DB2 Bulk update online database

Hi All,

I want to update an online table with 2 million records every hour. What is the best possible way to do it without impacting performance and avoiding any locking issues.

Can the above be done if we put 2 failover databases and update the records in one of the databases while taking the other offline? When one of the databases in this set up is taken offline whether the other one becomes primary automatically?

Thanks