Delta replication

A system comprising:

• at least one programmable processor;
• and
• a machine-readable medium storing instructions that, when executed by the at least one programmable processor, cause the at least one programmable processor to perform operations comprising:
• identifying, based on a received data query, at least one attribute of stored data for replication in response to the received data query, the at least one attribute corresponding to at least one parameter of the received data query, wherein the at least one attribute corresponds to a field attribute in a segment of stored data, the field attribute including at least one of the following:
• a delta irrelevant field attribute for excluding at least one field in a segment for determining a delta difference, an exclusion field attribute for excluding all fields in a segment for determining the delta difference, and a mandatory field attribute for requiring replication of all fields of a segment regardless of the determination of the delta difference;
• retrieving data stored at a first time and data stored at a second time, the second time being subsequent to the first time;
• comparing the data stored at the first time and the data stored at the second time to determine the delta difference between the data stored at the first and second times;
• selecting the determined delta difference for the at least one identified attribute;
• and
• replicating the selected computed delta difference in response to the received query.

A computer program product comprising a non-transitory machine-readable medium storing instructions that, when executed by at least one programmable processor, cause the at least one programmable processor to perform operations comprising:

• identifying, based on a received data query, at least one attribute of stored data for replication in response to the received data query, the at least one attribute corresponding to at least one parameter of the received data query, wherein the at least one attribute corresponds to a field attribute in a segment of stored data, the field attribute including at least one of the following:
• a delta irrelevant field attribute for excluding at least one field in a segment for determining a delta difference, an exclusion field attribute for excluding all fields in a segment for determining the delta difference, and a mandatory field attribute for requiring replication of all fields of a segment regardless of the determination of the delta difference;
• retrieving data stored at a first time and data stored at a second time, the second time being subsequent to the first time;
• comparing the data stored at the first time and the data stored at the second time to determine the delta difference between the data stored at the first and second times;
• selecting the determined delta difference for the at least one identified attribute;
• and
• replicating the selected computed delta difference in response to the received query.