I take back my previous posting about segfault on passing clob to callproc. Apparenty one has to instantiate a clob via Connection.LobLocator. The following code works: ------------------- import DCOracle2 db = DCOracle2.connect(...) c = db.cursor() lob = db.LobLocator() lob.write("hei") c.callproc("myproc",lob) ---------------------------