title: How to add new indexes 'SAFELY' to a table on the Production Database?
body: <p>I consider adding some new Indexes on a table that is in the Production Db. and my concern is 'how to make it without having an impact on the users'</p>
  
  <p><strong>Question</strong>: (If it is not a BAD Idea) How can I be sure that it would not harm/impact the users to add extra indexes on a table in PRODUCTION Db. that has more than 5 million records?</p>