title: DOs and DONTs for Indexes
body: <p>What are some DOs and DONTs for improving database performance using index?</p>
  
  <p>A DO would be a case in which an index should be created, or another indexes related tip that will improve performance.</p>
  
  <p>A DONT will be a case when an index shouldn't be created, or another index related action that can hurt the performance.</p>