title: Why must a table with a nonclustered columnstore index be read only?
body: <p>I was reading [this MSDN article].(<a href="http://msdn.microsoft.com/en-us/library/gg492088.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/gg492088.aspx</a>) </p>
  
  <p>One of the key differences between a clustered and non-clustered index is that a clustered index is updateable.  Fine - but what property of a non clustered index leads it (and the table) to be read only?  Why can a change to the table not be reflected in the index?</p>