Best Practices for SAP BI using DB2 9 for z/OS - IBM Redbooks

that the query runs against → Maintain Aggregates. At the top of the window
select Propose → propose (statistics, usually query).
Enter a time range in the pop-up window. BW analyzes the queries run against
this InfoCube, lists existing aggregates, and proposes new aggregates and the
number of queries that would benefit from the proposed aggregate.
8.3.3 Front-end processing time
In this section we discuss how to identify whether your query response time is
being impacted adversely by slow network front-end processing on a user’s
personal computer. We discuss which response time components to look for
when analyzing the query response time components in ST03.
From the query response time breakdown in ST03, the column that records the
time taken in the network and the front-end PC is entitled Frontend. In the table
RSDDSTAT, the column that records this time is entitled QTIMEEXCEL.
This time measurement starts as soon as the data has been formatted in the BW
server and is sent to the front-end Excel® application (Bex). As soon as the
front-end (Bex) has inserted all the data into the worksheet, the time
measurement ends. Therefore, this time includes all network time and the time
taken to process and present the results in the front-end personal computer.
Further analysis
If the front-end processing time is lengthy, then you can do further analysis to
determine which subcomponent is contributing the most time. Follow this
process.
Find the IP address of the front-end personal computer that the user is logged on
to by using the transaction AL08. In the output display of AL08, you will see the
user’s front-end address in the column entitled Terminal.
After obtaining the terminal address, you can go to the next step. To check the
connection between the BW server and the user’s PC, use the following menu
path: ST06 → Additional Functions → LAN check by Ping and select
Presentation server.
You will be presented with a list of connected presentation (front-end) servers.
Highlight the server found in the AL08 transaction by clicking the name and then
click the Pick button at the top of the window.
You can now ping that presentation server to check the network response time
between the BW application server and the presentation server. If this time is
excessive, contact your network support group for more detailed investigation.
164 Best Practices for SAP BI using DB2 9 for z/OS