title: Oracle database export missing tables
body: <p>I've exported an instance of an Oracle 11g database (full) without shutting it down only to find that there are 400+ tables missing (were not exported).
  This database is used by an application and possibly had users on it.</p>
  
  <p>The command I used was </p>
  
  <pre><code>exp SYSTEM@db1 FULL=y FILE="C:\backup.dmp" GRANTS=y ROWS=y log="C:\backup.log" 
  </code></pre>
  
  <p>Would not shutting it down before exporting make it skip all these tables? </p>