Advanced queries expressed in SQL work well with the strict relationships that are imposed on information by relational databases. The design and development of typical systems utilize data management and relational databases as their key building blocks. This is achieved by replicating data and failing instances over to other database instances. There is typically a commitment for a certain level of high availability (e.g.Scalability features differ between vendors – some offer auto-scaling, others enable the user to scale up using an API, but do not scale automatically.The service provider is responsible for installing, patching and updating the underlying software stack and ensuring the overall health and performance of the database. Underlying software-stack stack typically includes the operating system, the database and third-party software used to manage the database. The service API is exposed to the end user, and permits users to perform maintenance and scaling operations on their database instances. Database services consist of a database-manager component, which controls the underlying database instances using a service API.Most database services offer web-based consoles, which the end user can use to provision and configure database instances.This is a type of software as a service (SaaS). Instead, the database service provider takes responsibility for installing and maintaining the database, and application owners are charged according to their usage of the service. Database-as-a-service (DBaaS) With a database as a service model, application owners do not have to install and maintain the database themselves. Users can either upload their own machine image with a database installed on it, or use ready-made machine images that already include an optimized installation of a database. Virtual machine image Cloud platforms allow users to purchase virtual-machine instances for a limited time, and one can run a database on such virtual machines. There are two primary methods to run a database in a cloud:
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