Checkpoints and journals from your original Ingres version will not work with the newer version, so do not omit or delay this step.

Checkpoint each database, including the iidbdb. If the database was journaled previously, use the +j flag to turn on journaling.

To know which databases were journaled, see the infodb output from the step Record Database Information.

The iidbdb should always be journaled, regardless of whether it was journaled in the original installation.