Indicates the number of index pages which have been requested from the buffer pool (logical) for regular and large table spaces.
Snapshot Level | Logical Data Grouping | Monitor Switch |
---|---|---|
Database | dbase | Buffer Pool |
Table Space | tablespace | Buffer Pool |
Buffer Pool | bufferpool | Buffer Pool |
Application | appl | Buffer Pool |
Application | stmt | Buffer Pool |
Dynamic SQL | dynsql | Buffer Pool, Statement |
Event Type | Logical Data Grouping | Monitor Switch |
---|---|---|
Activities | event_activity (reported in the details_xml document) | ACTIVITY METRICS BASE |
Activities | event_activitymetrics | ACTIVITY METRICS BASE |
Statistics | event_scstats (reported in the metrics document) | REQUEST METRICS BASE |
Statistics | event_wlstats (reported in the metrics document) | REQUEST METRICS BASE |
Unit of work | Reported in the system_metrics document. | REQUEST METRICS BASE |
Database | event_db | - |
Tablespaces | event_tablespace | - |
Connection | event_conn | - |
Statement | event_stmt | - |
Activities | event_activity | Buffer Pool, Statement |
Package cache | Reported in the activity_metrics document. | ACTIVITY METRICS BASE |
Statistics | event_scmetrics* | REQUEST METRICS BASE |
Statistics | event_wlmetrics* | REQUEST METRICS BASE |
* When returned as part of this logical data group, this element reflects the change in value of this metric since the last statistics collection or database activation, whichever was more recent. |
1 - ((pool_index_p_reads - pool_async_index_reads) / pool_index_l_reads)
1 - (pool_data_p_reads / pool_data_l_reads)
If the hit ratio is low, increasing the number of buffer pool pages may improve performance.