can only upgrade content databases and not just standard SharePoint system databases using PowerShellhttp://blogs.technet.com/b/blairb/archive/2010/07/16/patching-sharepoint-2010-on-windows-7.aspx.
Another article relating to this was found here where no solution had actually been found (at the time of blogging)http://social.technet.microsoft.com/Forums/en-IE/sharepoint2010setup/thread/7d3ee7cf-56f8-46fe-b2c9-b8662e88825a
So concluding that I could only upgrade content databases the above did not help in resolving the issue.
The two databases in question were:
Database – Type
WSS_Search - SPSearchDatabase
WSS_UsageApplication - SPUsageDatabase
I finally managed to resolve the problem by running a b2b upgrade command:
PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
Credit to this blog (http://blog.techgalaxy.net/archives/2585) for pointing out the b2b command as I was having issues running this prior to finding this.