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in this session letamp;#39;s learn about undo retention period we know undo retention period is the number of seconds the committed undo data is retained and the parameter for that is undo underscore retention here in our example we are saying 1,800 that means the undo data is stored for at least 1,800 seconds okay this under attention parameter acts a little different in Auto extending undo tablespaces versus fixed size undo tablespaces in a auto extending undo tablespace the Oracle database retains the undo for at least the time specified in the undo retention period and it also periodically used this undo retention period to meet the undo requirements like we learned before Oracle constantly checks the Oracle database to see if there are any long-running Curieamp;#39;s and if the undo retention period does not support that long-running sequel statement it will increase the undo retention period okay in case of a fixed size undo tablespaces the Oracle database will automatically tu