Oracle 分区表如何添加分区

1.创建个分区表

SQL> create table p_range_test

2 (id number,name varchar2(100))

3 partition by range(id)(

4 partition t_p1 values less than (10),

5 partition t_p2 values less than (20),

6 partition t_p3 values less than (30)

7 );

Table created.

2.查第一步创建好分区表的信息

SQL> col TABLE_NAME for a20

SQL> col partition_name for a20

SQL> col HIGH_VALUE for a10

SQL> col TABLESPACE_NAME for a15

SQL> select table_name,partition_name,high_value,tablespace_name

from user_tab_partitions where table_name='P_RANGE_TEST'

order by partition_position;

TABLE_NAME PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

-------------------- -------------------- ---------- ---------------

P_RANGE_TEST T_P1 10 TP1

P_RANGE_TEST T_P2 20 TP1

P_RANGE_TEST T_P3 30 TP1

从上面看出已有3个分区

3.添加一个分区t_p4

SQL> alter table p_range_test add partition t_p4 values less than(40);

Table altered.

顺序添加完成，当然这个不是LZ想要的吧？

4.再第三步添加好分区的信息

SQL> select table_name,partition_name,high_value,tablespace_name

from user_tab_partitions where table_name='P_RANGE_TEST'

order by partition_position;

TABLE_NAME PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

-------------------- -------------------- ---------- ---------------

P_RANGE_TEST T_P1 10 TP1

P_RANGE_TEST T_P2 20 TP1

P_RANGE_TEST T_P3 30 TP1

P_RANGE_TEST T_P4 40 TP1

从这个实验结果可以看到t_p4分区已经创建成功

5.如果在创建RANGE分区表的时候指定了maxvalue,不可以添加分区

(需要使用split方法来处理)

6.创建带有maxvalue的分区表

SQL> drop table p_range_test purge;--purge不回收

create table p_range_test (id number,name varchar2(100))

partition by range(id)(

partition t_p1 values less than (10),

partition t_p2 values less than (20),

partition t_p3 values less than (30),

partition t_pmax values less than (maxvalue));

Table dropped.

SQL> 2 3 4 5 6

Table created.

7.此时添加分区时会报如下的错误

SQL> alter table p_range_test add partition t_p4 values less than(40);

alter table p_range_test add partition t_p4 values less than(40)

*

ERROR at line 1:

ORA-14074: partition bound must collate higher than that of the last partition

添加分区失败？那有没有办法搞定呢,对于牛B的oracle来说肯定有办法了,

处理方法就是使用split来搞！

8.再查一下当前的分表的信息

SQL> select table_name,partition_name,high_value,tablespace_name

from user_tab_partitions where table_name='P_RANGE_TEST'

order by partition_position;

TABLE_NAME PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

-------------------- -------------------- ---------- ---------------

P_RANGE_TEST T_P1 10 TP1

P_RANGE_TEST T_P2 20 TP1

P_RANGE_TEST T_P3 30 TP1

P_RANGE_TEST T_PMAX MAXVALUE TP1

9.注意，这步就是关键的一步！！！使用split完成上面没有完成的分区任务

SQL> alter table p_range_test split partition t_pmax at (40) into

(partition T_P4, partition t_pmax);

Table altered.

10.再查一下当前的分表的信息

SQL> select table_name,partition_name,high_value,tablespace_name

from user_tab_partitions where table_name='P_RANGE_TEST'

order by partition_position;

TABLE_NAME PARTITION_NAME HIGH_VALUE TABLESPACE_NAME

-------------------- -------------------- ---------- ---------------

P_RANGE_TEST T_P1 10 TP1

P_RANGE_TEST T_P2 20 TP1

P_RANGE_TEST T_P3 30 TP1

P_RANGE_TEST T_P4 40 TP1

P_RANGE_TEST T_PMAX MAXVALUE TP1

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