The page reserve value specified by parameter affects only allocation of VIA and physical sequential records. (For more information on the PAGERESERVE parameter, see PAGERESERVE Parameter.)
The page reserve is ignored for CALC records because CA IDMS/DB Reorg will not overflow a CALC record unless absolutely necessary. This conserves I/Os significantly because every CALC record that overflows requires at least two I/Os of system overhead.
This parameter-defined page reserve overrides the value coded into the DMCL. This means you do not have to define a separate DMCL with a page reserve to run CA IDMS/DB Reorg. In addition, it is not necessary to recompile to resume normal database operations after CA IDMS/DB Reorg has executed.
User-Defined Clustering:
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