To improve performance of this query, an index for the piid attribute has been added as shown in Listing 14.

要改进这个查询的性能，请为piid属性添加索引，参见清单14。

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Two events belong to the same activity instance if they have the same activity template ID (ATID) and the same process instance ID (PIID).

如果两个事件具有相同的活动模板 ID （ATID）和相同的流程实例 ID（PIID），那么这两个事件就属于同一个活动实例。

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