【實驗】【PARTITION】RANGE分割槽表截斷表分割槽(Truncate Partition)

dawn009發表於2014-04-14
truncate表的效率有目共睹，那如何truncate分割槽表呢？
請看一下簡單的演示：

1.語法
alter table Partition_Table_Name truncate partition/subpartition Partition_Name update indexes;

2.建立分割槽表並插入資料
sec@ora10g> create table t_partition_range (id number,name varchar2(50))
  2  partition by range(id)(
  3  partition t_range_p1   values less than (10)       tablespace tbs_part01,
  4  partition t_range_p2   values less than (20)       tablespace tbs_part02,
  5  partition t_range_p3   values less than (30)       tablespace tbs_part03,
  6  partition t_range_pmax values less than (maxvalue) tablespace tbs_part04);

Table created.
                              
sec@ora10g> col TABLE_NAME for a20
sec@ora10g> col partition_name for a20
sec@ora10g> col HIGH_VALUE for a10
sec@ora10g> col TABLESPACE_NAME for a15
sec@ora10g> select table_name,partition_name,high_value,tablespace_name from user_tab_partitions where table_name='T_PARTITION_RANGE' order by partition_position;

TABLE_NAME           PARTITION_NAME       HIGH_VALUE TABLESPACE_NAME
-------------------- -------------------- ---------- ---------------
T_PARTITION_RANGE    T_RANGE_P1           10         TBS_PART01
T_PARTITION_RANGE    T_RANGE_P2           20         TBS_PART02
T_PARTITION_RANGE    T_RANGE_P3           30         TBS_PART03
T_PARTITION_RANGE    T_RANGE_PMAX         MAXVALUE   TBS_PART04

sec@ora10g> insert into T_PARTITION_RANGE values (2,'secooler02');

1 row created.

sec@ora10g> insert into T_PARTITION_RANGE values (3,'secooler03');

1 row created.

sec@ora10g> insert into T_PARTITION_RANGE values (4,'secooler04');

1 row created.

sec@ora10g> commit;

Commit complete.
                             
sec@ora10g> select *from t_partition_range partition(t_range_p1);

        ID NAME
---------- --------------------------------------------------
         2 secooler02
         3 secooler03
         4 secooler04

3.就是這樣的truncate分割槽
sec@ora10g> alter table t_partition_range truncate partition t_range_p1 update indexes;

Table truncated.

sec@ora10g> select * from t_partition_range partition(t_range_p1);

no rows selected

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來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/29119536/viewspace-1141877/，如需轉載，請註明出處，否則將追究法律責任。

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