title: How to design Bigtable Key
body: <p>I would create my optimal key in Bigtable. I know the key design is crucial for query speed and optimization. My case is related to a time series information from a network machine. It is a tall and narrow table with 3 columns: <code>id</code>, <code>info</code> and <code>datetime</code>.</p>
  
  <p>My most frequent query is to get all info for each id for each day.</p>
  
  <p>How should the key be designed to obtain the best performances?
  <code>id#date</code>?</p>