Data Warehouse Interview Questions
Questions Answers Views Company eMail

What happen if you have 3 ports in SQ and 4 ports in SQL override of SQ( provided all ports are in same order and they are connected with proper source and target)? Also what happens when I have 4 ports and will extract 3 values in SQloverride.. What will be the value in 4th port ?

CTS,

1163

how lookup transformation is made active in new versions... When to use connected and when to use unconnected lookup and why? which is good for session performance. How to make lookup persistent and how to remove stale data from that lookup. how commit works - when we stop or abort data. Explain in both cases. What is factless fact table and have you ever used it in real time scenarios.

CTS,

1228

I have 10 columns in a flat file and 10 rows corresponding to that columns. I want column number 5 and 6 for last five records. In unix as well as informtica.

CTS,

1180

What if i will group by with some port in aggregator and will not pass the sorted values. Will the session fails tell in both cases ( if i have configured it for sorted input and if i have not configured it for sorted input).

CTS,

1 1542

How to write a expression to display the first letter in Caps in each word using transformer stage ? Please let me know ASAP Thanks in advance...

Alpharithm Technologies,

1060

How to load specific no.of records using bteq, or fastload,or multiload

Infosys,

1297

What is the difference between a utility and api in a RUN SQL component

Accenture,

1 6745

What is use Array size in datastage

1271

can i any one explain me realtime healthcare project explanation..for interview .iam new to informatica .thanks in advance.

3297

Hi, Please tell me how to solve this scenario in datastage ? Here we have 3 columns in a table TEST CODE,ENTRY DATE and BATCH The table looks like CODE ENTRYDATE BATCH 100 100716 1 100 100716 1 100 100716 1 200 122517 2 200 122517 2 302 555555 8 302 555555 8 302 555555 8 We need to create a seqno on grouping these 3 columns. The result should be like this. CODE ENTRYDATE BATCH SEQNO 100 100716 1 1 100 100716 1 2 100 100716 1 3 200 122517 2 1 200 122517 2 2 302 555555 8 1 302 555555 8 2 302 555555 8 3

Alpharithm Technologies,

1 2554

Workflow is long running due to long running sql query so when we refer the query plan it tells the issue is due to partition of the db table. How to handle this?

1214

If the job aborted in a sequencer, how can we start that from the previews successful job.

SLK Software,

1 2629

What is the size of database for you project?

Accenture,

1087

we have a list of 80,000 records, i would like to display in excel sheet but excel sheet has capacity of 60000 record.. how you going to display?

Accenture,

2 1879

New coloums are added in database, then how you know in report level

Accenture,

1130


Un-Answered Questions { Data Warehouse }

Explain Association algorithm in Data mining?

1849


Mention a few design and development best practices for informatica?

536


What is the difference between project backlog and product backlog?

1011


Compare aggregates and data marts

2250


what are the limitations of cognos reportnet? What are the enhancements in reportnet ?

595






what is the difference steps for data modeling?

1565


what is the use of skid in reporting?

1928


What is PDV?

701


What are the key columns in Fact and dimension tables?

530


Performance tuning in UNIX for informatica mappings?

2106


When do we analyze the tables?

515


What is the difference between snowflake and star schema?

564


Can you suggest us materials for sdtm mapping?

4015


What are different types of metrics in microstrategy?

533


How teradata makes sure that there are no duplicate rows being inserted when its a set table?

540