How to Shrink the datafile of Undo Tablespace

(Doc ID 268870.1)

Last updated on MARCH 08, 2018

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database - Standard Edition - Version and later
Information in this document applies to any platform.
***Checked for relevance on 23-May-2016***


Your production database has semiannual or annual purging programs which generate huge redo. Due to this requirement, your undo tablespace grows rapidly and occupies most of the space on file system. The purging process is run only few times a year. So would not like to keep the huge undo datafile in your database throughout the year. You don't want to buy additional disks unnecessarily.

You have created an undo tablespace with datafiles as AUTOEXTEND ON MAXSIZE UNLIMITED to avoid the error:

You want to shrink the datafile to utilize the disk space for other tablespaces or other purposes.


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