webistrano username$ sudo RAILS_ENV=production rake db:migrate
/Users/username/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems.rb:900:in `report_activate_error': Could not find RubyGem rake (>= 0) (Gem::LoadError)
    from /Users/username/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems.rb:248:in `activate'
    from /Users/username/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems.rb:1276:in `gem'
    from /Users/u sername/.rvm/gems/ruby-1.9.2-p180/bin/rake:18:in `<main>'

webistrano username$ RAILS_ENV=production rake db:migrate
rake/rdoctask is deprecated.  Use rdoc/task instead (in RDoc 2.4.2+)
rake aborted!
uninitialized constant MysqlCompat::MysqlRes

Tasks: TOP => db:migrate
(See full trace by running task with --trace)