I have a subversion server wich severals repositories wich are accessible via https/webdav. We need to allow svn+ssh access too on the same repositories. Is this a problem to have both access from svnserve and from webdav at the same time? Repositories use bdb of fsfs.
You may likely run into issues with file permissions, because one svn+ssh user will eventually commit with a umask with insufficient permissions, effectively preventing the webserver from writing and thus breaking DAV. I usually advocate to use only one access method, with DAV being the preferred one, because it cleanly abstracts the permission complex away from filesystem and local users into the webserver.