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Oracle® Database Reference
10g Release 2 (10.2)

Part Number B14237-01
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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