title: Connection pool has been unable to grant a connection to thread
body: <p>I'm using GreenDAO for database handling in Android. When performing many database changes (> 15.000) I get this error Message:</p>
  
  <blockquote>
    <p>The connection pool for database '/data/data/...' has been unable to grant a connection to thread 312 (Thread-312) with flags 0x1 for 30.000002 seconds.</p>
  </blockquote>
  
  <p>Everything gets stuck. Why does this error happen?</p>