Two "create table as select" locking?

Recently, a fellow DBA ran into a situation where two users issued a "create table as select * from A" at the exact same time. Neither job returned after an hour. She killed one of the jobs and the other finished immediately. Question: did the two "create table as select * from A" commands lock each other out? I know two "select * from A" should never lock each other, but does the "create table as" request a different type of lock?

Thanks,
Greg Received on Thu Aug 23 2001 - 07:43:05 CDT