title: OO Databases that Pass by reference?
body: <p>I have played with MongoDB a little and wondered is there every going to be, or can there even be a database which passes by reference or pointer.</p>
  
  <p>E.g. I have a single user instance which can be put into multiple other arrays, if you change it once in one place it changes in all arrays.</p>
  
  <p>I understand that in a database you don't want your data flung all over the disk but might we ever see one?</p>