Concepts › CA IDMS/DB Reorg Reorganization Capabilities › Automatic Reorganization Controlled by Internal Logic

Automatic Reorganization Controlled by Internal Logic

Many of CA IDMS/DB Reorg's capabilities are controlled automatically by its own internal processing logic. For these functions you do not have to enter a parameter or define subschemas. Through its own internal processing logic CA IDMS/DB Reorg has the capabilities to:

• Minimize fragmented records. CA IDMS/DB Reorg does not fragment records unless there is not a page available with enough free space to accommodate the entire record.
• Retarget relocated records to their home page. CA IDMS/DB Reorg automatically retargets relocated records in the area(s) being reorganized.
• Optimize CALC and sorted VIA sets. CA IDMS/DB Reorg allocates CALC and sorted VIA record types in symbolic key sequence. This minimizes the number of page changes required to walk the set; therefore, the number of I/Os performed when searching for a record by its symbolic key can be reduced.
• Rebuild the index structure. When you COPY an area containing an integrated index structure, the index structure is rebuilt automatically. As a result, negative effects of index splits and spawns are eliminated and you can process more efficiently. In addition, the index pointer in the member record is maintained regardless of the record in a non-copy area. Furthermore, the inherent inefficiency of index orphans are eliminated as well.

Minimizing Fragmented Records: