If a target table has no primary key or unique key, duplicate rows can exist. It is possible for Oracle GoldenGate to update or delete too many rows in the target table, causing the source and target data to go out of synchronization without error messages to alert you. To limit the number of rows that are updated, use the DBOPTIONS parameter with the LIMITROWS option in the Replicat parameter file. LIMITROWS can increase the performance of Oracle GoldenGate on the target system because only one row is processed.