設計一個例子，演示數據塊整理（合併）的效果

SQL> create table t as select object_id,object_name from dba_objects;

Table created.

 

SQL> insert into  t select object_id,object_name from dba_objects;

72552 rowscreated.

 

SQL> insert into  t select object_id,object_name from dba_objects;

72552 rowscreated.

 

SQL> insert into  t select object_id,object_name from dba_objects;

72552 rowscreated.

 

SQL> insert into  t select object_id,object_name from dba_objects;

72552 rowscreated.

 

SQL> insert into  t select object_id,object_name from dba_objects;

72552 rowscreated.

SQL> commit;

 

Commit complete.

SQL> ANALYZE TABLE T COMPUTE STATISTICS;

 

Table analyzed.

SQL> select blocks from user_tables where table_name='T';

 

   BLOCKS

----------

     2062

 

SQL> alter table t enable row movement;

 

Table altered.

 

SQL> alter table t shrink space;

 

 

Table altered.

 

 

SQL> ANALYZE TABLE T COMPUTE STATISTICS;

 

Table analyzed.

 

SQL> select blocks from user_tables where table_name='T';

 

BLOCKS

----------

1950