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Loadrunner Interview Questions and Answers
What is a rendezvous point?
You insert rendezvous points into Vuser scripts to
emulate heavy user load on the server. Rendezvous points
instruct Vusers to wait during test execution for
multiple Vusers to arrive at a certain point, in order
that they may simultaneously perform a task. For
example, to emulate peak load on the bank server, you
can insert a rendezvous point instructing 100 Vusers to
deposit cash into their accounts at the same time.
What is a scenario?
A scenario defines the events that occur during each
testing session. For example, a scenario defines and
controls the number of users to emulate, the actions to
be performed, and the machines on which the virtual
users run their emulations.
Explain the recording mode for web Vuser script?
We use VuGen to develop a Vuser script by recording a
user performing typical business processes on a client
application. VuGen creates the script by recording the
activity between the client and the server. For example,
in web based applications, VuGen monitors the client end
of the database and traces all the requests sent to, and
received from, the database server. We use VuGen to:
Monitor the communication between the application and
the server; Generate the required function calls; and
Insert the generated function calls into a Vuser script.
Why do you create parameters?
Parameters are like script variables. They are used
to vary input to the server and to emulate real users.
Different sets of data are sent to the server each time
the script is run. Better simulate the usage model for
more accurate testing from the Controller; one script
can emulate many different users on the system.
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.
How do you find out where correlation is required? Give
few examples from your projects?
Two ways: First we can scan for correlations, and see
the list of values which can be correlated. From this we
can pick a value to be correlated. Secondly, we can
record two scripts and compare them. We can look up the
difference file to see for the values which needed to be
correlated. In my project, there was a unique id
developed for each customer, it was nothing but
Insurance Number, it was generated automatically and it
was sequential and this value was unique. I had to
correlate this value, in order to avoid errors while
running my script. I did using scan for correlation.
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.
When do you disable log in Virtual User Generator, When
do you choose standard and extended logs?
Once we debug our script and verify that it is
functional, we can enable logging for errors only. When
we add a script to a scenario, logging is automatically
disabled. Standard Log Option: When you select
Standard log, it creates a standard log of functions and
messages sent during script execution to use for
debugging. Disable this option for large load testing
scenarios. When you copy a script to a scenario, logging
is automatically disabled Extended Log Option: Select
extended log to create an extended log, including
warnings and other messages. Disable this option for
large load testing scenarios. When you copy a script to
a scenario, logging is automatically disabled. We can
specify which additional information should be added to
the extended log using the Extended log options.
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