title: Which opensource database satisfies all these requirements?
body: <ol>
  <li><p>Supports C API for reading and writing into the DB.</p></li>
  <li><p>Support ACID transaction feature.</p></li>
  <li><p>Support sending notifications if any change happens to DB state.</p></li>
  </ol>
  
  <p>Finally it should be an open source.</p>
  
  <p>Could someone suggest a open source database which supports all these above features.</p>