A Performance Distribution Server also builds a summary cube for each machine for which it is the primary source of performance data. This type of cube is designed to provide fast access to data that spans several days, weeks, or months. Each summary cube contains one year's worth of data for a single machine. However, the data is averaged to a granularity of 24 hours for each of the monitored resources, so a typical cube provides 365 samples per resource. All requests for performance data with a granularity of 24 hours or more are directed to the summary cube.
Note that summary data occupies approximately 10% of all storage space.
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