ORA-14402 updating partition key column

做DBA几年来，经常遇到项目到了维护期总是修改表的结构，原因很简单，就是随着数据量越来越大，对表的访问越来越慢。

故这次趁着割接，把这些表重新规划下。不过有个同事在进行划分分区表时，偏偏喜欢用状态字段做分区key，原因是每个月需要出报表，统计数据方便。

据我了解：
1）这个状态字段，根据业务变化，要经过从0到1，最终状态是3
2）而且从表的数据在这个状态字段上的分布了解到，最终状态3占到95%的数据

对partition key 进行update会报错，同时也会影响性能。这样的事情，费力不讨好，但是偏偏有人喜好。

I cannot reproduce, works as supposed for me...What version are you on ?

  1  create table t (x number, y char(10))
  2  partition by range (x) (
  3  partition p1 values less than (100),
  4  partition p2 values less than (maxvalue)
  5* )
test@CENTRAL> /

Table created.

test@CENTRAL> select table_name, row_movement from user_tables where table_name='T';

TABLE_NAME                     ROW_MOVE
------------------------------ --------
T                              DISABLED

test@CENTRAL>
test@CENTRAL> insert into t values (10,'a');

1 row created.

test@CENTRAL> commit;

Commit complete.

test@CENTRAL> update t set x = 110 ;
update t set x = 110
       *
ERROR at line 1:
ORA-14402: updating partition key column would cause a partition change


test@CENTRAL> alter table t enable row movement;

Table altered.

test@CENTRAL> update t set x = 110 ;

1 row updated.

test@CENTRAL> commit;

Commit complete.

test@CENTRAL> alter table t disable row movement;

Table altered.

test@CENTRAL> select table_name, row_movement from user_tables where table_name='T';

TABLE_NAME                     ROW_MOVE
------------------------------ --------
T                              DISABLED

test@CENTRAL> update t set x = 10; 
update t set x = 10
       *
ERROR at line 1:
ORA-14402: updating partition key column would cause a partition change


test@CENTRAL>


Stefan




On 5/2/06, hamid alavi <alavihamid@gmail.com> wrote:
List,

I have partition table and I did alter table table_name enable rowmovement, then when I try to Disable row movement still when I update the partition key the record updated means the disable does not work & I can not disable row movement afte enableing it, any idea?