Q251.
How you identify Performance test use cases of any application?
Answer:
Test
cases/Uses cases for Performance test are almost same as any
manual/functional testing test cases where each and every step
performed by the user is written. The only difference is that all
manual test cases can’t be Performance testing use cases as there
are few criteria for the selection as:
I.
The user activity should be related to the critical and most
important functionality of the application.
II.
The user activity should be having a good amount of database activity
such as search, delete or insert.
III.
The user activity should be having good user volume. The
functionality having less user activity is generally omitted from
Performance testing point of view. e.g admin account activity.
Any
of the manual test cases that fulfill the above criteria can be used
as performance testing use case/test case. If manual test cases are
not written step by step, Performance team should create dedicated
documents for them.
Q252.
While
scripting you created correlation rules for automatic correlation. If
you want to share the correlation rules with your team member
working on the same application so that he/she can use the same on
his workstation, how will you do that?
Answer:
Correlation
rules can be exported through the “.cor“ file and the same file
can be imported through VuGen.
Q253.
What is the Modular approach of scripting?
Answer:
In
Modular approach, a function is created for each request (e.g. login,
logout, save, delete, etc.) and these functions are called wherever
required. This approach gives more freedom to reuse the request and
saves time. With this approach, it is recommended to work with web
custom request.
Q254.
How
is VuGen script modified after recording?
Answer:
Once
the script is recorded, it can be modified with the following
process:
Transaction
Parameterization
Correlation
Variable
declarations
Rendezvous
Point
Validations/Checkpoint
Q255.
What is Ramp up and Ramp Down?
Answer:
Ramp
up- Rate at which virtual users add to the load test
Ramp
Down- Rate at which virtual users exit from the load test.
Q256.
What
is the advantage of running the Vuser as the thread?
Answer:
Running
vusers as thread helps generate more virtual users from any machine
due to small memory print of the vuser running a thread.
Q257.
What is wasted time in VuGen Replay log?
Answer:
Waste
time is never performed by any browser user and just the time spent
on the activities which support the test analysis. These activities
are related to logging, keeping record and custom analysis.
Q258.
How do you enable text and image checks in VuGen?
Answer:
This
can be done by using functions web_find (for text check) and
web_image_check (for image check) and enabling image and text check
from runtime setting.
Run
Time Setting–>Preference–>Enable the Image and text check
box.
Q259.
What is the difference between web_reg_find and web_find?
Answer:
web_reg_find
function is processed before the request sent and is placed before
the request in the VuGen script whereas a web_find function is
processed after the response of the request come and is placed after
the request in VuGen script.
Q260.
What are the challenges that you will face to script the step “Select
All” and then “Delete” for any mail account?
Answer:
In
this case, the post for “Select All” and “Delete” will change
every time depending on the number mails available. For this the
recorded request for the two should be replaced with the custom
request and string building is required to build the post. (Note-
This Qneeds practical knowledge. So please this practically and
formulate your answer).
Q261.
What is a difference between pacing and think time?
Answer:
Pacing
is the wait time between the action iterations whereas thinking the
time is a wait time between the transactions.
Q262.
What
is the number of graphs you can monitor using Controller at a time?
What is the max of them?
Answer:
One,
two, four and eight graphs can be seen at a time. The maximum number
of graphs can be monitored in at a time is 8.
Q263.
You have an application which shows the exam results of the student.
Corresponding to name of each student its mentioned whether he
passed or failed the exam with the label of “Pass” and “Fail”.
How will you identify the number of passed and failed student in
VuGen script?
Answer:
For
this text check is used for the web page for the text “Pass and
“Fail”. Through the function web_reg_find, we can capture the
number of texts found on the web page with the help of “SaveCount”.
SaveCount stored the number of matches found. For example-
web_reg_find("Text=Pass","SaveCount=Pass_Student",
LAST);
web_reg_find("Text=Fail",
"SaveCount=Fail_Student",LAST);
Q264.
During
the load test, what is the optimum setting for Logs?
Answer:
For
the load test log level is set to minimal. This can be achieved by
setting the log level to the standard log and selecting the radio
button “Send a message only when an error occurs”.
Q265.
How will you handle the situation in scripting where for your mailbox
you have to select any one mail randomly to read?
Answer:
For
this we will record the script for reading the first mail. Try to
find what is being posted in the request to read the first mail such
as mail ids or row no. From the post where a list of emails is
reflecting, we will try to capture all the email ids row no with
correlation function and keeping Ordinal as All i.e. ORD=All. Replace
the requested email id in the read post with any of the randomly
selected email id from the list of captured email ids.
Q266.
How is Automated Correlation configured?
Answer:
Any
setting related to Automated Correlation can be done by General
Options->Correlation. Correlation rules are set from Recording
options->Correlations.
Q267.
How do you decide the number of load generator machine required to
run a test?
Answer:
Number
of load generator required totally depends on the protocol used to
create the script and configuration of the load generator machine.
Each protocol has different memory print and this decides how many
virtual users can be generated from the give configuration of the
machine (load generator).
Q268.
What
are the capabilities exactly you look for while selecting the
performance testing tool?
Answer:
Performance
testing tool should capable of:-
Testing
an application built using multiple technologies and hardware
platforms.
Determine
the suitability of a server for testing the application
Testing
an application with a load of tens, thousand and even thousands
virtual users.
Q269.
How does caching affect performance testing results?
Answer:
When
data is cached in server`s memory, the server need not fetch the
result and no server activity triggered. Test result does not reflect
the same performance of real user using the application with
different data.
Q270.
How will you stop the execution of a script on error?
Answer:
This
can be achieved through lr_abort function. The function instructs the
vuser to stop executing Action section and end the execution by
executing the vuser_end section. This function is helpful in handling
a specific error. This can also be used to handle a situation rather
than error where execution is not possible. The function assigned
“Stopped” status to the vuser which stopped due to lr_abort
function. In Run-Time setting, “Continue on error” should be
unchecked.
Q271.
Can’t we conduct the performance testing without tool?
Answer:
We
can conduct the performance testing without a tool. In realistic
environment application accessed by 1,00,000 people, to simulate the
realistic environment we have to require 1,00,000 people, which is
not possible to require these many resources.
Below
are the constraints stopping us to conduct the PT without tool.
-
Accuracy
-
Time
-
Budget
-
Resources
To
over come the above issue. We have to use tools instead of manual
resources.
Q272.
What is your approach to gather NFR, if client doesn’t know
anything about performance testing? If Application is already in
production
Answer:
Get
the production log files for 1 year historical data using Site
analytical tools (or) splunk tool & try to identify top 5 usage
days from that how many no. of visitors accessing that application,
how many no. of page views are happening, which JSP/ASP pages are
mostly accessed by end users & from which region they are
accessing the application.
Based
on the visitors you can identify no. of users, based on the page
views you can
identify
no. of transactions.
Based
on the JSP/ASP pages you can identify the CBT’s, based on the IP
address we can
identify
the location/region &conduct baseline testing to identify the
expected response time (or) to baseline the application.
Q273.
If the LB or RB is keep on changing. What is your approach to capture
the dynamic value?
Answer:
Sol-1:
If the dynamic LB is static use “Save offset” argument.
Sol-2:
Use Flag system.
Flag
System:
Any
dynamic number is a part of LB we can use Flag System.
Ex-1:
H1I tvs Welcome.
H2I
suzuki Welcome.
Sol:
web_reg_save_param(“parametername”,”LB/DIG=H#I”,”RB=Welcome”,LAST);
Q274.
What is
your approach if LB or RB isn’t present for a dynamic value?
Answer:
If
the LB isn’t available take any static text from the above line
pass it as a LB & identify
exact
LB from the capture value & pass it as LB.
If
the RB isn’t present in the dynamic value take any static text from
the below line & pass it as a RB & identify exact RB from the
capture value & pass it as a RB.
Q274.
Why
correlation function is keep on failing?
Answer:
1.
Invalid LB or RB.
2.
Function location might be wrong.
3.
May be your trying to capture more than 256 characters.
4.
May be the dynamic value itself not available the response.
Q276.
If the
dynamic value isn’t present in the response or it is a hidden
value?
Answer:
Use
web_add_cookie( ) to pass the dynamic value.
Q277.
How many
ways I can find image name?
Answer:
1)
Open application --- Right click and Choose view source
2)
Navigate to snapshot
3)
In generation log
4)
Full mode of replay log
Q278.
How can I
find how many times text is present in response?
Answer:
“savecount”
will let you know the count of the text
Q279.
Difference
between web_reg_find and web_find?
Answer:
|
Web_reg_find
|
Web_find
|
|
verification
in runtime settings
|
Q280.
How to
convert an integer value to LR variable?
Answer:
“itoa”
--------It converts integer to string
Lr_eval_string
------- It reads the value from a variable
Lr_output_message
----------It displays the message
Q281.
How to
compare two LR variables?
Answer:
lr_save_string(lr_paramarr_random("c_source"),"Ran_Source");
lr_save_string(lr_paramarr_random("c_desti"),"Ran_Dest");
if(strcmp(lr_eval_string("{Ran_Source}"),lr_eval_string("{Ran_Dest}"))==0)
{
lr_output_message("SOURCE
& DESTINATIONS ARE SAME, CAN’T BOOK TICKET");
lr_abort();
}else
{
lr_output_message("SOURCE
& DESTINATIONS ARE NOT SAME, CAN BOOK TICKET");
}
Q282.
How to
write a value to a local file?
Answer:
long
file;
After
response body we have to write below operations
file=fopen("D:\\vny_src.txt","a+");
fprintf(file,"SESSION
ID : %s\n",lr_eval_string("{c_sid}"));
fclose(file);
Q283.
what is
the difference between get and post method?
Answer:
|
Get
|
post
|
|
1.
Not a secured request
2.
It will send small amount of information to server
3.
It can be available in history, cached and bookmarks.
4.
To retrieve the information
|
1.
It’s a secured request
2.
Sends large amount of information
3..
It can’t be available in history, cached and bookmarks.
4.
To submit the data to server
|
Q284.
How to
capture download size for a response?
Answer:
web_get_int_property(HTTP_INFO_DOWNLOAD_SIZE);
Q285.
How to
add header information?
Answer:
Step
1: Right click on request and choose snapshot view
Step
2: Verify record time and replay time headers
Step
3: If there is a difference, please add information using
web_add_header() function.
Q286.
How to
read a value from a local file?
Answer:
char
buffer[100];
long
file;
file
= fopen(“C:\\xyz.txt”,”r+”);
freadf(buffer,sizeof(char),
20, file);
lr_save_string(buffer,
“read_value”);
return
0;
Q287.
What are
the few c functions you used in your carrier?
Answer:
1.
strcpy() -----Copies one string to another
2.
strcmp()------Compares two strings
3.
strcat()-------Concatenates two strings
4.
strlen()------Returns length of the string
5.
strstr()-------Captures substring from main string
6.
strtok()------Tokenize the string based on delimeter
7.
strncpy()-----Copies n number of characters to another
8.
sprint()------Writes a formatted output to a string
Q288.
How to
create a framework in LR?
Answer:
Step
1: Open the notepad.
Step
2: Write the statements into notepad.
Step
3: Save it as “.h” file.
Q289.
In one of
my business scenario, user has to login to application once and has
to perform business scenario 05imes, then logoff from application?
What is your approach?
Answer:
To
achieve above scenario:
Record:
Login
procedure into vuser_init()
Business
procedures into action().
Logoff
procedure into vuser_end().
Q290.
In which
scenario you are going to use URL mode?
Answer:
Scenario
1: My application is a non browser specific application. So we use
URL mode to make ensure that all resources should be downloaded.
Scenario
2: My application downloading lot of java files for every page. So we
use URL mode to make ensure that every java script file has to be
downloaded
Q291.
Application
is launching, events are generating but script is not available in
the vugen physically?What is the problem?
Answer:
Solution
1: Problem might be SSL encryption.
Solution
2: Problem might be with browser compatibility.
Q292.
How many
places you can find server response?
Answer:
-
Full mode of replay log.
-
Generation log.
-
Snapshot view.
-
Tree view.
-
Empty LB and empty RB function.
Q293.
How to
pass value from one script to another?
Answer:
Solution
1: Create two actions in one script for both of the scenarios.
Capture purchase order number from 1 st action and pass into the
second action.
Solution
2: Using VTS also we can do and also with data stagging also we can
Q294.
What is
regular expression ? When we have to use this?
Answer:
When
ever the boundaries are dynamically changing at that to extract
dynamic value we will use this function.
Syntax
is web_reg_save_param_regex(“pname = reg_exp”,
“regex=name
=”(.*?)” , LAST);
Q295.
While
running the test how to verify whether load balancing is happening
properly aren't?
Answer:
While
running the test we have to monitor resource utilization (C.P.U and
Memory) each and every instance. If all the instances are using same
level of C.P.U and memory, then we can conclude that LB is happening
properly. If any one of the instance reporting less C.P.U memory
utilization then we have to conclude LB is not happening properly.
Q296.
What are
the actions you can perform while running the test?
Answer:
1.
Add the users.
2.
Delete or kill the users.
3.
Add the script.
4.
Disable or delete the script.
5.
Verify the user runtime viewer.
6.
Verify the user log.
7.
Verify how many users running currently.
8.
Add or change the LG for down status users.
9.
Identifying which transactions are passing and failing.
Q297.
Where do
you place the think time?
Answer:
We
should not place the think time in between start and end transaction.
Q298.
How to
pass a new value in to the script without opening the script?
Answer:
char
* server;
server
= lr_get_attrib_string(“host”);
lr_save_string(server,”url”);
Write
the above statement in the script.
Set
the value in the RTS and pass vary arguments in runtime.
Q299.
What is
Little’s law?How we can apply to this to testing?
Answer:
In
testing environment the requests flow will be like a queue to the
server . So that we can apply littles law.
If
we applied littles law …….. As per this law
No.
of users = TPS * time
Q300.
How to
add multiple load generators for single script?
Answer:
Select
the group
Click
on vusers
Add
new LGs against vusers
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