Each object stored in the OAM storage hierarchy is part of a collection and is assigned a storage class and management class. These assignments are recorded in the object’s directory entry. To conserve DASD space, OAM stores an identifier that represents those names instead of recording the names in each directory entry. OAM requires two tables to relate the identifiers to the storage class and management class names, and a third table to describe collections (see Figure 1). Table 1 through Table 1 are used for diagnostic reference.

Figure 1. Object Administration Database Structure