Oracle教程之管理表（五）--Oracle表空间回收

1、原始表结构信息06:49:50 SQL> analyze table emp1 compute statistics;Table analyzed.06:50:00 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:50:18 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 91 5 143362、delete删除部分记录06:50:48 SQL> DELETE from emp1 where deptno=30;6144 rows deleted.06:50:53 SQL> select count(*) from emp1;COUNT(*)----------819206:51:03 SQL> analyze table emp1 compute statistics;Table analyzed.06:51:08 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:51:11 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 91 5 81923、利用move 释放空间06:51:49 SQL> alter table emp1 move;Table altered.06:51:53 SQL> analyze table emp1 compute statistics;Table analyzed.06:51:57 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:52:01 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 53 3 81924、利用 shrink space 释放空间06:52:03 SQL> DELETE from emp1 where deptno=10;4096 rows deleted.06:52:28 SQL> select count(*) from emp1;COUNT(*)----------409606:52:33 SQL> analyze table emp1 compute statistics;Table analyzed.06:52:36 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:52:39 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 53 3 409606:53:36 SQL> alter table emp1 shrink space;alter table emp1 shrink space*ERROR at line 1:ORA-10636: ROW MOVEMENT is not enabled06:53:56 SQL> alter table emp1 enable row movement;Table altered.06:54:15 SQL> alter table emp1 shrink space;Table altered.06:54:42 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:54:46 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 53 3 409606:54:48 SQL> analyze table emp1 compute statistics06:54:57 2 ;Table analyzed.06:54:58 SQL> select table_name,blocks,empty_blocks,num_rows from user_tables06:55:01 2 where table_name='EMP1';TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS---------- ---------- ------------ ----------EMP1 22 10 4096
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