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SQL> select sum(bytes) from user_segments
2 where segment_type='TABLE';
SUM(BYTES)
----------
65536
SQL> desc user_segments
À̸§ ³Î? À¯Çü
----------------------------------------- -------- ----------------------------
SEGMENT_NAME VARCHAR2(81)
PARTITION_NAME VARCHAR2(30)
SEGMENT_TYPE VARCHAR2(18)
TABLESPACE_NAME VARCHAR2(30)
BYTES NUMBER
BLOCKS NUMBER
EXTENTS NUMBER
INITIAL_EXTENT NUMBER
NEXT_EXTENT NUMBER
MIN_EXTENTS NUMBER
MAX_EXTENTS NUMBER
PCT_INCREASE NUMBER
FREELISTS NUMBER
FREELIST_GROUPS NUMBER
BUFFER_POOL VARCHAR2(7)
SQL>