Can I gather object statistics on large tables at the same time?

We have large partitioned tables to the tune of 3-4 billion rows, and they have no object statistics. Can I gather object statistics for them at the same time? For example, 4-5 large tables at the same time. I need to gather them in multiple tables because we have several of those large tables and I have to schedule the gathering carefully. So, I want to start at 4 tables. I'm wondering if gathering statistics on the above tables will be intrusive or will impact the performance while it is running.
Alex

What version are you running? If you are running 11g they are automatically gathered via the autotask job DBMS_STATS.GATHER_DATABASE_STATS_JOB_PROC which, depending on your window, will normally run daily at 10 pm. Im very surpised that no stats have been gathered as this collects stats on all new tables or if more than 10% of rows have been changed.
See the following links:
http://www.oracle-base.com/articles/11g/automated-database-maintenance-task-management-11gr1.php
http://docs.oracle.com/cd/B28359_01/server.111/b28274/stats.htm

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