An index term, subject term, subject heading, or descriptor, in information retrieval, is a term that captures the essence of the topic of a document.
Index terms make up a controlled vocabulary for use in bibliographic records.
Index terms can consist of a word, phrase, or alphanumerical term.
How do you define an index?
An index is a structure maintained by a persistent class that Caché can use to optimize queries and other operations. You can define an index on the values of a field within a table, or the corresponding property within a class. (You can also define an index on the combined values of several fields/properties.)
What is the index of the book?
An index is essentially a roadmap to the book, listing names, places, and things in alphabetical order and giving the page numbers associated with each topic. For nonfiction books, packed with valuable information, a well-made index can help quickly direct the reader to the information they’re trying to find.
What is an index and what is it used for?
Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.