title: Data fetching is very slow when placing a limit of more than 100
body: <p>In Orientdb when I am running queries on console, it by default is taking limit as 20.
  But when I want all my records in my database, I have to put a limit like <code>limit 500</code> then it's taking a lot of time for 1000 records which is around 6 minutes!
  Someone please provide me some solution for such a case.
  And also, can we change the default limit 20 to a desired limit?</p>