Flashback queries

It's been awhile since I've looked at flashback queries, and I have a couple questions:

• Given an SCN, is there any way to know for certain whether a flashback query to that SCN is possible? Can a non-DBA user determine this?
• Is there an easy way to determine how much undo data my database is (hopefully) retaining? In other words, can I easily determine how far back in the past I *can* go?

Yes, here it is Christmas eve, and I'm working away...

Best regards,

Jonathan Gennick --- Brighten the corner where you are http://Gennick.com * 906.387.1698 * mailto:jonathan@gennick.com

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