Hi Rahul,
Couple of points:
1) Can you please merge the delta for the COBK table before the insert
2) Can you please try with CREATE TABLE ... like .. WITH DATA option.
You have 358.5 million records. Insert into .. as select .. may not be a good choice here. Please try with CREATE TABLE .. WITH DATA option. But have the delta merge done before.
Alternatively, you can split the data volume into manageable chunks and try the insert.
Regards,
Ravi