DBA_LMT_USED_EXTENTS
All extents in the locally managed tablespacesColumns
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SEGMENT_FILEID
File number of segment header of the extent
SEGMENT_BLOCK
Block number of segment header of the extent
TABLESPACE_ID
ID of the tablespace containing the extent
EXTENT_ID
Extent number in the segment
FILEID
File Number of the extent
BLOCK
Starting block number of the extent
LENGTH
Number of blocks in the extent
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