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Since DBMSs comprise a significant market, computer and storage vendors often take into account DBMS requirements in their own development plans.Databases and DBMSs can be categorized according to the database model(s) that they support (such as relational or XML), the type(s) of computer they run on (from a server cluster to a mobile phone), the query language(s) used to access the database (such as SQL or XQuery), and their internal engineering, which affects performance, scalability, resilience, and security.The DBMS provides various functions that allow entry, storage and retrieval of large quantities of information and provides ways to manage how that information is organized.

DBMSs may be built around a custom multitasking kernel with built-in networking support, but modern DBMSs typically rely on a standard operating system to provide these functions.A database is not generally portable across different DBMSs, but different DBMSs can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one DBMS.Computer scientists may classify database-management systems according to the database models that they support; the most popular database systems since the 1980s have all supported the relational model - generally associated with the SQL language.Some general-purpose DBMSs such as Adabas, Oracle and DB2 have been upgraded since the 1970s.General-purpose DBMSs aim to meet the needs of as many applications as possible, which adds to the complexity.Databases are used to support internal operations of organizations and to underpin online interactions with customers and suppliers (see Enterprise software).Databases are used to hold administrative information and more specialized data, such as engineering data or economic models.Database designers and database administrators interact with the DBMS through dedicated interfaces to build and maintain the applications' databases, and thus need some more knowledge and understanding about how DBMSs operate and the DBMSs' external interfaces and tuning parameters.Following the technology progress in the areas of processors, computer memory, computer storage, and computer networks, the sizes, capabilities, and performance of databases and their respective DBMSs have grown in orders of magnitude.However, since their development cost can be spread over a large number of users, they are often the most cost-effective approach.On the other hand, a general-purpose DBMS may introduce unnecessary overhead.

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