Questions on Un do Management.

Howdy all. I havae a couple questions on this utility that I am hoping someone could assist with.
1; The location of the Undo Management Screen can be found here: http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14196/storage003.htm#CHDBAEDB
but I simply don't have it in my 10g Enterprise Manager. I can see the Undo Tablespace, but not the Manager. Any ideas why?
2; I understand there there are 3 types of Undo information (Uncommitted, Committed, and Expired), but I don't see the value of the last 2. For example, if a transaction is Committed, but still remains in the Undo file do to the retention period, what good is it? I don't know if there is any way this info can be used for anything once the transaction is committed, is there?
TIA, ChrisR

The retention is a suggestion, not an absolute rule. But yes, if the retention is specified as less than the longest running query in the system, you potentially run the risk of the dreaded ORA-01555 "snapshot too old". This error occurs when the read consistent view cannot be created. You won't see inconsistent data, Oracle doesn't allow that.
Check out this discussion at AskTom for some details on how retention can cause snapshot too old errors.
Message was edited by:
rbglossip

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user631017
Message was edited by:
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