Need help identifying unique identifiers in oracle golden gate replication

Need help to uniquely identify records in Oracle Golden Gate target tables. I am using OGG for change detection where every insert/delete in source table insert a record in target table and for every update it insert two records in target tables as before and after. Now i need unique identifier for every insert/delete/update and two record which was updated should have same identifier.


For easy understanding i am posting below table. I need unique identifier which can be @GETENV ('RECORD', {'FILESEQNO'|'FILERBA'|'ROWID'|'RSN') or @GETENV ('GGHEADER', {'LOGPOSITION'| 'LOGRBA'}) . But i am not able to understand which is correct one as per my requirement as LOGPOSITION,RSN repeating.FILERBA was different for BEFORE and AFTER value in case of update.




EMP_ID DEPT_ID EMP_NAME TRAN_TYPE BEFORE_AFTER UNIQUE IDENTIFIER
100 1067 Reshma SQL COMPUPDATE BEFORE IDENTIFIER-1
100 956 Reshma SQL COMPUPDATE AFTER IDENTIFIER-1
300 953 Adir SQL COMPUPDATE BEFORE IDENTIFIER-2
300 953 Adira SQL COMPUPDATE AFTER IDENTIFIER-2
500 1067 Suhani INSERT AFTER IDENTIFIER-3
600 857 Raj SQL COMPUPDATE BEFORE IDENTIFIER-4
600 345 Raj SQL COMPUPDATE AFTER IDENTIFIER-4
800 907 Basant DELETE BEFORE IDENTIFIER-5