Database allocation

There are four considerations when allocating DASD space for the database.
  1. What records are needed?
  2. How much space will they occupy?
  3. Which records need backup copies?

    Backup copies are often referred to as duplicates, or more simply, dupes. All records, some records, or no records may have duplicates. Whether records are duplicated is determined by the overall DASD duplication scheme (whether the system is fully, selectively, or nonduplicated).

  4. Where will the records be located?

    Each record group must have a specific and unique address assigned to it.

The allocation of records on all online modules in the same device type (DEVA, B, C, and D) is identical.

See Keypoint records for the allocation of the keypoint area.