The benchmark index was up about 76 points in morning trade on Wednesday as investors generally preferred to square up long as well as short positions a day ahead of the expiry of March contract of the Futures & Options segment.
The 30-share barometer index opened lower at 9,442.30 and hovered in a range of 9,566.81 and 9,430.45 before quoting at 9,547. 23 at 1030 hours against Tuesday's closing of 9,471.04, showing a gain of 76.19 points or 0.80 per cent.
The broad-based 50-issue Nifty of the National Stock Exchange also rose by 14 points, or 0.48 per cent, to 2,952.70 at 1030 hours from its last close of 2,938.70.
According to analysts, the market may remain volatile ahead of the expiry of the March contract on Thursday.
Asian shares were mixed on Wednesday as investors paused to assess whether a US plan to deal with banks' toxic debt would revive the financial system.
Market participants are not looking at the outcome of the forthcoming general elections.
Meanwhile, the Planning Commission yesterday said the economy will grow by 6.5 per cent during the current fiscal, much below the 7.1 per cent projected by the government last month.