Rising for the second straight session, the Sensex at the Bombay Stock Exchange gained 109 points, or 0.6 percent, to close at 19,253, today, amid firm global markets. The Nifty at the National Stock Exchange rose 34 points, or 0.6 percent, to 5,819.Stock markets in Japan, China, Hong Kong, South Korea and Singapore gained between 0.2 percent and 2 percent.