DB2 Version 9.7 for Linux, UNIX, and Windows

total_section_sort_time - Total section sort time monitor element

Total amount of time spent performing sorts while executing a section, which is the execution of the compiled query plan generated by the SQL statement that was issued by the client application. The value is given in milliseconds.

Table 1. Table Function Monitoring Information
Table Function	Monitor Element Collection Level
MON_GET_CONNECTION table function - Get connection metrics	REQUEST METRICS BASE
MON_GET_CONNECTION_DETAILS table function - Get detailed connection metrics (reported in DETAILS XML document)	REQUEST METRICS BASE
MON_GET_SERVICE_SUBCLASS table function - Get service subclass metrics	REQUEST METRICS BASE
MON_GET_SERVICE_SUBCLASS_DETAILS table function - Get detailed service subclass metrics (reported in DETAILS XML document)	REQUEST METRICS BASE
MON_GET_UNIT_OF_WORK table function - Get unit of work metrics	REQUEST METRICS BASE
MON_GET_UNIT_OF_WORK_DETAILS table function - Get detailed unit of work metrics (reported in DETAILS XML document)	REQUEST METRICS BASE
MON_GET_WORKLOAD table function - Get workload metrics	REQUEST METRICS BASE
MON_GET_WORKLOAD_DETAILS table function - Get detailed workload metrics (reported in DETAILS XML document)	REQUEST METRICS BASE
MON_GET_ACTIVITY_DETAILS table function - Get complete activity details (reported in DETAILS XML document)	ACTIVITY METRICS BASE
MON_GET_PKG_CACHE_STMT table function - Get SQL statement activity metrics in the package cache	ACTIVITY METRICS BASE
MON_GET_PKG_CACHE_STMT_DETAILS table function - get detailed metrics for package cache entries	ACTIVITY METRICS BASE

Table 2. Event Monitoring Information
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
Package cache	Reported in the activity_metrics document.	ACTIVITY METRICS BASE
Unit of work	Reported in the system_metrics document.	REQUEST 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.

Usage

At the system level, use this element with the total_section_sorts monitor element to calculate the average sort time during section execution, which can indicate whether or not sorting is an issue as far as statement performance is concerned.

The total_section_sort_time element includes both wait and processing time. If the value of (total_section_sort_time - total_section_sort_proc_time) is high, sorts are spending a lot of time waiting. For example, if sorts are frequently spilling to disk, the value of the total_section_sort_time monitor element will increase due to I/O waits. This time will not be included in the total_section_sort_proc_time monitor element value, which only counts the time actively processing a sort. In this case, you may consider tuning sort memory to improve performance.

At the activity level, use this element to identify statements that spend a large amount of time sorting. These statements may benefit from additional tuning to reduce the sort time.