title: Update MySQL 5.7 to MySQL 8.0
body: <p>I just updated my MySQL 5.7 database to MySQL 8.0</p>
  
  <p>The MySQL documentation says :</p>
  
  <blockquote>
    <p>The MySQL server always restarts after an update by APT. Prior to
    MySQL 8.0.16, run mysql_upgrade after the server restarts to check and
    possibly resolve any incompatibilities between the old data and the
    upgraded software. mysql_upgrade also performs other functions; see
    mysql_upgrade — Check and Upgrade MySQL Tables for details. As of
    MySQL 8.0.16, this step is not required, as the server performs all
    tasks previously handled by mysql_upgrade.</p>
  </blockquote>
  
  <p><a href="https://dev.mysql.com/doc/refman/8.0/en/mysql-upgrade.html" rel="nofollow noreferrer">https://dev.mysql.com/doc/refman/8.0/en/mysql-upgrade.html</a></p>
  
  <p>If I connect to MySQL and type the command :</p>
  
  <pre><code>mysql_upgrade
  </code></pre>
  
  <p>It displays :</p>
  
  <pre><code>-&gt;
  </code></pre>
  
  <p>Nothing happens, why ?</p>
  
  <p><a href="https://i.stack.imgur.com/Z4M91.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Z4M91.png" alt="enter image description here"></a></p>