During installation, PowerExchange creates the CDCT file and initializes it with a high values (9s) record.

After each file switch, PowerExchange Condense performs the following processing:

Closes the condense files.
Inserts keyed tracking records with information about each condense file into the CDCT file. These records contain the following information:
The condense file name
Whether the file is a partial or full condense file
The start and end times
Whether before images are included
The number of records in the file
The source instance, registration tag, and sequence token fields.
Other control information
Writes a new checkpoint to the checkpoint file. Also writes the CDCT tracking records to the checkpoint file.

Each time a Condense job warm starts, PowerExchange Condense synchronizes the tracking records in the checkpoint file to the CDCT file. If necessary, PowerExchange Condense inserts tracking records into the CDCT file or removes tracking records from the CDCT file to ensure that the checkpoint file and CDCT file match.