When a regular datafile is created, Oracle writes 0s to the blocks.
TEMPORARY files are created as 'sparse' files. Essentially, a header and
footer are created, space is allocated in the file control structures,
but nothing else is written. IIRC, this was introduced in Oracle8i, but
not really documented.
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Daniel W. Fink
http://www.optimaldba.com
IOUG-A Live! April 27 - May 1, 2003 Orlando, FL
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Author: Daniel W. Fink
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