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Oracle® Database Administrator's Guide
11g Release 2 (11.2)

Part Number E17120-05
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Setting the Minimum Undo Retention Period

You specify the minimum undo retention period (in seconds) by setting the UNDO_RETENTION initialization parameter. As described in "About the Undo Retention Period", the current undo retention period may be automatically tuned to be greater than UNDO_RETENTION, or, unless retention guarantee is enabled, less than UNDO_RETENTION if space in the undo tablespace is low.

To set the minimum undo retention period:

The effect of an UNDO_RETENTION parameter change is immediate, but it can only be honored if the current undo tablespace has enough space.