DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopIndex on Expression• Simple indexes can containconcatenated columnscreate index totalComp onW2_TABLE(salary, bonus)• Index on expression– Value of the index has beentransformed– May not be the value of any ofthe columns that it is derivedfrom– Optimizer can use this indexCreate index totalComp onW2_TABLE(salary+bonus)W2_TABLEname salary bonusGary 20,000 500Paul 40,000 5,000Matt 400,000 10,000Rex 40,000 2,000Rob 200,000 210,000Query / Order on Total Compensation164© 2011 IBM Corporation