A method and system for managing data clusters is provided. A first data cluster is generated having a first data object and a second data object. The first data cluster has a strict hierarchy between the first data object and the second data object. A first object reference from the first data object to the second data object is extracted. The first object reference is stored in a first reference container. A second object reference from the first data object to a third data object is extracted. The third data object is stored in a second data cluster. The second object reference is stored in a second reference container. The second object reference is stored in a second reference container. A memory access is provided to the first data cluster based on the first object reference and the second object reference.