分区表的维护 - ORA-14402 更新分区关键字列

在使用分区表时，需要注意的一个问题是，当我们更新分区字段时，可能会遇到如下错误：

SQL> update DOM_REAL_CATEGORY_FL set doc_level=101 where doc_level=51;
update DOM_REAL_CATEGORY_FL set doc_level=101 where doc_level=51
*
ERROR at line 1:
ORA-14402: updating partition key column would cause a partition change

这个错误的解释是：

ORA-14402: updating partition key column would cause a partition change
Cause: An UPDATE statement attempted to change the value of a partition key column causing migration of the row to another partition
Action: Do not attempt to update a partition key column or make sure that the new partition key is within the range containing the old partition key.

为了解决这个问题，可以使用如下命令更改分区表的属性：

SQL> alter table DOM_REAL_CATEGORY_FL enable row movement;

Table altered.

更改分区表的分区键值，意味着要删除记录并重新插入一条新的记录，这会引起记录（Record）的移动，记录的Rowid会改变，相关索引需要进行维护。

SQL> update DOM_REAL_CATEGORY_FL set doc_level=101 where doc_level=51;

57024 rows updated.

Elapsed: 00:00:34.61