How to find the undo tablespace expired/unexpired in oracle11g

let us we discuss how to find the undo tablespace expired /unexpired in oracle11g


SQL> SELECT tablespace_name, status, COUNT(*) AS HOW_MANY
  2  FROM dba_undo_extents
  3  GROUP BY tablespace_name, status;

TABLESPACE_NAME                STATUS      HOW_MANY
------------------------------             -------------       --------------------
UNDOTBS1                            UNEXPIRED         13
UNDOTBS1                            EXPIRED              48


Source: Google,ozwenolivercoelho

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