Oracle Database Discussions

I am running an insert statement, my insert statement selects 8 million rows from table B and inserts into table A

insert into tableA (...)
select ... from tableB

I have altered both the tables to have NOLOGGING option.

Do you think this is the right way to do or I should turn NOLOGGING on tableA and LOGGING on tableB

Since it involves the insert and select of 8 millions I am converned about the performance and time it takes for the Insert to complete

Any suggestions and inputs would help

Thanks