During a warm start of PowerExchange Condense, PowerExchange checks whether the records in the currrent checkpoint file that track the condense files match the records in the CDCT file with the same key fields. If the records in these files do not match, PowerExchange Condense synchronizes the CDCT file with the checkpoint file. Synchronization occurs during the PowerExchange Condense initialization phase only.

During synchronization, if a record is absent from the CDCT file and is present in the checkpoint file, the record from the checkpoint file is added to the CDCT file. However, if a record is absent from the CDCT file and the only corresponding record in the checkpoint file is a compressed RET record, PowerExchange cannot add the missing record to the CDCT file.

For each missing CDCT record that the synchronization process detects, PowerExchange issues warning message PWX-06446 and optionally issues the operator reply message PWX-06449. You must reply Y or N to the operator reply message to indicate whether to continue or end PowerExchange Condense processing. If PowerExchange Condense continues, some change data will not be extracted because the extraction processes will not be able to find all of the condense files based on the CDCT records. If you do not need to extract change data for the registrations and time stamps reported in the PWX-06446 messages for missing CDCT records, you can suppress the operator reply messages by setting the OPER_WTOR_ENABLED parameter to N in the CAPTPARM configuration member.

Under normal circumstances, the checkpoint file and CDCT file match. However, if the synchronization process detects that the records in these files differ, the records in the checkpoint file take precedence until a subsequent PowerExchange Condense warm start resynchronizes the files. In the following atypical situations, resynchronization might be necessary: