POID提供了一个生命期较长的对象，它的全局标识的作用域可以跨越空间和时间。
POIDs provide a long lived object with a global identity that transcends space and time.
如果使用全局视图，就要明白performanceExpert可能要花费一定的时间才能返回数据。
If you do choose to get a global view, understand it might take a while for Performance Expert to return data.
一旦被建立，全局备份会和当前数据持续同样长的时间。
Once created, global backups persist as long as original memory block.
一旦被建立，全局备份会和当前数据持续同样长的时间。
Once created, global backups persist as long as original memory block.
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