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Loadrunner Interview Questions and Answers
Explain the Configuration of your systems?
The configuration of our systems refers to that of
the client machines on which we run the Vusers. The
configuration of any client machine includes its
hardware settings, memory, operating system, software
applications, development tools, etc. This system
component configuration should match with the overall
system configuration that would include the network
infrastructure, the web server, the database server, and
any other components that go with this larger system so
as to achieve the load testing objectives.
How do you identify the performance bottlenecks?
Performance Bottlenecks can be detected by using
monitors. These monitors might be application server
monitors, web server monitors, database server monitors
and network monitors. They help in finding out the
troubled area in our scenario which causes increased
response time. The measurements made are usually
performance response time, throughput, hits/sec, network
delay graphs, etc.
If web server, database and Network are all fine where
could be the problem?
The problem could be in the system itself or in the
application server or in the code written for the
application.
How did you find web server related issues?
Using Web resource monitors we can find the
performance of web servers. Using these monitors we can
analyze throughput on the web server, number of hits per
second that
occurred during scenario, the number of http responses
per second, the number of downloaded pages per second.
How did you find database related issues?
By running “Database” monitor and help of “Data
Resource Graph” we can find database related issues.
E.g. You can specify the resource you want to measure on
before running the controller and than you can see
database related issues
What is the difference between Overlay graph and
Correlate graph?
Overlay Graph: It overlay the content of two graphs
that shares a common x-axis. Left Y-axis on the merged
graph show’s the current graph’s value & Right Y-axis
show the value of Y-axis of the graph that was merged.
Correlate Graph: Plot the Y-axis of two graphs against
each other. The active graph’s Y-axis becomes X-axis of
merged graph. Y-axis of the graph that was merged
becomes merged graph’s Y-axis.
How did you plan the Load? What are the Criteria?
Load test is planned to decide the number of users,
what kind of machines we are going to use and from where
they are run. It is based on 2 important documents, Task
Distribution Diagram and Transaction profile. Task
Distribution Diagram gives us the information on number
of users for a particular transaction and the time of
the load. The peak usage and off-usage are decided from
this Diagram. Transaction profile gives us the
information about the transactions name and their
priority levels with regard to the scenario we are
deciding.
What
does vuser_init action contain?
Vuser_init action contains procedures to login to a
server.
What does vuser_end action contain?
Vuser_end section contains log off procedures.
What is think time? How do you change the threshold?
Think time is the time that a real user waits between
actions. Example: When a user receives data from a
server, the user may wait several seconds to review the
data before responding. This delay is known as the think
time. Changing the Threshold: Threshold level is the
level below which the recorded think time will be
ignored. The default value is five (5) seconds. We can
change the think time threshold in the Recording options
of the Vugen.
What is the difference between standard log and extended
log?
The standard log sends a subset of functions and
messages sent during script execution to a log. The
subset depends on the Vuser type Extended log sends a
detailed script execution messages to the output log.
This is mainly used during debugging when we want
information about: Parameter substitution. Data returned
by the server. Advanced trace.
Explain the following functions: - lr_debug_message
The lr_debug_message function sends a debug message to
the output log when the specified message class is set.
lr_output_message - The lr_output_message function sends
notifications to the Controller Output window and the
Vuser log file. lr_error_message - The lr_error_message
function sends an error message to the LoadRunner Output
window. lrd_stmt - The lrd_stmt function associates a
character string (usually a SQL statement) with a
cursor. This function sets a SQL statement to be
processed. lrd_fetch - The lrd_fetch function fetches
the next row from the result set.
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