Views by giving details of the undo segments?

Hi all

Please, are there view (s), questioned on this matter, elaborate us on the contents of the tablespace, undo (in particular on all lines that are stored in the undo segments)?

Thank you.

Hello

Dynamic performance views are useful to get space on the undo tablespace information
V$ UNDOSTAT
Contains statistics for monitoring and tuning undo space. Use this view to help estimate the amount of undo space required for the current workload. The database also uses this information to help address cancel its use in the system. This view is significant only in the management of automatic cancellation mode.

V$ ROLLSTAT
For automatic cancellation mode of administration, information reflect the behavior of the undo segments in the undo tablespace

V$ TRANSACTION
Contains the rollback segment information

DBA_UNDO_EXTENTS
Displays the status and the size of each measure in the undo tablespace.

WRH$ _UNDOSTAT
Includes instant statistics in V$ UNDOSTAT information. Please refer to the Oracle database DBA 2 day for more information.

WRH$ _ROLLSTAT
Includes instant statistics in V$ ROLLSTAT information. Please refer to the Oracle database DBA 2 day for more information.

See this link
http://download.Oracle.com/docs/CD/B14117_01/server.101/b10739/undo.htm

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