NOTE: Following exists before executing INSERT..SELECT
* Parallel DML is enabled.
* The table being inserted has Parallel degree pre-defined and/or the SELECT SQL has suppied with PARALLEL hints and/or the table being queried has Parallel degree pre-defined.
* Enough PQ Servers are available/running.
* Hardware supports Parallel DML.
* Instance has been started with enough various memory pockets.


Apart from above , it has to be multi cpu box if that iswhat u mean by Hardware.

Parallel load anyway does a direct load and is above HWM of table.

The append hint just pushes the insert above the HWM of table.

So u did not need to give both hints together.