A software application that enables relational databases to be created, managed and queried. The database management system enables multiple users to access a database through an appropriate interface. As an open source tool, MySQL underpins a number of free software projects, such as WordPress, phpBB and other software built on a LAMP infrastructure. Although widely used, there are a number of performance issues that limit its use in some environments. For example, it is unable to use multiple CPU cores to process a single query, potentially limiting its use as a data warehouse.
A server-side software application that enables databases conformant to a relational data model to be created, managed and queried. Information, most commonly text may be stored as one or more records contained within a table. The table may exist in isolation or have some relationship to other tables. Information may be manipulated using a set of T-SQL or ANSI SQL commands. Several editions of SQL Server are available, including SQL Server Compact, Developer, Embedded, Enterprise, Evaluation, Express and Fast Track.