Object databases

Each Object storage group has one object database. Each object database requires eight separate VSAM linear data sets. These data sets are for the object directory and its three indexes, the small object table and its index, and the large object table and its index. These data sets are explicitly allocated to give you control over data set placement and size. This control allows you to take full advantage of your configuration to optimize system and DASD I/O performance. (See Figure 1 for a diagram of an object database.)

Before attempting to estimate your DASD requirements, you must have completed the business analysis process by establishing the following:

Object grouping for all objects to be handled by OAM
Object sizes within each Object storage group
Number of objects to be stored in DB2 databases for each Object storage group

Tip: Object Backup storage groups do not use the object database. Backup information for each object is kept in the object database for the primary Object storage group.