Following successful selection and verification of the candidate entity list on the source system, the CORRELATION PROCESSOR (program NDVRDCOR) performs a comprehensive impact analysis on the target system. As input, the Correlation Processor uses a sequential file containing a list of element names and control information produced by NDVRDSEL. Figure 8.2 illustrates the Correlation/Verification cycle.
Impact analysis is performed independently of the actual entity migration. Each entity in the candidate list is checked against the CCDB and the target IDD to ensure that no update activity has occurred to the entities migrating (or to closely related entities) since those entities were last promoted from the source system. In this manner, reversion of applied fixes or parallel development conflicts are captured prior to receiving unexpected results. Any discrepancies can be identified and repaired prior to migration. The process of executing Verification and Correlation may be safely and quickly iterated in the quality assurance phase of promotion.
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