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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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DBA_DMT_USED_EXTENTS describes the extents comprising the segments in all dictionary managed tablespaces in the database.

Column Datatype NULL Description
SEGMENT_FILEID NUMBER NOT NULL File number of the segment header of the extent
SEGMENT_BLOCK NUMBER NOT NULL Block number of the segment header of the extent
TABLESPACE_ID NUMBER NOT NULL Identifier number of the tablespace containing the extent
EXTENT_ID NUMBER NOT NULL Extent number in the segment
FILEID NUMBER NOT NULL File identifier number of the file containing the extent
BLOCK NUMBER NOT NULL Starting block number of the extent
LENGTH NUMBER NOT NULL Number of blocks in the extent