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Loadrunner Interview Questions and Answers
Throughput
If the throughput scales upward as time progresses and
the number of Vusers increase, this indicates that the
bandwidth is sufficient. If the graph were to remain
relatively flat as the number of Vusers increased, it
would
be reasonable to conclude that the bandwidth is
constraining the volume of
data delivered.
Types of Goals in Goal-Oriented Scenario
Load Runner provides you with five different types of
goals in a goal oriented scenario:
The number of concurrent Vusers
The number of hits per second
The number of transactions per second
The number of pages per minute
The transaction response time that you want your
scenario
Analysis Scenario (Bottlenecks):
In Running Vuser graph correlated with the response time
graph you can see that as the number of Vusers
increases, the average response time of the check
itinerary transaction very gradually increases. In other
words, the average response time steadily increases as
the load increases. At 56 Vusers, there is a sudden,
sharp increase in the average response time. We say that
the test broke the server. That is the mean time before
failure (MTBF). The response time clearly began to
degrade when there were more than 56 Vusers running
simultaneously.
What is correlation? Explain the difference between
automatic correlation and manual correlation?
Correlation is used to obtain data which are unique
for each run of the script and which are generated by
nested queries. Correlation provides the value to avoid
errors arising out of duplicate values and also
optimizing the code (to avoid nested queries). Automatic
correlation is where we set some rules for correlation.
It can be application server specific. Here values are
replaced by data which are created by these rules. In
manual correlation, the value we want to correlate is
scanned and create correlation is used to correlate.
Where do you set automatic correlation options?
Automatic correlation from web point of view, can be
set in recording options and correlation tab. Here we
can enable correlation for the entire script and choose
either issue online messages or offline actions, where
we can define rules for that correlation. Automatic
correlation for database, can be done using show output
window and scan for correlation and picking the
correlate query tab and choose which query value we want
to correlate. If we know the specific value to be
correlated, we just do create correlation for the value
and specify how the value to be created.
What is a function to capture dynamic values in the web
vuser script?
Web_reg_save_param function saves dynamic data
information to a parameter.
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