When a record occurrence is stored in the database, it is assigned an identifier, called a database key, based on its physical location within the database. The database key remains the same as long as the record remains in the database.
Each page has an identifying page number. Within the page, each record occurrence is assigned a unique line number. The database key of a record is the combination of the number of the page on which it resides and its line number.
For example, John Done's record occurrence is located on line 3 of page 2525. The database key for his record is 2525/3.
|
Copyright © 2013 CA.
All rights reserved.
|
|