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SQL> desc user_extents;
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----------------------------------------- -------- ----------------------------
SEGMENT_NAME VARCHAR2(81)
PARTITION_NAME VARCHAR2(30)
SEGMENT_TYPE VARCHAR2(18)
TABLESPACE_NAME VARCHAR2(30)
EXTENT_ID NUMBER
BYTES NUMBER
BLOCKS NUMBER
SQL> select segment_name,extent_id,tablespace_name from user_extents;
SEGMENT_NAME EXTENT_ID TABLESPACE_NAME
-------------------- ---------- ---------------
DEPT 0 USERS
EMP 0 USERS
BONUS 0 USERS
SALGRADE 0 USERS
PK_DEPT 0 USERS
PK_EMP 0 USERS
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