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A cloud database is a database that typically runs on a cloud computing platform. 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. Of the databases available on the cloud, some are SQL-based and some use a NoSQL data model. == Deployment models == There are two primary methods to run a database in a cloud: * 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. 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. For example, Oracle provides a ready-made machine image with an installation of Oracle Database 11g Enterprise Edition on Amazon EC2〔(Amazon Machine Images - Oracle Database 11g Release 2 (11.2.0.1) Enterprise Edition - 64 Bit ), (Amazon Web Services ), Retrieved 2011-11-9.〕 and on Microsoft Azure.〔(List of Oracle VM Images (MSDN) ), Retrieved 2014-9-22〕 * Database as a service (DBaaS) - some cloud platforms offer options for using a database as a service, without physically launching a virtual machine instance for the database. In such a configuration, application owners do not have to install and maintain the database themselves. Instead, the database service provider takes responsibility for installing and maintaining the database, and application owners pay according to their usage. For example, Amazon Web Services provides three database services as part of its cloud offering: SimpleDB, a NoSQL key-value store; Amazon Relational Database Service, a SQL-based database service with a MySQL interface; and DynamoDB. Similarly, Microsoft offers the Azure SQL Database service 〔(Azure SQL Database (MSDN) ), Retrieved 2014-9-22〕 as part of its cloud offering. A third option involves managed database-hosting in the cloud, where the cloud database vendor does not offer the database as a service, but hosts the database and manages it on the application owner's behalf. For example, cloud provider Rackspace offers managed hosting for MySQL on dedicated〔(MySQL Server Support at Rackspace ), (Rackspace.com ), Retrieved 2014-02-24.〕 and cloud architectures〔"(MySQL Databases on the Cloud at Rackspace )", (Rackspace.com ), Retrieved 2014-02-24.〕 and NoSQL databases via Object Rocket's managed MongoDB service.〔"(Managed MongoDB at Rackspace )", (Rackspace.com ), Retrieved 2014-02-24.〕 Similarly, on Azure〔"(MongoLab on Azure )", Retrieved 2015-01-26〕 and on Amazon Web Services,〔"(MongoLab on AWS )", Retrieved 2015-01-26〕 MongoLab provides MongoDB-as-a-Service. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cloud database」の詳細全文を読む スポンサード リンク
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