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► DB2 Network Stats ABAP report (see Figure 5-16)<br />
This report shows network statistic information for a defined time frame, but requires the<br />
collection to be enabled. Some of the data can also be aggregated to obtain an overview.<br />
Among other information, the number of round trips, round-trip time and server time, and<br />
data transfer is shown for an interval.<br />
Figure 5-16 Network statistics (aggregate)<br />
For example, in the ITSO lab environment (see Figure 4-13 on page 76), application server<br />
p5503p2 has a performance problem. The system response is slow. Because the hardware<br />
setup is identical between both AIX systems in the lab environment, it might be a network<br />
issue.<br />
We use the DB2 Network Stats report (Figure 5-16) to analyze the network performance and<br />
compare the ratio of all application servers, by using the equation:<br />
(roundtrip time – server time)/roundtrips<br />
This equation gives of the ratios for the following servers:<br />
► lnxsu11: 167.71 (microsecond / roundtrip)<br />
► aixsu11: 298.28 (microsecond / roundtrip)<br />
► p5503p2: 968.18 (microsecond / roundtrip)<br />
The value of server p5503p2 is high compared to the other servers. Therefore, the<br />
performance problem of this server seems to be network-related. Looking at the network<br />
configuration shown in Figure 5-17 on page 97, it is clear that the performance problem is<br />
based on the slow network connection.<br />
96 Running SAP Solutions with <strong>IBM</strong> DB2 10 for z/OS on the <strong>IBM</strong> zEnterprise System
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