The inability of pure relational DBMSs to meet the new requirements of the applications that have emerged on the web has led to the advent of No SQL DBMSs. In the last few years, significant progress has been made in integrating into relational DBMSs the features that are essential to consider those new requirements that primarily concern flexibility, performance, horizontal scaling, and very high availability. This paper focuses on the features that can enable relational DBMSs to provide applications with the flexibility to work with various non-relational data models while providing the guarantees of independence, integrity, and performance of query evaluation.
The inability of pure relational DBMSs to meet the new requirements of the applications, which have emerged on the web, has led to the advent of NoSQL DBMSs. In recent years, significant progress has been made in integrating into relational DBMSs the features essentials for taking into consideration these new requirements, which mainly concern flexibility, performances, horizontal scaling, and very high availability. This paper focuses on the features, which can enable the relational DBMSs to provide applications with the flexibility to work with various non-relational data models while providing the guarantees of independence, integrity, and performance of query evaluation.