Character large object

Character large object

A Character Large Object (or CLOB) is a collection of character data in a database management system, usually stored in a separate location that is referenced in the table itself. Oracle and IBM DB2 provide a construct explicitly named CLOB, and the majority of other database systems support some form of the concept, often labeled as text, memo or long character fields.

CLOBs usually have very high size limits, on the order of 2GB or more. The tradeoff for the capacity is usually limited access methods. In particular, some database systems limit certain SQL clauses, such as LIKE or SUBSTRING from being used on CLOBs.

Alternative methods of accessing the data are often provided, including means of extracting or inserting ranges of data from the CLOB.

Database systems vary in their storage patterns for CLOBs. Some systems always store CLOBs as a reference to out-of-table data, while others store small CLOBs in-table, changing their storage patterns when the size of the data grows beyond a threshold. Other systems are configurable in their behavior.

CLOBs are distinguished from BLOBs by having a specified character encoding.

See also

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Character Large Object — (CLOB) ist ein Datentyp, der verwendet wird, um sehr lange Zeichenketten in Datenbanken zu speichern. Dieser Datentyp wird in verschiedenen Datenbanksystemen unterschiedlich genannt. In Oracle und DB2 heißt er CLOB, während andere… …   Deutsch Wikipedia

  • Character large object — Le type CLOB ou Character Large Object est un type de donnée permettant le stockage de données à base de caractères (pas comme le BLOB) dans le champ d une table d une base de données. Portail des bases de données …   Wikipédia en Français

  • Binary large object — A blob (alternately known as a binary large object, basic large object, BLOB, or BLOb) is a collection of binary data stored as a single entity in a database management system. Blobs are typically images, audio or other multimedia objects, though …   Wikipedia

  • Binary Large Object — Binary Large Objects (BLOBs) sind große binäre Objekte wie Bild oder Audiodateien. Der Begriff wird häufig im Zusammenhang mit Open Source Projekten und Datenbanken benutzt. Freie Software und Open Source Projekte Im Rahmen des Open Source wird… …   Deutsch Wikipedia

  • Character — • A consideration of the term as it is used in psychology and ethics Catholic Encyclopedia. Kevin Knight. 2006. Character     Character     † …   Catholic encyclopedia

  • Character animation — is a specialized area of the animation process concerning the animation of one or more characters featured in an animated work. It is usually as one aspect of a larger production and often made to enhance voice acting. The primary role of a… …   Wikipedia

  • Character mask — Part of a series on Marxism …   Wikipedia

  • Object recognition (computer vision) — Feature detection Output of a typical corner detection algorithm …   Wikipedia

  • Character fighting techniques (Ranma ½) — This article cover fighting techniques used by characters in Ranma ½ that are not practitioners of Musabetsu Kakutō Ryū.Independent regular characters =Ryoga= Ryoga is an exceptionally proficient martial artist, roughly comparable to Ranma, whom… …   Wikipedia

  • Character encodings in HTML — For a list of character entity references, see List of XML and HTML character entity references. HTML HTML and HTML5 Dynamic HTML XHTML XHTML Mobile Profile and C HTML Canvas element Character encodings Document Object Model Font family HTML… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”