Buffer pool statistics - fields (ISPF)

This topic describes the statistics that are displayed on the Buffer Pool Statistics panel.

Buffer Pool Hit Ratio (%)
The hit ratio for buffer pools.
Calculation
Hit Ratio = (Get Page Requests - Synchronous Pages Read - Async Pages Read) / Get Page Requests * 100%
Note: This formula differs from the formula that OMEGAMON Batch Reporter uses to calculate Buffer Pool Hit Ratio, so a different calculation result is expected.
Offload table name
not applicable
Column name
not applicable
Get Page Requests
The number of getpage requests. This includes conditional, unconditional, successful, and unsuccessful requests. The GETPAGE information for a program reported on the activity summary might not add up to the sum of object detail GETPAGEs of that program due to the trade-off between optimizing the collector for efficiency and increasing the level of detail in some statistics.
Offload table name
CQM_SUMM_METRICS
Column name
GETPAGES
Buffer Pages Updated
The number of buffer pages updated.
Synchronous Pages Read
The number of synchronous read I/O for the object.
Offload table name
CQM_SUMM_METRICS
Column name
SYNC_READS
Synchronous Pages Written
The number of synchronous write I/O for the object.
Offload table name
CQM_SUMM_METRICS
Column name
SYNC_WRITES
Sequential Prefetch Requests
The number of SEQ PREFETCH requested for the object.
Offload table name
CQM_SUMM_METRICS
Column name
SEQ_PREFETCH
List Prefetch Requests
The number of LIST PREFETCH requests for the object.
Offload table name
CQM_SUMM_METRICS
Column name
LIST_PREFETCH
Dynamic Prefetch Requests
The number of DYNAMIC PREFETCH requested for the object.
Offload table name
CQM_SUMM_METRICS
Column name
DYNAMIC_PREFETCH
Asynch Pages Read
The number of asynchronous pages read by prefetch.
Offload table name
CQM_SUMM_METRICS
Column name
ASYNCH_PAGES_READ
zHyperlink Cache Hits
The number of read with disk cache hits.
Offload table name
CQM_SUMM_METRICS
Column name
HYPERL_CACHE_HITS
zHyperlink READ I/O
The number of SyncIO read with zHyperlink.
Offload table name
CQM_SUMM_METRICS
Column name
HYPERL_SYNCH_READS
zHyperlink Read Elapse Time
The elapsed time for successful zHyperlink reads.
Offload table name
not applicable
Column name
HYPERL_READ_ELAPSE