CA IDMS/DB Reorg fragments a variable length record only when the record is too large to be stored on the target page and there is no other page where the entire record fits. The fragmentation is kept to a minimum by keeping record fragments as large as possible and storing them on as few pages as possible.
Record fragments are not allocated until all target page allocations have been made. This ensures that a fragment from one record will not cause a second record to fragment or overflow from its target page.
When an entire record will not fit on the target page, CA IDMS/DB Reorg, under your direction, creates a minimum of one fragment for CALC and sorted VIA record types even though there is a page somewhere in the record's page range with enough free space to accommodate the complete record. The TARGETROOT parameter provides control in these situations. See TARGETROOT Parameter.
|
Copyright © 2014 CA.
All rights reserved.
|
|