You can use set_tag.
Every redo entry in the redo log has a tagassociated with it.
You can control the value of the tags generated in the redo log in the following ways:
1. Use the DBMS_STREAMS.SET_TAG procedure to specify the value of the redo tags generated in the current session. When a database change is made in the session, the tag becomes part of the redo entry that records the change. Different sessions can have the same tag setting or different tag settings.
2. Use the CREATE_APPLY or ALTER_APPLY procedure in the DBMS_APPLY_ADM package to control the value of the redo tags generated when an apply process runs. All sessions coordinated by the apply process coordinator use this tag setting. By default, redo entries generated by an apply process have a tag value that is the hexadecimal equivalent of '00' (double zero).
You may also configure DML handlers to discard any changes at apply.