DataStage is an ETL(Extract Transform and Load) tool while quality stage is a cleansing tool. Prior to IBM information Integration server (V8) Ascential datastage was used purely for ETL and quality stage for cleansing and quality stage jobs used to be called in datastage jobs using plugins...drawbacks of the same: performance, different user interface...
These drawbacks are taken care by the IIS (V8) which has got datastage and quality stage sharing the same meta data layer so performance is increased n there is no plugin as quality stage stages are also on the same designer pallate as datastage.
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