【實驗】【PARTITION】RANGE分割槽表合併分割槽

secooler發表於2009-07-15
1.建立測試用range分割槽表
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.

2.查詢分割槽情況
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

3.每個分割槽各插入一條資料
sec@ora10g> insert into T_PARTITION_RANGE values (9,'secooler01');

1 row created.

sec@ora10g> insert into T_PARTITION_RANGE values (19,'secooler02');

1 row created.

sec@ora10g> insert into T_PARTITION_RANGE values (29,'secooler03');

1 row created.

sec@ora10g> insert into T_PARTITION_RANGE values (39,'secooler04');

1 row created.

sec@ora10g> commit;

Commit complete.

4.確認每個分割槽包含的資料
sec@ora10g> select * from T_PARTITION_RANGE partition(T_RANGE_P1);

        ID NAME
---------- --------------------------------------------------
         9 secooler01

sec@ora10g> select * from T_PARTITION_RANGE partition(T_RANGE_P2);

        ID NAME
---------- --------------------------------------------------
        19 secooler02

sec@ora10g> select * from T_PARTITION_RANGE partition(T_RANGE_P3);

        ID NAME
---------- --------------------------------------------------
        29 secooler03

sec@ora10g> select * from T_PARTITION_RANGE partition(T_RANGE_PMAX);

        ID NAME
---------- --------------------------------------------------
        39 secooler04

5.開始合併分割槽--將前兩個分割槽t_range_p1,t_range_p2合併到新分割槽t_range_pmerge中
sec@ora10g> alter table t_partition_range merge partitions t_range_p1,t_range_p2 into partition t_range_pmerge tablespace tbs_part04;

Table altered.

6.再一次確認分割槽情況和每一個分割槽記憶體放的資料
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_PMERGE       20         TBS_PART04
T_PARTITION_RANGE    T_RANGE_P3           30         TBS_PART03
T_PARTITION_RANGE    T_RANGE_PMAX         MAXVALUE   TBS_PART04

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

        ID NAME
---------- --------------------------------------------------
         9 secooler01
        19 secooler02

sec@ora10g> select * from t_partition_range partition(T_RANGE_P3);

        ID NAME
---------- --------------------------------------------------
        29 secooler03

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

        ID NAME
---------- --------------------------------------------------
        39 secooler04

7.OK，合併分割槽成功

8.向低一級別的分割槽合併是不被允許的（較大的值不能插入到較小值分割槽中）
sec@ora10g> alter table t_partition_range merge partitions t_range_p1,t_range_p2 into partition t_range_p1;
alter table t_partition_range merge partitions t_range_p1,t_range_p2 into partition t_range_p1 tablespace tbs_part04
                                               *
ERROR at line 1:
ORA-14275: cannot reuse lower-bound partition as resulting partition

9.向高一級別的分割槽合併沒有問題
sec@ora10g> alter table t_partition_range merge partitions t_range_p1,t_range_p2 into partition t_range_p2；

Table altered.


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