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Takes the output DBRM and evaluates the database catalog to determine the most efficient access paths (using indexes or tablespace scans). It creates a compiled execution blueprint known as a Package or a Plan .

Key-Sequenced (KSDS), Entry-Sequenced (ESDS), Relative-Record (RRDS), and Linear Data Sets (LDS). mainframe refresher by muthu pdf link

Occur when a new record insertion lacks space within the designated CI or CA, forcing VSAM to allocate a new interval/area and split the data. Minimizing splits via proper IDCAMS tuning is vital for database health. 5. Online Processing: CICS and DB2 Database Systems Takes the output DBRM and evaluates the database