Shares of enterprise software and cloud computing major Oracle (ORCL) had a tough trading session Thursday. Nosediving by more than 15% intraday, the stock closed 11% lower to have its worst day on the exchanges since 2001, as its Q2 revenues missed estimates. Moreover, its five-year CDS spread widened sharply to reach its highest levels since 2009. This makes the cost of raising debt more expensive for the Larry Ellison-led company. Oracle already has a debt pile of more than a hundred billion dollars, ...