After transaction completed in undo tablespace what would happen? will they

after transaction completed in undo tablespace what would happen?
will they take out of undo tablespace or segment?
please elaborate, thank you

Hi,
Even, if the transaction is committed, there may remains a need to retain the undo data. For instance, for the long running queries or for the flashback features. In automatic undo management, you may specify the undo retention period, which is the minimum amount of time that Oracle Database attempts to retain old undo information before overwriting it.
One may also enable the retention guarantee, which ensures that the undo data will remain in the undo tablespace, even if that means that the transaction would fail due to lack of space in the undo tablespace.
In addition, also read the following:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/undo.htm
regards

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