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This Week @ the MC Press Bookstore

April 17, 2013 | Volume 12 Issue 8

ISSUE HIGHLIGHTS

TOP STORY: Introduction to Database Constraints
FEATURED ARTICLE: What You Should Know About the Format of Records Saved to a Save File
NEWS HIGHLIGHT: Profound Logic Software Releases Profound UI Version 4.5
TRIAL SOFTWARE: TRY MarkMagic to Solve All Your Document Design and Printing Challenges
EVENT: Northeast User Groups Conference 2013

Feature Article - Programming
 
Introduction to Database Constraints

This article is an excerpt from Chapter 5, "Database Constraints," of Database Design and SQL for DB2 (MC Press, 2013).

Written by James Cooper

Constraints, sometimes referred to as integrity constraints or integrity rules, are restrictions based on business rules and other business policies and procedures that ensure data in a database are acceptable and accurate.

 

A DBMS can provide features that can be used to specify integrity constraints.


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Feature Article - Programming
 
What You Should Know About the Format of Records Saved to a Save File

When a file contains variable-length fields, the data of the fixed-length fields of its deleted records can still be retrieved.

juan maciasWritten by Juan Macias

A known technique to retrieve the records deleted from a file consists of saving the file to a save file and extracting the records from the save file. This technique is based on the fact that, in many cases, the records of the file are stored in the save file maintaining their format, apart from a status byte added by the system at the beginning of each record.


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