schematrandata

Hello,

Can somebody help understand the below said:

1. If a user (schema) is dropped and recreated (with the same name), then do we need to re-execute add schematrandata?

2. Under what circumstances would the key column (PK) not get logged? We are observing a strange behaviour where an update is failing with ora-1403 but the data on source & target is same and hence ora-1403 should not be encountered. On reading the trail file, it seems that the key column is not logged (and probably it is a noopupdate, but then we have allownoopupdates on the replicat side, so it should not matter).