3 New Requirements, “Not only SQL” and the Cloud

Relational Database Management Systems (RDBMSs) have their strengths in the fact that they are established and mature systems with a declarative standard language (SQL) that offers complex operations (like joins). A further plus is that RDBMSs can actively check database constraints and the relation schemas ensure that inserted values adhere to the predefined attribute domains. RDBMSs also have an extensive transaction support and an established authorization concept for multiple users; furthermore, they have active components (like triggers) that allow an RDBMS to automatically react to data modifications. Nevertheless, the relational data model and RDBMSs might not be ideal candidates for data ...

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