180 SQL Performance Diagnosis on IBM DB2 Universal Database for iSeries
7.1 Collection Services and Database Monitor data
Collection Services allows you to gather performance data with little or no observable impact
on system performance. Its data is analyzed using the IBM Performance Tools for iSeries
licensed program (5722PT1) or other performance report applications, iSeries Navigator
monitors, and the graph history function. If you prefer to view real-time performance data,
system monitors provide an easy-to-use graphical interface for monitoring system
performance. For more information about iSeries Navigator Monitors, see “iSeries Navigator
monitors” in iSeries Performance Version 5 Release 3 on the Web at:
Collection Services collects data that identifies the relative amount of system resource used
by different areas of your system. While you are required to use Performance Tools for
iSeries, it is not required to gather the data.
In most of the analysis when looking for job-level information in this chapter, we use the
Component Report. The Component Report uses Collection Services data to provide
information about the same components of system performance as a System Report, but at a
greater level of detail. The Component Report helps you find the jobs that are consuming high
amounts of system resources, such as CPU, disk, and so on.
7.1.1 Starting Collection Services
To analyze Collection Services data, you must first start Collection Services, which you can
do in one of the following ways:
From the PERFORM menu, using GO PERFORM
From iSeries Navigator
Using Performance Management APIs
In V5R3, using the Start Performance Collection (STRPFRCOL) CL command
In the following sections, we explain the details for each of the methods to start Collection
Services to gather data.
Note: While running Collection Services, you should also run Database Monitor on all the
jobs. After we identify the job information of the job or jobs that consume high amounts of
system resources, such as CPU, disk and so on, we can the query the Database Monitor
data to find the jobs as explained in Chapter 6, “Querying the performance data of the
Database Monitor” on page 133.
Note: Starting Collection Services from the PERFORM menu or from iSeries Navigator
requires that you install Performance Tools for iSeries, 5722PT1.