oracle_分区管理，新增分区，删除分区，
1.删除数据，保留分区，用truncate
alter table 表名 truncate partition 分区名
2.同时删除分区和数据，用drop
alter table 表名 drop partition 分区名;
3.分区时加上update global indexes
alter table PUB_WORKFLOWNOTE split partition part_max at (to_date(‘2013-02-01’,‘yyyy-mm-dd’)) into
(partition part_201301,partition part_max) update global indexes;
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
https://blog.csdn.net/iteye_5649/article/details/82635633?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-6###