(Craig S. Mullins) A null represents missing or unknown information at the column level. If a column “value” can be null, it can mean one of two things: the attribute is not applicable for certain occurrences of the entity, or the attribute applies to all entity occurrences, but the information may

BluePhoenix Solutions, the leader in Enterprise IT Modernization, announced that, utilizing its DBMSMigrator tool, it has successfully completed a large-scale IDMS to DB2 database and application migration project. The project, part of a two-year multi-million dollar contract, was done for a promine

(K. Miller, A. Beaubien, M. Betancourt, A. Black, M. Casile, D. Draeger, M. Everett, T. Gissel, M. Herescu, R. Iyer, K. McGuinnes, D. Patel and Y. Tang) Learn how to keep IBM WebSphere running smoothly, and anticipate problems before they happen. Preventative procedure is the watchword in this chapt

(Paul C. Zikopoulos) In a side-by-side comparison table, the author makes it simple to understand the basic licensing rules, functions, and feature differences between the members of the distributed DB2 Universal Database (DB2) server family.

(Robin Schumacher) In a 2004 market share study by Gartner, IBM continued to be the database market leader for the second year in a row with a 33.8 percent share. IBM is forging ahead with its DB2 RDBMS offering on a variety of hardware and software platforms with significant new releases in 2004 f

(Inge Halilovic) For IBM Informix Dynamic Server, Version 10.0, information retrieval from the documentation set has been improved by the addition of an Information Center that contains HTML and PDF versions of the product manuals, a master index, full text search capabilities, and resources for tro

(Bonnie Baker) While I was talking with a programmer about locking contention and overhead one day, I mentioned table and table space locking. She looked at me and in all innocence said, “Oh, we don’t ever use table space or table locking here. We only use page locking.”

(Justin Whitney) When it comes to stored procedures, there seem to be three kinds of developers: those who love them, those who hate them, and those who don’t really know what the heck they are. DBAs usually fall into the first category, coders in the second, scripters in the third (as a former scri

(Juan Rodriguez, George Kroner, Gianfranco Rutigliano, Sung-Ik Son and Guillermo Villavicencio) This IBM Redbook is part of a series of four volumes related to WebSphere Everyplace Access Version 5.0. These Redbooks will help you plan, install, administer and develop mobile applications to run in a

(Michael Cairns) As a Resource Access Control Facility (RACF) security administrator and occasional systems programmer, I’m often asked why a job, started task, or user ID has lost access, stopped working or won’t start when it was “working perfectly yesterday” and the customer “changed nothing.” Wh