1)
高水位表收集
SELECT NUM_ROWS,AVG_ROW_LEN*NUM_ROWS/1024/1024/0.9 NEED, BLOCKS*8/1024 TRUE,(BLOCKS*8/1024-AVG_ROW_LEN*NUM_ROWS/1024/1024/0.9) RECOVER_MB,TABLE_NAME
FROM dba_tables
WHERE tablespace_name='表空间名' AND BLOCKS*8/1024-AVG_ROW_LEN*NUM_ROWS/1024/1024/0.9>100
AND rownum<11 order by RECOVER_MB desc;
统计信息的脚本：exec dbms_stats.gather_table_stats('user','table_name');
2)
启用表的行转移功能
SQL> alter table '表名' enable row movement ;
3)
压缩高水位线
SQL> alter table '表名' shrink space ;
4)
查看统计信息
SQL> select t.table_name,BLOCKS,EMPTY_BLOCKS,NUM_ROWS
from user_tables t
where table_name = upper('表名');
5)
收集统计信息
SQL> exec dbms_stats.gather_table_stats('sys','表名');
6)
再次查看
SQL> select t.table_name,BLOCKS,EMPTY_BLOCKS,NUM_ROWS
from dba_tables t
where table_name = upper('表名');
