title: MySQL validate_password_policy unknown system variable
body: <p>I'm using MySQL 5.7.25 and i want to increase my MySQL password policy by doing this in MySQL command:</p>
  
  <pre><code>SET GLOBAL validate_password_policy=2;
  </code></pre>
  
  <p>But i always get an error:</p>
  
  <blockquote>
    <p>ERROR 1193 (HY000): Unknown system variable 'validate_password_policy'</p>
  </blockquote>
  
  <p>I tried to list the validate_password variable:</p>
  
  <pre><code>SHOW VARIABLES LIKE 'validate_password%'
  </code></pre>
  
  <p>but it always return empty set</p>