DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopXML or Relational?XML or Relational• Model is hierarchical in nature.• Data is self describing. A singledocument can contain multiple typesof data.• The data contains an inherentordering.• More tolerant of structure / schemachanges.• Parsing and publication(serialization) costs involved inprocessing the data.• Model is flat. Structure can beachieved through parent / childrelationships.• Data is not self describing. Datacontent is described by the columndefinition.• Data is not ordered, unless explicitlyrequested.• Fairly rigid implementation of thedata.• Provides optimal performance.• Also consider the type of data / processing expected by downstreamprocesses.• Does the data need to be updated often, and with what granularity?• Is referential integrity needed?44© 2011 IBM Corporation