This blog post explores the impact of big data on decision making in Tesco, one of the leading supermarket chains in the UK. It discusses the three important parameters of big data - velocity, volume, and variety - and how they pose challenges in capturing, storing, searching, transferring, sharing, modifying, evaluating, and visualizing data. The post also highlights the benefits of big data-based decision making in Tesco, such as developing new revenue streams, improving customer engagement and retention, and re-developing products.