title: Can someone explain in simple terms Cassandra nodetool commands like compact and cleanup?
body: <p><strong>Hello Everyone</strong></p>
  <p>I am new in databases and i am trying to understand some Cassandra commands. I would like to know about the following commands :</p>
  <ul>
  <li>nodetool compact</li>
  <li>nodetool cleanup</li>
  <li>nodetool repair</li>
  <li>nodetool garbagecollect</li>
  </ul>
  <p>I would appreciate some simple and clear answers like -&gt; nodetool help : it shows all the commands and their usage.</p>
  <blockquote>
  <p>The problem i am trying to solve is that after i delete (a lot of data) the storage is still full. I change the gc_grace_seconds to 1 day and still nothing. So if i need to clear the space manualy right now which commands should i run and in what order?</p>
  </blockquote>
  <p><em>Thanks for your time</em></p>