If you have large tables and do a lot of full table scans I recommand you, for the same tablespace, to create two datafiles (one on each drive). The adavante of doing this is to spead the IO over several disks.
The extents of tables created on this tablespace will automaticly be distributed over the 2 files.
This will, of course, only be effective if your drives A and B are two phisycaly different disks.
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