title: Cannot DROP TABLE in mysql
body: <p>I insert data with PHP PDO just like:
     beginTransaction -> execute query -> commit
  and everything is going well. But I found that, after I insert data with this steps. I can't run drop table in mysql command line.</p>
  
  <p>when I type this :
     mysql> drop table accounts;
  the terminal will keep running but nothing will be change. I must Ctrl+C to abort it.</p>
  
  <p>I want to know the reason about these. and how to fix it?</p>