title: Error ORA-00054 resource busy and acquire with NOWAIT specified or timeout expired in oracle11g
body: <p>I'm using oracle11g database. I have a table in the name of <code>phonenumbers_tbl</code> and I performed the <code>DROP</code> command on that table. But It is returning the error <code>resource busy and acquire with NOWAIT specified or timeout expired</code>. After that I was alter the session with the command <code>alter session set ddl_lock_timeout = 600</code> and Again try to drop the table. But still This error is persisting again</p>