Sensex crossed 34,000-level in the opening session on Tuesday after a three day Christmas weekend. Indian stock markets started on a higher note with the key equity indices Sensex and Nifty surpassing their previous records. S&P BSE Sensex jumped 65.07 points to hit a lifetime high of 34,005.37 whereas NSE Nifty too edged up, rising by 22.1 points to mark another all-time high of 10,515.1. Shares of heavyweight companies such as Tata Consultancy Services, HDFC, ITC, ONGC, Asian Paints and Reliance Industries contributed to the upsurge of Sensex.