8 Chapter 8. Analyzing database performance data with Visual Explain The launch of Visual Explain with iSeries Navigator Version 4, Release 5, Modification 0 (V4R5M0) in DB2 Universal Database for iSeries was of great interest to database administrators working in an iSeries server environment. This feature has been described as a quantum leap forward in database tuning for query optimization. Visual Explain provides an easy-to-understand graphical interface that represents the optimizer implementation of the