Disk Unload의 약자
Recovery without any backup is normally not supported, however, Oracle Consulting can sometimes extract data from an off-line database using a utility called DUL (Disk UnLoad). This utility reads data in the data files and unloads it into SQL*Loader or export dump files. DUL does not care about rollback segments, corrupted blocks, etc, and can thus not guarantee that the data is not logically corrupt. It is intended as an absolute last resort and will most likely cost your company a lot of money!!!
출처 : http://blog.naver.com/orapybubu/40047939471
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