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DB2 Universal Database 
Up and Running with DB2 for Linux MySQL to DB2 UDB Conversion Guide
DB2 UDB Evaluation Guide for Linux and Windows DB2 UDB V8 and WebSphere V5 Performance Tuning
DB2 Application Development Guide [Java Applications] DB2 and Java - The Big Picture
DB2 Connectivity for Application Developers [Introduction] [For iSeries] [For z/OS] [For ADO and ADO.NET ]
DB2 Java Stored Procedures by Examples DB2 Cookbooks Download [Online Manual]
IBM DB2 Universal Database for .NET Developer (P. Zikopoulos) [Part 2] [Part 3] [Part 4]
DB2 UDB version 8.x Manuals [Version 7.x]