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Category: Interview Questions

Access Apex Rest API Salesforce from TalenD


Hello Readers,

This is our follow post on Talend Interview Questions, below are the all required steps to access Salesforce data using your own Talend Instance using APEX REST API.

Step 1

In SF go to Setup, Create, Apps. Scroll to bottom of page where it says Connected apps and click new by visiting the given url

Access Apex Rest API Salesforce from TalenD

Access Apex Rest API Salesforce from TalenD


Name can be anything as long as you know what it is, callback URL does not really matter, but use same as example. The important thing is selecting the Access and Manage Your data in scopes.

Step  2

After you create it, Consumer Key and Consumer Secret Values are what you use in Call to OAUTH API. Please see the screenshot below.

Access Apex Rest API Salesforce from TalenD

Access Apex Rest API Salesforce from TalenD


Step 3

After setting up the Connected App in Salesforce, we need to make a call to OAUth API to get token i.e access token. For making the call we need to have cURL installed. There may be other options but I prefer cURL.

 Step 4

One can download the cURL with SSL for one’s OS  and the required certificate of it from the below link

Step 5

Create a cURL folder on your machine and move the cURL.exe and its certificate to that folder. Setup “Path” environment variable of it so that cURL can be accessed from anywhere in command prompt. Please see the screenshot below.

Access Apex Rest API Salesforce from TalenD

Access Apex Rest API Salesforce from TalenD



Step 6

Once the cURL is setup, run the below mentioned command in command prompt to get the access token mentioned in Step 3.

curl –data “grant_type=password&client_id=<insert consumer key here>&client_secret=<insert consumer secret here>&username=<insert your username here>&password=<insert your password and token here>” -H “X-PrettyPrint:1”

Response of this would be something like this


  “id” : “”,

  “issued_at” : “1421777842655”,

  “token_type” : “Bearer”,

  “instance_url” : “https://<instance>”,

  “signature” : “AJjrVtbIpJkce+T4/1cm/KbUL7d4rqXyjBJBhewq7nI=”,

  “access_token” : “00Dc0000003txdz!ARQAQHJEpvN8IcIYcX8.IfjYi0FJ6_JFICLcMk6gnkcHdzMF1DYd2.ZW9_544ro7CnCpO4zzPmkgQ7bE9oFd8yhBALGiIbx7”


Step 7

Use the “access_token” value in tRESTClient in “Bearer Token”. Please see the screenshot below.

Access Apex Rest API Salesforce from TalenD

Access Apex Rest API Salesforce from TalenD


 Step 8

Use 2 tLogRow components, one for showing the success result and the other for displaying any error thrown. Please see the screenshot below



Step 9

Execute the job and you see result as below



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Top Informatica Questions And Answers


Hey Folks, As Discussed in our earlier post this our subsequent post regarding Informatica Interview Questions. please subscribe to get the free copy of PDF with answers and leave a comment.

Informatica Questions And Answers :-

1)   What is the difference between reusable transformation & shortcut created ?
2)   Which one is true for mapplets ( can u use source qyalifier, can u use sequence generator, can you use target) ?
3)   What are the ways to recover rows from a failed session ?
4)   Sequence generator, when u move from development to production how will you reset ?
5)   What is global repository ?
6)   How do u set a variable in incremental aggregation ?
7)   What is the basic functionality of pre-load stored procedure ?
8)   What are the different properties for an Informatica Scheduler ?
9)   In a concurrent batch if a session fails, can u start again from that session ?
10)  When you move from development to production then how will you retain a variable value ?
11)  Performance tuning( what was your role) ?
12)  what are conformed dimensions?
13)  Can you avoid static cache in the lookup transformation? I mean can you disable caching in a lookup transformation?
14)  What is the meaning of complex transformation?
15)  In any project how many mappings they will use(minimum)?
16)  How do u implement un-connected Stored procedure In a mapping?
17)  Can you access a repository created in previous version of Informatica?
18)  What happens if the info. Server doesn’t find the session parameter in the parameter file?
19)  How did you handle performance issues If you have data coming in from multiple sources, just walk through the process of loading it into the target
20)  How will u convert rows into columns or columns into rows
21)  What are the steps involved in the migration from older version to newer version of Informatica Server?
22)  What are the main features of Oracle 11g with context to data warehouse?
24)  How to run a session, which contains mapplet?
25)  Differentiate between Load Manager and DTM?
26)  What are session parameters ? How do you set them?
27)  What are variable ports and list two situations when they can be used?
28)  Describe Informatica Architecture in Detail ?
29)  How does the server recognise the source and target databases.
30)  What is the difference between sequential batch and concurrent batch and which is recommended and why?
31)  A session S_MAP1 is in Repository A. While running the session error message has displayed
‘server hot-ws270 is connect to Repository B ‘. What does it mean?
32)  How do you do error handling in Informatica?
33)  How can you run a session without using server manager?
34)  Consider two cases:
1. Power Center Server and Client on the same machine
2. Power Center Sever and Client on the different machines
what is the basic difference in these two setups and which is recommended?
35)  Informatica Server and Client are in different machines. You run a session from the server manager by specifying the source and target databases. It displays an error. You are confident that everything is correct. Then why it is displaying the error?
36)  What is the difference between normal and bulk loading? Which one is recommended?
37)  What is a test load?
38)  How can you use an Oracle sequences in Informatica? You have an Informatica sequence generator transformation also. Which one is better to use?
39)  What are Business Components in Informatica?
40)  What is the advantage of persistent cache? When it should be used.
41)  When will you use SQL override in a lookup transformation?

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Top Informatica Questions Asked In Interviews

Hi Folks , from this post onwards we will be posting some Top Informatica Questions that are generally being asked in Interviews.

1. How do u change parameter when u move it from development to production. ?
2. How does the session recovery work. ?
3. why use shortcuts(Instead of making copies). ?
4. where is the reject loader and how to use it. ?
5. Do you have to change the reject file before using reject
loader utility. ?
6. Differences between current and previous versions. ?
7. Debugger – what are the modules, what are the options
you can specify when using debugger, can you change the
expression condition dynamically when the debugger is running ?
8. Mapplets – can you use an active transformation in a Mapplet ?
9. What are active transformations?
10. Can u use flat files in Mapplets ?
11. How many transformations can be used in mapplets. Is there any specified limit ?
12. Can a joiner be used in a mapplet?
13. How can you join 3 tables? Why cant you use a single Joiner to join 3 tables
14. Global and Local shortcuts. Advantages.
15. Mapping variables, parameters syntax, if you create mapping variables
and parameters in mapplet can u use them in the mapping?
16. Have you worked with/created Parameter file
17. What’s the layout of parameter file (what does a parameter file contain?)?
18. Why do we use Mapping Parameter and mapping variable?
19. Session Recovery. 1000 rows in the source of which 500 passed
through and then I killed the session. Can you perform a recovery and how ?
20. What are the modules in Power Center ?
21. filter transformation in the condition one of the data is NULL would the record be dropped.?
22. Implement all three SCD’s using Informatica and with different approaches. ?
Please Leave your comment if you have any query
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Simple Informatica Scenarios – Part 1

Informatica Interview Questions

We have decided to come up with some common scenarios in Informatica , this would be an ongoing post where-in we would be adding common issues faced by an informatica developer.We would be introducing complex scenarios as we move ahead. Please feel free to discuss these scenarios in the comment section below .

1)How to  Concat row data through informatica?


Ename EmpNo
stev 100
methew 100
john 101
tom 101


Ename EmpNo
Stev methew 100
John tom 101


Using Dynamic Lookup on Target table:

If record doen’t exit do insert in target .If it is already exist then get corresponding Ename vale from lookup  and concat in expression with current Ename value then update the target Ename column using update strategy.

Using Var port Approch:

Sort the data in Source Qualifier  based on EmpNo column then Use expression to store previous record information using Var port after that use router to insert a record if it is first time if it is already inserted then update Ename with concat value of prev name and  current name value then update in target.

2) How to send Unique (Distinct) records into One target and duplicates into another target?


Ename EmpNo
stev 100
Stev 100
john 101
Mathew 102



Ename EmpNo
Stev 100
John 101
Mathew 102


Ename EmpNo
Stev 100


Using Dynamic Lookup on Target table:

If record doen’t exit do insert in target_1 .If it is already exist then send it to Target_2 using Router.

Using Var port Approch:

Sort the data in sq  based on EmpNo column then Use expression to store previous record information using Var ports after that use router to route the data into targets  if it is first time then sent it to first target  if it is already inserted then send it to Tartget_2.


Below is the solution for processing multiple flat files into table using informatica.

3) How to Process multiple flat files to single target table through informatica if all files are same structure?

We can process all flat files through one mapping and one session using list file.

First we need to create list file using unix script  for all flat file the extension of the list file is .LST.

This list file it will have only flat file names.

At session  level  we need to set

source file directory  as list file path

And source file name as list file name

And file type as indirect.


This is also One of the advanced feature in Informatica 8.

4) How to populate file name to target while loading multiple files using list file concept.

In informatica 8.6 by selecting Add currently processed flatfile name option in the properties tab of source definition after import source file defination in source analyzer.It will add new column as currently processed file name.we can map this column to target to populate filename.


5)How to load unique or distinct records from flat file to target?

Ans:Using Aggregator we can load unique records by setting group by on all columns this is one approach

Another method is we can use sorter after source qualifier in sorter  we can use distinct option.


6) How to load first record and  last record in to target  from a file  using Informatica?


Step 1.

Create  one mapping variable like $$Record_Count and create one Sequence Generator transformation with reset option  then use filter transformation .

In filter transformation put condition like below.

Seq.NEXT  Value =1  or  Seq.NEXT  Value =$$Record_Count

Step 1. Use  Unix script to create/update  parameter file with file record count (wc –l) .this parameter file will supply the value to mapping variable  $$Record_Count

Below is the order of the tasks.

Wf——-àcommand task——-àmain session

Command task—To execute unix script


7)How to  add a lengthy query in the source qualifier,if the query length exceeds 32K characters ?

If you are trying to use a very length query in the SQ over-ride, there seems to be a character limit for this. This is something around 32K characters.
This must be mainly due to limitation of saving this query as metadata in underlying database repository.
This issue can be solved by writing this query as a parameter value in the param file.
Since the query will be fetched dynamically, the limitation will not be an issue.

Note – Ensure that the query is written in one single line in the parameter file.



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