Implementations of the present disclosure include methods, systems, and computer-readable storage mediums for receiving a key, the key corresponding to an object that is stored in a hybrid memory system, searching a SPLAY tree based on the key to identify a node of the SPLAY tree, determining a type of memory that the object is stored on in the hybrid memory system, the type of memory including one of a first type of memory and a second type of memory, selectively adjusting an endurance counter associated with the object based on a location of the node within the SPLAY tree, and the type of memory that the object is stored on in the hybrid memory system, and selectively migrating the object between the first memory type and the second memory type based on the EC associated with the object.