dbvrep> LIST TRANSACTIONS
This commands shows the Transaction ID of the SQL that is uncommitted on APPLY.
The transaction list will also include internal non committed transaction not related to the replication.
Run the list transaction command repeatedly with about 1-2 seconds apart. Only if the same transactions ID stays after repeatedly running this command, then this is worthy of investigation.
The Transaction ID is the hex value of the combined columns XIDUSN, XIDSLOT, XIDSQN from v$transaction on the source database. The Transaction ID is also set in columns MODULE and ACTION from V$SESSION on the target database.
To find the actual SQL statement run the following query and match the Transaction ID (run on source database):
SQL> select inst_id, to_char(XIDUSN, 'xxxxxxxx'), to_char(XIDSLOT,'xxxxxxxx'), to_char(XIDSQN,'xxxxxxxx') from gv$transaction;
Use v$transaction on Non RAC systems instead of gv$transaction
If this above transaction does not return any rows, then look into v$session on target database to find the Transaction ID in columns MODULE and ACTION
The list transactions command is most useful to be able to diagnose Uncommitted transactions
Please also see Command affected 0 row(s) conflict