How to: Reference: |
If you are using certain network or hierarchical data sources such as IMS, CA-IDMS/DB, or FOCUS, you can rotate the data source, creating an alternate view which changes some of the segment relationships and enables you to access the segments in a different order. By reporting from an alternate view, you can do the following:
It should be noted that retrieval is controlled by the minimum referenced subtree. For more information, see Understanding the Efficiency of the Minimum Referenced Subtree in the Describing a Group of Fields chapter in the Describing Data With WebFOCUS Language manual.
For example, consider the regular and alternate views below:
Since C is the root segment in the alternate view, particular instances of C can be selected faster.
WebFOCUS |