Oracle 11g rename. Guaranteed to be atomic?

Question

I have some (5) rename statements in a plsql script

drop table new;
rename old to new;

\"old\" tables hold very valuable information.

Answer 1

I'm guessing you're worried that concurrent DML (inserts/updates/deletes) on the old table might get missed during the rename? In which case, don't worry - RENAME is DDL and it locks the table for the duration.