If you copy sorted data into the table without explicitly specifying the IDENTITY starting point, bcp might not generate the IDENTITY column values in sorted order.
Parallel bulk copy reads the information into all the partitions simultaneously and updates the values of the IDENTITY column as it reads in the data.
A bcp statement with no explicit starting point would produce IDENTITY column numbers similar to those shown as follows:
The table has a maximum IDENTITY column number of 119, but the order is no longer meaningful.
To enforce unique IDENTITY column values in the SAP ASE server, run bcp with either the -g or -E parameter.