在复制处理期间修改源模式中的表可能会导致在复制操作之后目标模式中的数据不相同。
Changes to tables in the source schema during copy processing might mean that the data in the target schema is not identical following a copy operation.
这个例子的意图是说明，在处理分区的表时，需要考虑到操作输出流涉及的分区数量。
The purpose of this example is to show that when dealing with partitioned tables, you need to account for the number of partitions from the operator output stream.
但是，如果一个xslt样式表对一个大型输入文档执行复杂操作或处理，那么应该考虑样式表所用结构对性能的影响。
But when an XSLT stylesheet performs complex operations or works on a large input document, it's time to start thinking about the performance impact of constructs used in the stylesheet.
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