SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS1
SQL> alter system set undo_retention=1800 scope=both
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 1800
undo_tablespace string UNDOTBS1
SQL> select sum(d.bytes) "undo" from v$datafile d , v$tablespace t , dba_tablespaces s where s.contents = 'UNDO' and s.status = 'ONLINE' and t.name = s.tablespace_name and d.ts# = t.ts#;
undo
----------
31457280
SQL> select max(undoblks/((end_time-begin_time)*3600*24)) "UNDO_BLOCK_PER_SEC" from v$undostat;
UNDO_BLOCK_PER_SEC
------------------
2.90217391
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