How can I determine current version of my repository to see if I need to upgrade it (svnadmin upgrade)?
In reality I\'m hosting SVN with 3rd party and I want to find
If you use VisualSVN Server you can find out the format of the repository via the VisualSVN Server Manager console or via PowerShell. Read the article KB135: Understanding the Subversion repository types and formats for more information.
Follow these steps to find out the format of a repository:

Follow these steps to find out the format of a repository via PowerShell:
Get-SvnRepository MyRepo | Format-List