The Sensex at the Bombay Stock Exchange gained a massive 329 points, or 1.8 per cent, to close above the 19,000-mark after nearly two months, at 19,171, today. The Sensex surged on optimism that the government will push through economic reforms, Goldman Sachs' upgrade of Indian equities, and a broader global market rally. The Nifty at the National Stock Exchange jumped 98 point, or 1.7 percent, to 5,825.Stock markets in Japan, Hong Kong, South Korea and Singapore climbed about 1 percent, each, as optimism grew that President Barack Obama will reach an agreement with the US Congress over a new budget.