A BMC AMI Recovery Manager object set is a set of table spaces and indexes (usually belonging to the same application) that are grouped together in order to perform common backup and recovery procedures.
Grouping in object sets simplifies the backup and recovery process because you can use the generated JCL to back up or recover the entire group at once. It also simplifies the specification of backup and recovery options because you can specify the options just once for the entire object set.
You can build and process object sets by using the online interface or by using batch programs. Using the batch program is faster for creating object sets that contain more than a few hundred objects.
Whenever possible, you should build your object sets before a backup or recovery becomes necessary. In the case of a recovery to a prior point in time, you should ensure that indexes and objects that are related by referential integrity are included in the object set.