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Oracle9i Database Reference
Release 2 (9.2)

Part Number A96536-02
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DBA_UNDO_EXTENTS

DBA_UNDO_EXTENTS describes the extents comprising the segments in all undo tablespaces in the database.

Column Datatype NULL Description

OWNER

CHAR(3)

Owner of the undo tablespace

SEGMENT_NAME

VARCHAR2(30)

NOT NULL

Name of the undo segment

TABLESPACE_NAME

VARCHAR2(30)

NOT NULL

Name of the undo tablespace

EXTENT_ID

NUMBER

ID of the extent

FILE_ID

NUMBER

NOT NULL

File identifier number of the file containing the extent

BLOCK_ID

NUMBER

Start block number of the extent

BYTES

NUMBER

Size of the extent (in bytes)

BLOCKS

NUMBER

Size of the extent (in blocks)

RELATIVE_FNO

NUMBER

Relative number of the file containing the segment header

COMMIT_JTIME

NUMBER

Commit time of the undo in the extent expressed as Julian time

COMMIT_WTIME

VARCHAR2(20)

Commit time of the undo in the extent expressed as Wallclock time

STATUS

VARCHAR2(9)

Transaction Status of the undo in the extent:

  • ACTIVE
  • EXPIRED
  • UNEXPIRED