The scales in databases have recently increased, and more expansion is expected in the future. The storage costs gradually have slowed down and quickly expanded the storage capacity. Cloud intrusion has modified the comparisons in recent years. Database performance plays an essential part in the market. Cloud Database focuses on new, conventional databases, specific applications for scalability, dynamic devices, and ease of use. Cloud databases are primarily used for data storage, retrieval, modification, and analysis by tools like business intelligence. These tools can build new business strategies and demonstrate scalability and elasticity while managing vast amounts of data with reliable, customized, and cost-effective services in various applications. This paper provides an overview of cloud computing, Cloud database architecture and kinds, and database as a service. It also highlights the characteristics, deployment, and service model of cloud computing and the performance and functionality of the various SQL and NoSQL cloud database applications and services required to evaluate them. It focuses on the different parameters to assess their performance, such as ease of software portability, transaction capabilities, and the maximum amount of data stored. The primary purpose of this paper is to assist businesses and individuals in understanding how cloud computing may provide them with dependable, personalized, and cost-effective services in many applications.