Sybase An enterprise software and services company offering software to manage, analyze, and mobilize information, using relational databases, analytics and data warehousing solutions and mobile-application development platforms. Sybase is a standalone subsidiary of SAP.
HANA allows data analysts to query large volumes of data in real-time. HANA’s in-memory database infrastructure frees analysts from having to load or write-back data. HANA’s columnar-based data store is ACID compliant and supports industry standards such as structured query language (SQL) and multi-dimensional eXpressions (MDX).
DB2 A family of database server products developed by IBM. These products all support the relational model, but in recent years some products have been extended to support object-relational features and non-relational structures, in particular XML.
Informix One of the world’s most widely used database servers, with users ranging from the world’s largest corporations to start-ups. Informix incorporates design concepts that are significantly different from traditional relational platforms, resulting in extremely high levels of performance and availability, distinctive capabilities in data replication and scalability, and minimal administrative overhead.
Microsoft SQL A software product whose primary function is to store and retrieve data as requested by other software applications, be it those on the same computer or those running on another computer across a network (including the Internet). There are at least a dozen different editions of Microsoft SQL Server aimed at different audiences and for workloads ranging from small single-machine applications to large Internet-facing applications with many concurrent users. Its primary query languages are T-SQL and ANSI SQL.
Oracle The Oracle Database (commonly referred to as Oracle RDBMS or simply as Oracle) is an object-relational database management system  produced and marketed by Oracle Corporation.