title: ETL Oracle to Cassandra
body: <p>We had some users which their info. was stored in Oracle db. the tables include some Joins, too.  </p>
  
  <p>Now, I want to build a new project, using Cassandra which will use the information of previews users, too.  </p>
  
  <p>The data modeling is using Cassandra principles. But the question is that:<br>
  How I can <strong>move or migrate the needed hole heavy data from Oracle to new non-relational database</strong>? (what steps)</p>