Datastage 8.x OverviewDatastageData warehouse Each activity we perform or event that occurs is considered as data Useful data is information. Modern organization is drowning in data but starving for information. So, Data warehouse can be defined as collection of information which is Subect oriented!ntegrated"ime variant#on volatileData warehouse supports decision ma$ing.DatastageData warehouse !n the process of building the data warehouse and using it to ma$e the decisions, we have the below two steps.ETLReporting E"% stands for E&tract Transform and Load Reporting is to 'uery the information from the data warehouse and present in the form of reports which helps business to ta$e the decisions. Datastage steps in here as an E"% tool.DatastageDatastage!s a data transformation tool which is popular as E"% tool.(llows to build E"% process in a graphical style which is $nown as ob.DatastageHistory )irst version released in #ovember *+ of *,,- by !ar" )irst user Eurotunnel .Mar$ ac'uired its main competitor in the /!012on2U#!3 mar$et, UniData, and formed #r$ent %o&tware. In&or!ix ac'uire$ #r$ent %o&tware on March * 4555 for a share swap worth 6*.* billion. In&or!ix reorgani(e$ into two divisions, databases, and everything else including data integration. !n 455* !nformi& sold the database division to !7M. "he remaining company was renamed (scential Software. #scentia) ac'uire$ Torrent %yste!s for the parallel engine, .ality for its data 'uality technology,*etagenix data profiling technology*ercator for its mar$etplace8transaction8transformationsDatastageI+* In&or!ation %erver Overview!7M !nformation Server combines the technologies within the !7M !nformation !ntegration Solutions. 0ombines the capabilities of 9ebSphere DataStage, 9ebSphere :ualityStage, 9ebSphere !nformation (nalyzer, 9ebSphere 7usiness ;lossary,9ebSphere !nformation Services Director, and 9ebSphere )ederation Server technologies into a single unified platform.S to apply to data.0an have a single input and any number of outputs along with reect lin$Unli$e most of the other stages "ransformer stage has its own user interface.?andling null values in input columns (n input column is used in an output column derivation e&pressionD DS%in$E.col* F * (n input column used in an output column constraint. (n input column is used in a stage variable derivation.Datastage,o!.ination o& 6ive %tages"ransformer constraints G filter stage"ransformer metadata conversion G Modify stage"ransformer copy of fields and multiple outputs G 0opy stage"ransformer creation of new fields G 0olumn ;enerator stage"ransformer counters G Surrogate 1ey StageDatastage%tage page ;eneral. (llows you to enter an optional description of the stage. .ariables. (llows you to set up stage variables for use in the stage. Surrogate 1ey. (llows you to generate surrogate $eys that can be used in comple& loo$up and update operations. (dvanced. (llows you to specify how the stage e&ecutes. %in$