The Sensex, which gained 371 points in the last two trading sessions, advanced by 40.85, or 0.23 per cent, to 17,724.58 in first five minutes of trading.
Similarly, the wide-based National Stock Exchange Nifty index edged up 8.85 points, or 0.17 per cent, at 5,350.95.
The both the stocks exchanges were open for a special 90-minutes to test their disaster recovery site.
