分布键必须由关系列组成，它不能引用xml列。
The distribution key must consist of relational columns, and it cannot reference an XML column.
与以前的DB 2版本一样，一定要通过选择分布键跨分区均匀地分布行。
As with earlier releases of DB2, it is important to select a distribution key that evenly distributes rows across partitions.
在使用DPF时，根据表的分布键(这在创建表时定义)的散列值，把表的每一行放在特定的数据库分区中。
With DPF, each row of a given table is placed in a specific database partition based on the hashed value of the table's distribution key, which is defined when the table is created.
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