查出碎片最多的表
先搞一个简单的
select t.table_name,
avg_row_len * num_rows / (1 - pct_free / 100) / 8192 actual_block,
alloc_block,
1 - ((avg_row_len * num_rows / (1 - pct_free / 100) / 8192) / alloc_block) percen,
'alter table '||t.table_name||'enable row movement'||';' enable_row,
'alter table '||t.table_name||'shrink space'||';' ddl_shrink
from (select segment_name, sum(blocks) alloc_block
from user_extents
having sum(blocks) > 8
group by segment_name) a,
user_tables t
where a.segment_name = t.table_name
and num_rows is not null
and num_rows > 0
order by 4 desc;
在上一个详细的
SELECT OWNER, SEGMENT_NAME TABLE_NAME, SEGMENT_TYPE TYPE,
GREATEST(ROUND(100 * (NVL(HWM - AVG_USED_BLOCKS,0)/GREATEST(NVL(HWM,1),1) ), 2), 0) "WASTE_PER(%)",
ROUND(BYTES/1024/1024, 2) "Total(M)", 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 BLOCKS > 128
AND OWNER in (user_name1,user_name2)
ORDER BY 1 ASC, 4 DESC;