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Oracle® Database Reference
11g Release 1 (11.1)

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

Column Datatype NULL Description
SEGMENT_FILEID NUMBER   File number of the segment header of the extent
SEGMENT_BLOCK NUMBER   Block number of the segment header of the extent
TABLESPACE_ID NUMBER   Identifier number of the tablespace containing the extent
EXTENT_ID NUMBER   Extent number in the segment
FILEID NUMBER   File identifier number of the file containing the extent
BLOCK NUMBER   Starting block number of the extent
LENGTH NUMBER   Number of blocks in the extent