title: Mysql showing all database when not assigned version 5.7.20
body: <p>In my database MYSQL, Local user is sometimes able to access all Databases and able to edit it and some times able to access only single database (i.e) his assigned database.</p>
  
  <p>Can anybody help why this abnormal behavior is happening in MySql 5.7.20</p>
  
  <p>By this abnormal behavior some users are deliberately able to delete some tables in my databases.</p>
  
  <p>Is there any solution ?</p>