WSS_Content is too old and upgrade is required in SharePoint 2013 Manage Database Upgrade Status

After complete an regular hotfix upgrade on SP 2013,  I see two 'WSS_Content' databases in the "Manage Database Upgrade Status" page:

DatabaseTypeStatus

WSS_Content Content DatabaseNo action  required

WSS_Content MetadataWebServiceDatabase       Database is too old and upgrade is required

I Looked up and found this:

http://technet.microsoft.com/en-us/library/ff607813%28v=office.14%29.aspx  

I tried command in SharePoint Management Shell:

Upgrade-SPContentdatabase  WSS_Content

Also with different flags but it always return this message:

 " the WSS_Content database does not need to be upgraded"

How can I fix the 2nd WSS_Content upgrade issue?

Thanks for any advice!