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answers:

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What's the "standard" (defacto or otherwise) way to dump an Oracle database/instance to an ascii or binary file, and then reimport that file into a separate Oracle instance.

I'm looking for the equivalent of mysqldump, but for the Oracle platform.

+3  A: 

I believe you're looking for the Oracle Import / Export utility:

http://www.orafaq.com/wiki/Import_Export_FAQ

sangretu
note that this is a binary solution, not ascii.
akf
+5  A: 

Actually, I'm pretty sure imp + exp have been superceeded by Oracle Data Pump.

imp + exp do not support all Oracle 10g + 11g features

See http://www.orafaq.com/wiki/Datapump

cagcowboy