6. DATA SOURCES › 6.3 Correlating Data Sources › 6.3.11 CA NetSpy Data Considerations › 6.3.11.4 Calculating Total Response Time

6.3.11.4 Calculating Total Response Time

It is possible that not all response events have network
response time measured for them.  This will be true if the CA
NetSpy FORCEDR (force definite response) option associated
with the APPL parameter is valued at less than 100 (100
indicates that 100 percent of all transactions will have the
definite response option activated; 80 indicates that only 80
percent of the responses will have definite response
activated, etc.).  This will also be true if FORCEDR is not
used at all, and not all application transactions use
definite response.

CA MICS Network Analyzer provides for this in its calculation
of total response time and average total response time.

Total network response time is calculated as follows.  First,
average network response time is calculated as the network
response time measured by CA NetSpy divided by the number of
network response events.  Then, the average network response
time is multiplied by the total number of responses.  Total
number of responses is set to the greater of network and host
responses.  So, when there are fewer network responses, the
CA MICS Network Analyzer simply obtains the average network
response and calculates an "approximation" of total network
response.  The measured network response time is kept in
fields NSPNRSTM and NSSNRSTM.  The calculated value is
maintained in fields NSPCNRTM and NSSCNRTM.

Total response time is calculated as the sum of host response
time and "calculated" network response time.  The average
total response time results from dividing total responses
into average total response time.