V$LOGMNR_EXTENTS definition in Oracle Database 11.2
V$LOGMNR_EXTENTS
select
OWNER, -- OWNER VARCHAR2(30)
SEGMENT_NAME, -- SEGMENT_NAME VARCHAR2(81)
PARTITION_NAME, -- PARTITION_NAME VARCHAR2(30)
SEGMENT_TYPE, -- SEGMENT_TYPE VARCHAR2(18)
TABLESPACE_NAME, -- TABLESPACE_NAME VARCHAR2(30)
EXTENT_ID, -- EXTENT_ID NUMBER
FILE_ID, -- FILE_ID NUMBER
BLOCK_ID, -- BLOCK_ID NUMBER
BYTES, -- BYTES NUMBER
BLOCKS, -- BLOCKS NUMBER
RELATIVE_FNO -- RELATIVE_FNO NUMBER
from
GV$LOGMNR_EXTENTS
where
inst_id = userenv('instance')