OMS 

Object management system (OMS) is a type of data management.

Only SAP liveCache database instances use OMS:

A large part of the data in an SAP liveCache database instance is managed in objects. This object data is called OMS data. OMS data is managed in containers that are assigned to precisely one persistent C++ class of the object type.

OMS data is edited in the OMS intermediate layer. You can include application logic in the liveCache by using DB procedures. This removes much of the work that would otherwise be needed for communication and the transfer of data.

The OMS data pages are in the data cache.

See also:

Database Administration in CCMS: SAP liveCache Technology, Class Container