In this paper, we review database management systems offered as services in cloud platforms. We started with
current achievements of cloud databases, continuing with three main characteristics which helps the users to clarify
the idea of moving from traditional DBMS to a cloud DBMS, suggesting to readers to migrate to the cloud. At the
end we explain a cloud DBMS architecture which is based on SCALEDB and it represents general architecture
principles of cloud DBMS. We can conclude that the best choice is moving into the cloud, because it is much
cheaper than other services, and it is a long time planning strategy of your work. Additionally, cloud database
services can offer more secure environments since it is in the cloud provider responsibility to keep our data secured
and recoverable any time that we need for them. Finally, moving to the cloud is the best choice for a company
because it decreases investments on storage and network resources that are not used optimally. The pay-as-you-go
model used by cloud providers allows more efficient use of these resources by sharing them across customers, and
thus it is cheaper because customers pay only for services they are effectively using.