Auto Undo Management in Oracle

Picture of Mertech Mertech : Feb 25, 2008 2:49:00 PM

Databases

Oracle 9 introduced a new way to manage rollback / undo data - an Undo Tablespace. To utilize Automatic Undo Management, create a tablespace in the database of type UNDO:


create undo tablespace UNDOTBS1 datafile '/U01/oradata/prod/undotbs_01.dbf'

extent management local uniform size 256k;


Next, modify your init file:

    • UNDO_MANAGEMENT=AUTO
    • UNDO_TABLESPACE=UNDOTBS1
    • UNDO_RETENTION=<# of minutes>

 
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