When working with Oracle GoldenGate, you might need to refer to the checkpoints that are made by a process. Checkpoints save the state of the process for recovery purposes. Extracts and Replicats use checkpoints.
Extract checkpoint positions are composed of read checkpoints in the data source and write checkpoints in the trail. The following is a sampling of checkpoint information displayed with the INFO EXTRACT command with the SHOWCH option. In this case, the data source is an Oracle RAC database cluster, so there is thread information included in the output. You can view past checkpoints by specifying the number of them that you want to view after the SHOWCH argument.