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Thread: Can i reduce the size of UNDO tablespace datafile..??

  1. #1
    Join Date
    Oct 2012

    Can i reduce the size of UNDO tablespace datafile..??

    the actual size

    SQL> select tablespace_name,sum(bytes) from dba_data_files group by tablespace_name;

    ------------------------------ ----------
    UNDO 3

    space occupied
    SQL> select tablespace_name,sum(bytes) from dba_segments group by tablespace_name;

    ------------------------------ ----------
    UNDO 198

    now when i am resizing the datafile to 1GB i am getting this error..

    SQL> ALTER DATABASE DATAFILE '/oradata/u01/undo01.dbf' RESIZE 1024M;
    ALTER DATABASE DATAFILE '/oradata/u01/undo01.dbf' RESIZE 1024M
    ERROR at line 1:
    ORA-03297: file contains used data beyond requested RESIZE value

    can someone help me with this.

  2. #2
    Join Date
    Mar 2007
    Ft. Lauderdale, FL
    Create a new UNDO tablespace, drop the old one.

    For details check Metalink Note 431652.1
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  3. #3
    Join Date
    Oct 2012
    thank you ..!! PAVB

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