The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
To improve archiving performance in Data Archive, you can use parallel processing in SQL statements. Data Archive parallelism utilizes the Parallel Query and Parallel DML Oracle database features. It invokes them by adding hints to the SQL statements it executes. You can also process multiple tables simultaneously using java parallelism/threading.