Interview Questions

Q:

Why interface method is always public?

Answer

To make this method available to every implementation class

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Subject: Java
Job Role: IT Trainer

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Q:

What is a DB2 plan?

Answer

An application plan or package is generated by the bind to define an access path. 

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Q:

Why are commercial advertisements made?

A) To convince the viewer to buy a product B) To confuse the viewer about the different products in market
C) To dissuade the viewer from buying a product D) To highlight the flaws of a product
 
Answer & Explanation Answer: A) To convince the viewer to buy a product

Explanation:

Commercial advertisements are created for the purpose of raising the awareness of the public on a company's products or services.

 

* It is very important for a business to have its goods and services known to the public.

 

* It can greatly boost its sales by attracting more csutomers which in effect helps a company grow and become successful.

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Filed Under: Advertising and Media
Exam Prep: AIEEE
Job Role: Analyst

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Q:

If I call performSelector:withObject:afterDelay: – is the object retained?

Answer

Yes the object is retained. It creates a timer that calls a selector on the current threads run loop. It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector.

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Q:

Explain about various caches available in Data Integrator

Answer

  •  NO_CACHE – It is used for not caching values.

  •  PRE_LOAD_CACHE – Result column preloads and compares the column into the memory, prior to executing the lookup.

  •  PRE_LOAD_CACHE is used when the table can exactly fit in the memory space.

  •  DEMAND_LOAD_CACHE – Result column loads and compares the column into the memory when a function performs the execution.

  •  DEMAND_LOAD_CACHE is suitable while looking up the highly repetitive values with small subset of data.

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Q:

What type of Joins have you used?

Answer

The knowledge of Joins is a MUST for every interviewee. Most SQL programmers have used inner join and  outer join[left/right]; but the catch point here is to also mention cross join and self-join.


 

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Subject: SQL

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Q:

What is Overloading Polymorphism?

Answer

Overloading allows multiple functions to exist with same name but different parameters. Again if you take bike as an example, it has a function “Start” with two forms i.e. ’Auto Start’ and ’kick start’.

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Subject: Java

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Q:

What are the factors that are addressed to integrate data?

Answer

Following are the data integration factors:


- Sub set of the available data should be optimal. 


- Noise/distortion estimation levels because of sensory/processing conditions at the time of data collection.


- Accuracy, spatial and spectral resolution of data.


- Data formats, storage and retrieval mechanisms.


- Efficiency of computation for integrating data sets to reach the goals.

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