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I wonder how it's possible to lose in database about 80% of foreign keys?

We had development and test databases in parallel.

Now I have found that diff of the schemas shows that FK's are not there. So is it possible to track down what happened with them? I've tried to get change history, but ARCHIVLOG was disabled.

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I don't think you can get that information because Oracle doesn't keep such a history. –  a_horse_with_no_name Jun 10 '13 at 14:57
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