Interface Navigation

To retrieve the necessary records that fulfill a request, the ADABAS Interface navigates the ADABAS database through direct calls in read only mode. The calls generated depend on three factors:

• The information supplied in the Master File.
• The information supplied in the Access File for a specified segment.
• The particulars of the report request.

The Interface uses information from these sources to choose the most appropriate and efficient retrieval method.

There are three logical types of ADABAS access:

• Entry segment retrieval of ADABAS records.
• Retrieval of descendant periodic groups and multi-value fields.
• Retrieval of descendant ADABAS records.

This chapter explains the strategies behind each of the above logical types.

• Entry Segment Retrieval of ADABAS Records
• Descendant Periodic Groups and Multi-value Fields
• Descendant ADABAS Records