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Sometimes at the first installation, we don’t care about the size of UNDO Tablespace. We just create it with maximum extensible unlimited size. So there’s one big data file with a big I/O since write-read process only on that file. This article I wrote for give you a solution how to replace an UNDO Tablespace with a big datafile with a new UNDO Tablespace with several tiny datafiles.

  1. Check the UNDO setting in the database :
  2. SQL> show parameter undo
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- --------------------
    undo_management                      string      AUTO
    undo_retention                       integer     10800
    undo_tablespace                      string      UNDOTBS1

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