As the MVS paging rate increased for this environment, the application performance degraded. This can occur even while the system hit ratio increases.

DB2 V3 provides counters in the statistics records indication the number of time a requested pool page had to paged in for a read or write access. These should be monitored and tracked over time and compared to application performance. These paging counts are for the pools only, and does not include any paging activity for the rest of the address space. The counters should be added together for all the pools, and divided by the number of seconds in the statistics interval. The overall paging rate for the address space may be several to many times the rate per second of the pools alone, even though they are the major consumer of memory.