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Database servers are usually multiprocessor computers, with generous memory and RAID disk arrays used for stable storage.RAID is used for recovery of data if any of the disks fail.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.Since DBMSs comprise a significant market, computer and storage vendors often take into account DBMS requirements in their own development plans.This article is concerned only with databases where the size and usage requirements necessitate use of a database management system.Physically, database servers are dedicated computers that hold the actual databases and run only the DBMS and related software.A common example is an email system that performs many of the functions of a general-purpose DBMS such as the insertion and deletion of messages composed of various items of data or associating messages with a particular email address; but these functions are limited to what is required to handle email and don't provide the user with all of the functionality that would be available using a general-purpose DBMS.

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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.A relational database, more restrictively, is a collection of schemas, tables, queries, reports, views, and other elements.Database designers typically organize the data to model aspects of reality in a way that supports processes requiring information, such as (for example) modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.Application programmers may use a wire protocol directly, or more likely through an application programming interface.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.

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