In a mid-sized company, it is highly possible that the volume of data we own is not that big. However, if we are a retail company, it is likely that our transactional can have a good amount of transactions, especially if we have several years of data. Whether that is the case of your business or not, it is important to have some exposure to improve performance when working with databases. This is the reason this chapter was added to the book: to provide you with some insights about how to speed up your processes. Whereas this is not a very extensive compilation, it should be enough to start.