Tandem Capacity Model (TCM) Manual

c. Select Options > Calculate Now (F12). TCM apportions the database according to the
table you select.
d. Select Options > Protect Admin Fields.
7. To save the modified .AWA file, select Save or Save As from the File tab.
For more information, see “Apportionment Tables” (page 71).
Modifying the Percentile Response Times
TCM can provide the following results for OLTP transactions: average, 90th, 95th, or 99th percentile.
The default is average. If you change from the default (average) to percentile response times, TCM
uses percentile response time for OLTP transactions in all screens of the Performance model.
For example, if the response time is 1 second and average response time is selected, the average
response time of transactions is 1 second. If 90th percentile is selected, 90 percent of the transactions
have a response time of less than or equal to 1 second.
To change to a different response time method:
1. Open a Performance model.
2. Select Options > Select Response Time Method. The Select Response Time Method dialog box
appears.
3. Select the desired response time method. (Average is the default.) Click OK.
4. A Microsoft Excel dialog box confirms the change. Click OK. Close the confirmation dialog
box.
Modifying the Planning Unit
Often a capacity planner needs to model transaction throughputs in units other than transactions
per second (TPS). The planning unit for throughput can be changed by entering another value in
the Planning Unit field on the Capacity Baseline—Actual screen. You can model transactions in
seconds, minutes, hours, days, or months.
To modify the planning unit:
1. Select the highlighted Planning Unit field on the Capacity Baseline—Actual screen.
2. Enter the new unit of time (sec, min, hour, day, month) and press the Return key.
3. Select Options > Calculate Now (F9). To finish entering your data, you must press Return before
clicking Calculate Now or pressing a function key.
Modifying the Transaction Count Table
The Transaction Count table tells TCM how to map category message counts to transaction counts.
In many cases, you can derive the number of messages sent or received by a process category or
some combination of categories.
NOTE: You can use a Transaction Count file instead of a Transaction Count table to count
transactions processed by your application. For information on the Transaction Count file, see
“Transaction Count Table Versus Transaction Count File” (page 120).
If you are using a Transaction Count file, all entries in the Transaction Count table can be zero
(0).
To modify the Transaction Count table:
1. Open a WA model.
2. Log on as an administrator or super user. For more information about this step, see “Changing
Authorization Levels” (page 69).
3. Select Find > Transaction Count Table. If this menu item is unavailable, select Options > Calculate
Now (F12) to update the table and then select Find > Transaction Count Table.
4. Choose Options > Unprotect Admin Fields to unprotect the Transaction Count Table so you
can change its entries. (They are normally protected against modification.)
5. Change the entries in the Transaction Count table to best reflect your application’s
characteristics.
Modifying the Percentile Response Times 243