It is possible to access a READ ONLY tablespace that is stored on a CD-ROM device. But I'm not sure it is really worth it. What happens if someone ejects the CD and the database tries to access that datafile? And the CD-ROM holds about 700 MB of data. With disk prices as low as they are, it doesn't cost much to purchase enough disk to hold 700 MB of data. While it is possible, I can't think of a single reason why I would want to perform this operation.
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