While monitoring DB2 Bufferpools using the CA Sysview online and batch BTSTASM2 reports, the BP1 Buffer pool hit ratio is very low at 46.2 %
How is the Buffer pool hit ratio calculated? From a high level it would the (total req - the total reads) / total req * 100.
Release : 20.0
Component : CA Insight Database Performance Monitor for DB for z/OS
Buffer pool hit ratio in BTSTASM2 is the average not a total. You can see that definition in the BTSTASM2 in the following line:
% :041 'HIT RATIO ' AVG(BP-HITRATIO) (PF=N3.1)