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Encyclopedia of Database Systems pp 449Cite as

Connection

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  • 49 Accesses

Synonyms

Database socket

Definition

A connection is a mechanism that allows a client to issue SQL commands to a database server. In a typical usage, the client software opens a connection to the database server, and then sends SQL commands and receives responses from the server.

To open a connection, the client specifies the database server, database name, as well as the client's credentials. Opening the connection includes a handshake between the client software and the database server. The client sends its credentials, for example in the simplest form a user name and password. The server examines the credentials to authorize the connection. Further information may also be negotiated such as the specific protocol and data encoding.

Key Points

Handling and servicing connections is an important part of database servers because connections are the main source of concurrency.

Database servers limit the number of connections they can accept and may provide differentiated service to...

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Recommended Reading

  1. Adya A., Blakeley J., Melnik S., and Muralidhar S. Anatomy of the ADO.NET entity framework. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 2007, pp. 877–888.

    Google Scholar 

  2. Data Management: SQL Call Level Interface (CLI), Technical Standard C451–15/10/1993, The Open Group.

    Google Scholar 

  3. Sun Microsystems, Java Database Connectivity. Available at: http://java.sun.com/javase/technologies/database/

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Author information

Authors and Affiliations

  1. Microsoft Research, Cambridge, UK

    Sameh Elnikety

Authors
  1. Sameh Elnikety
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Elnikety, S. (2009). Connection. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_666

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