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OCR: Heavy Transaction Ad Hoc Processing Processing Summary Levet 3 POISGARI DB Summary Summary ( Mainframe) Level 1: Level 2 Mainframe Data definition Integration. validation. Detall Data summarization. Personal OB Legacy Systems & cleanup Data Dictionary Nonrelations! & Relationat Model Repository Dictionary Moder Repository Shared DB Mainframe DB2 Archive Oktay FIGURE 1. Multilevel data architecture.