title: Persistence Database(MySQL/MongoDB/Cassandra/BigTable/BigData) Vs Non-Persistence Array (PHP/PYTHON)
body: <p>How beneficial will it be to use <code>Python/PHP</code> Nonpersistent array for storing <strong>6GB+</strong> data with <strong>800+ million</strong> rows in RAM, rather than using MySQL/MongoDB/Cassandra/BigTable/BigData(Persistence Database) database when it comes to speed/latency in simple query execution?</p>
  
  <p>For example, finding one name in 800+ million rows within 1 second: is it possible? Does anyone have experience of dealing with a dataset of more than 1-2 billion rows and getting the result within 1 second for a simple search query?</p>
  
  <p>Is there a better, proven methodology to deal with billions of rows?</p>