The partitioning map is created when a database partition group is created.

当创建数据库分区组时，同时会创建分区映射。

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The partition number is used as an index into the partitioning map.

分区号用作分区映射的索引。

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When a database partition group is created or modified, a partitioning map is associated with it.

当创建或修改一个数据库分区组时，就会有一个与之关联的分区映射。

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