Database as a service: some cloud platforms offer options for using a database as a service, without physically launching a virtual machine instance for the database. For example, Oracle provides a ready-made machine image with an installation of Oracle Database 11g Enterprise Edition on Amazon EC2. 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. It is possible to run a database on these virtual machines. Virtual machine Image - cloud platforms allow users to purchase virtual machine instances for a limited time. Deployment model: There are two primary methods to run a database on the cloud: Standards: There are currently no standards to convert a centralized database into a cloud solution. Integrity: It may be difficult to maintain the integrity of the database if it is too complex or changes too quickly. Security: Database fragments must be secured and so must the sites housing the fragments. Labor costs: With added complexity comes the need for more workers on the payroll. Complexity: Database administrators have extra work to maintain the system. Flexibility: System can be change and modified without harm to the entire database. Price: It is less expensive to create a network of smaller computers with the poour of one large one. Improved performance: Data is located near the site with the greatest demand and the database systems are parallelized, which allows the load to be balanced among the servers. Improved Availability: If there is a fault in one database system, it will only affect one fragment of the information, not the entire database. The advantages of such a database include the following:

Distributed databases like Amazon’s SimpleDB ,spread information among physically dispersed hardwae.But to the client, the information seems to be located at one place. Of the databases available on the cloud, some are SQL-based and some use a NoSQL data model.

There are two common deployment models: users can run databases on the cloud independently, using a virtual machine image, or they can purchase access to a database service, maintained by a cloud database provider. A cloud database is a database that typically runs on a cloud computing platform, such as Amazon EC2, GoGrid and Rackspace.

Databases are repositories for information with links within the information that help make the data searchable.

Best database software cloud report