title: Partitioned Collection paritionkey
body: <p>I´m confused what to choose for PartitionKey and what effect it has. If I use Partitioned Collection then I must define a Partition Key that can be used by DocumentDB to distribute the data among multiple servers. But lets say that I choose a partitionKey that is always the same for all documents. Will I still be able to get up to 250k RU/s for a single Partitioned Collection?</p>
  
  <p>In my case the main query is get all documents with paging but in a timeline (newest first)</p>
  
  <pre><code>SELECT TOP 10 c.id, c.someValue, u.id FROM c
  JOIN u IN c.users ORDER BY c.createdDate DESC
  </code></pre>
  
  <p>A minified version of the document looks like this</p>
  
  <pre><code>    {
       id: "1", 
       someValue: "Foo"
       createdDate: "2016-14-4-14:38:00.00"
       //Max 100 users
       users: [{id: "1", id: "2"}]
      }
  </code></pre>