Hi @Anjali_Rani,
Please do not create duplicates of a question. This is not best practice in any forum. When you create a duplicate forum members who are trying to help you need to know what you have tried. Creating a duplicate will only delay the time it takes to resolve your question.
Original post : Vlookup to perform lakhs of data - Help / Studio - UiPath Community Forum
@Palaniyappan / @loginerror can you merge this to the original question?