CA IDMS/DB Reorg performs a physical reorganization of all or part of the database, leaving logical relationships between records, and the size and content of each record, unchanged. The reorganization is controlled by user-specified parameters, the definition of the subschemas, and the utility's own internal logic. Because CA IDMS/DB Reorg reorganizes a database by copying the old area to the new area, you must identify both the old subschema and the new subschema when you execute CA IDMS/DB Reorg. Any changes made to the database through the definition of the new subschema are reflected in the reorganized database.
CA IDMS/DB Reorg exploits CA IDMS/DB's I/O features:
For more information on these CA IDMS database features, see the CA IDMS Database Administration Guide and CA IDMS System Operations Guide.
In addition, the SYSIDMS PREFETCH parameter for read-ahead processing by CA IDMS engine, replaces the read-ahead processing previously provided by FASTSCAN and EXCP I/O level processing formerly specified in the GSDTPARM installation defaults.
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