The linkage options for an index set are different than those for a chain set. The owner of an index set always points to the index structure and not the first member record occurrence. The pointers maintained in the member record differ depending on whether the index is user- or system-owned.
In a user-owned index, member record occurrences always point into the index structure. This is called an INDEX pointer. Member records may also optionally point to the owner record occurrence (OWNER pointers).
In a system-owned index, member records never point to the owning SYSTEM record and may or may not point into the index structure depending on whether the index is defined as linked or unlinked:
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