li.angshan µÄ²©¿Í

This will update the table statistics. After generating the 
statistics, to determine the high water mark: 
SELECT blocks, empty_blocks, num_rows 
FROM user_tables 
WHERE table_name = <tablename>;

SELECT OWNER, SEGMENT_NAME TABLE_NAME, SEGMENT_TYPE, 
GREATEST(ROUND(100 * (NVL(HWM - AVG_USED_BLOCKS,0)/GREATEST(NVL(HWM,1),1) ), 2), 0) WASTE_PER,
ROUND(BYTES/1024, 2) TABLE_KB, NUM_ROWS, 
BLOCKS, EMPTY_BLOCKS, HWM HIGHWATER_MARK, AVG_USED_BLOCKS,
CHAIN_PER, EXTENTS, MAX_EXTENTS, ALLO_EXTENT_PER,
DECODE(GREATEST(MAX_FREE_SPACE - NEXT_EXTENT, 0), 0,'N','Y') CAN_EXTEND_SPACE, 
NEXT_EXTENT, MAX_FREE_SPACE,
O_TABLESPACE_NAME TABLESPACE_NAME
FROM 
(SELECT A.OWNER OWNER, A.SEGMENT_NAME, A.SEGMENT_TYPE, A.BYTES,
B.NUM_ROWS, A.BLOCKS BLOCKS, B.EMPTY_BLOCKS EMPTY_BLOCKS, 
A.BLOCKS - B.EMPTY_BLOCKS - 1 HWM,
DECODE( ROUND((B.AVG_ROW_LEN * NUM_ROWS * (1 + (PCT_FREE/100)))/C.BLOCKSIZE, 0),
0, 1,
ROUND((B.AVG_ROW_LEN * NUM_ROWS * (1 + (PCT_FREE/100)))/C.BLOCKSIZE, 0)
) + 2 AVG_USED_BLOCKS,
ROUND(100 * (NVL(B.CHAIN_CNT, 0)/GREATEST(NVL(B.NUM_ROWS, 1), 1)), 2) CHAIN_PER,
ROUND(100 * (A.EXTENTS/A.MAX_EXTENTS), 2) ALLO_EXTENT_PER,A.EXTENTS EXTENTS,
A.MAX_EXTENTS MAX_EXTENTS, B.NEXT_EXTENT NEXT_EXTENT, B.TABLESPACE_NAME O_TABLESPACE_NAME
FROM SYS.DBA_SEGMENTS A,
SYS.DBA_TABLES B,
SYS.TS$ C
WHERE A.OWNER =B.OWNER and 
SEGMENT_NAME = TABLE_NAME and
SEGMENT_TYPE = 'TABLE' AND
B.TABLESPACE_NAME = C.NAME
UNION ALL
SELECT A.OWNER OWNER, SEGMENT_NAME || '.' || B.PARTITION_NAME, SEGMENT_TYPE, BYTES,
B.NUM_ROWS, A.BLOCKS BLOCKS, B.EMPTY_BLOCKS EMPTY_BLOCKS, 
A.BLOCKS - B.EMPTY_BLOCKS - 1 HWM,
DECODE( ROUND((B.AVG_ROW_LEN * B.NUM_ROWS * (1 + (B.PCT_FREE/100)))/C.BLOCKSIZE, 0),
0, 1,
ROUND((B.AVG_ROW_LEN * B.NUM_ROWS * (1 + (B.PCT_FREE/100)))/C.BLOCKSIZE, 0)
) + 2 AVG_USED_BLOCKS,
ROUND(100 * (NVL(B.CHAIN_CNT,0)/GREATEST(NVL(B.NUM_ROWS, 1), 1)), 2) CHAIN_PER,
ROUND(100 * (A.EXTENTS/A.MAX_EXTENTS), 2) ALLO_EXTENT_PER, A.EXTENTS EXTENTS, 
A.MAX_EXTENTS MAX_EXTENTS, B.NEXT_EXTENT,
B.TABLESPACE_NAME O_TABLESPACE_NAME
FROM SYS.DBA_SEGMENTS A,
SYS.DBA_TAB_PARTITIONS B,
SYS.TS$ C,
SYS.DBA_TABLES D
WHERE A.OWNER = B.TABLE_OWNER and 
SEGMENT_NAME = B.TABLE_NAME and
SEGMENT_TYPE = 'TABLE PARTITION' AND
B.TABLESPACE_NAME = C.NAME AND
D.OWNER = B.TABLE_OWNER AND
D.TABLE_NAME = B.TABLE_NAME AND
A.PARTITION_NAME = B.PARTITION_NAME),
(SELECT TABLESPACE_NAME F_TABLESPACE_NAME,MAX(BYTES)
MAX_FREE_SPACE
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME)
WHERE F_TABLESPACE_NAME = O_TABLESPACE_NAME AND
GREATEST(ROUND(100 * (NVL(HWM - AVG_USED_BLOCKS, 0)/GREATEST(NVL(HWM, 1), 1) ), 2), 0) > 25
AND OWNER = '??' AND BLOCKS > 128
ORDER BY 10 DESC, 1 ASC, 2 ASC;