Accessing segments

The way in which a segment in an HD database is accessed depends on whether the DL/I call for the segment is qualified or unqualified.

Qualified calls
When a call is issued for a root segment and the call is qualified on the root segment's key, the way in which the database record containing the segment is found depends on whether the database is HDAM, PHDAM, HIDAM, or PHIDAM.
Unqualified calls
When an unqualified call is issued for a segment, the way in which the search proceeds depends several different factors.

Parent topic: HDAM, PHDAM, HIDAM, and PHIDAM databases