Volume and Dataset Relations

The Media Database Data file contains a record for each volume and a record for each dataset. Fields in these records, and indexes of various types, are used to describe the relationships between a volume and its respective datasets. These fields and indexes also describe the relationship between volumes in a multi‑volume chain.

The examples below show the relationship between the relevant fields in the volume records, dataset records, and the index elements that reference these records.

Example: This example shows the record and index configuration for a single volume (VVV) containing only one dataset (called A.B).

Figure 76 Volume and Dataset Relations – Example 1

Example: This example shows the record and index configuration for a single dataset (A.B) that spans two volumes (VVV and XXX).

Figure 77 Volume and Dataset Relations – Example 2

Example: This example shows the record and index configuration for a group of datasets (A.B, A.C, and A.D) contained in a multi‑volume chain (volumes VVV and XXX). Dataset A.B resides on volume VVV. Dataset A.C starts on volume VVV and continues on volume XXX. Dataset A.D resides on volume XXX.

Figure 78 Volume and Dataset Relations – Example 3