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The table is logically joined to itself, and the more selective non-leading index keys are applied as index bound filters to each unique combination of the leading key values.
首先在逻辑上将表与其自身连接，然后将更具有选择性的非起始索引键作为索引绑定过滤器，应用于起始键值的每个惟一的组合。
However, since XML columns cannot be part of the table partitioning key, any unique XML values index will have to be created as a global index.
然而，由于xml列不属于表分区键的一部分，任何唯一xml值索引必须创建为全局索引。
You can help speed up index maintenance by using a large buffer pool for the index tablespace, and, if possible, ordering the inserts so that the key values are ordered, not random.
如果为索引表空间使用较大的缓冲池，并且尽可能地将不同 insert 排序，以便键值是排好序的，而不是随机的，就可以帮助加快索引维护。
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