US Patent 7860848 Partial sub-lock for delta object management

A system may include creation a first database object associated with a primary key and a first delta ID m, association of a first pointer with the first database object, creation of a data structure associating the first pointer with a first index m, a second index m and a delta object map, determination of a request from a transaction to change a database object associated with the first pointer, incrementing of the first index of the data structure, creation of a second database object associated with the primary key and a second delta ID m+1, the second database object being associated with a change to the first database object, and modification of the delta object map to indicate the second database object.