Abstract: Embodiments include a computer-implemented method including identifying, by a primary computer device, a plurality of records, each record having one or more attributes; standardizing, by the primary computer device, each of the plurality of records; assigning, by the primary computer device, an index to one or more of the one or more attributes; providing, by the primary computer device, instructions for clustering the standardized plurality of records in parallel into one or more clusters, each cluster including records having the same index, the one or more clusters being in a group; receiving, by the primary computer device, one or more groups, each group including one or more clusters sharing a same index; and linking one or more of the plurality of records in a cluster with another one or more of the plurality of records in another cluster within a same group.

Abstract: Corruption of program stacks is detected by using guard words placed in the program stacks. A called routine executing on a processor checks a guard word in a stack frame of a calling routine. The checking determines whether the guard word has an expected value. Based on determining the guard word has an unexpected value, an indication of corruption of the stack frame is provided. Some routines, however, may not support use of guard words. Thus, routines that are interlinked may have differing protection capabilities. In this situation, a determination may be made as to whether a caller routine supports guard word protection. Based on determining that the caller routine supports guard word protection, the called routine verifies the guard word.