They are a collection of key-value pairs, and their simplicity makes them essentially the most scalable of NoSQL databases sorts. Key-value could be a string, a quantity, and a wholly new set of key-value pairs encapsulated in an object. Use circumstances embrace buying carts, consumer preferences, and leaderboards. In this research, we analyse temporal data management and how to deal with changes in a DW design, as nicely. To this end, a taxonomy of existing approaches has been built. Subsequently, we now have recognized numerous DW design schemes in literature and analysed their abilities to support temporal aspects and dealing with changes.
