The Getpages from Insight do not match the Getpages from Detector, for the same SQL statement . Why not?

Document ID : KB000017164
Last Modified Date : 14/02/2018
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Introduction:

This document explains why the Getpages in Insight may not match the Getpages from Detector, for the same SQL statement. 

Question:

The Getpages from Insight do not match the Getpages from Detector, for the same SQL statement. Why not?

Environment:
z/OS 1.11 and above.
Answer:

The Insight Detail & History screens, as well as the BTACTSMS report uses the GET-PAGE field. Whereas, the PKG-GET-PAGE field is a better match for Detector.

Also, what apparently is not counted (or rather aggregated into IFCIDs) are the package level details of getpages (or more generally per buffer pool stats) in child threads roll up records (when parallelism is involved), but thread level data are still available. That’s the source of the discrepancy between summaries of GET-PAGE and PKG-GET-PAGE fields.