title: Does retention policy affect the database size on disk?
body: <p>Even after InfluxDB (v0.11) deleted the expired data from database, the size of the database remains the same on disk.
  Has anyone faced the same problem or am I doing something wrong.
  Ideally after expiry of the data the size of the database should decrease right?
  Also just to verify how do any of you check database size on local machine.</p>