如果一个源系统是非分区的，那么WebSphereDataStage首先会连续地读数据，然后将数据分区，以便利用并行。
If a source system is not partitioned, WebSphere DataStage initially reads the data sequentially, and then partitions it in order to take advantage of parallelism.
从InformixSYSCHUNKS系统表中读数据，并根据以下标准包括镜像块。
Read data from the Informix SYSCHUNKS system table and include mirror chunks according to this criteria.
从InformixSYSCHUNKS系统表中读数据，并根据以下标准包括镜像块。
Read data from the Informix SYSCHUNKS system table and include mirror chunks according to this criteria.
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