Skip to main content

Data Warehousing Interview Questions


Data Warehousing Interview Questions
1) Explain some disadvantages of data ware house?
These are some of the disadvantages of data ware house: -
1) It represents a very large project with a very broad scope which is a big disadvantage.
2) Upfront costs are very huge and the duration of the project from the start to the end user is significant.
3) It is inflexible and unresponsive to the departmental needs.
2) Explain about the top design?
In a top design model data ware house is designed in a normalized enterprise model. This is chiefly used for business intelligence and management capabilities. Data used for business purpose and management can be met through a data ware house. It is used to generate dimensional views and is known to be good and stable against business changes.
3) Explain about the non-volatile feature of data ware house?
Data once written and saved in data ware house is static and it can never be deleted and over written once confirmed. It will be static and read-only. This can be used for future reporting and it allows good security feature.
4) What are the different interconnected layers of a data ware house?
There are four different interconnected layers they are: -
• Operational database layer
• Informational access layer
• Data access layer
• Meta data layer.
5) What do you know about Data warehousing?
Data warehousing is used for reporting and analysis of the data. It is primarily used to analyze data. Some of the additional uses of it are extraction and retrieval of data, manage, load and manipulate data. It has various tools which can transform, load, extract and manage the data.
6) Explain about the time variant feature of Data ware housing?
Data ware house detects and tracks all the changes according to time. This allows a database developer to detect the changes across time which helps him to keep a log.
7) Explain about the top design?
In a top design model data ware house is designed in a normalized enterprise model. This is chiefly used for business intelligence and management capabilities. Data used for business purpose and management can be met through a data ware house. It is used to generate dimensional views and is known to be good and stable against business changes.
icon cool Data Warehousing Interview QuestionsExplain about hybrid design model?
Due to the various risks and disadvantages presented by top down and bottom down models it has become imperative that Hybrid methodologies be used. This is used for fast turn around time and enterprise wide data consistency. This uses features and benefits from top down and bottom down models.
9) State some of the disadvantages of data ware houses?
Some of the disadvantages are as follows: -
1) Data ware house can be costly due to high maintenance of the database. It is usually not static.
2) There is always a risk of it delivering outdated results which makes it less productive.
3) A fine line exists between data ware house and operational systems.
10) Explain about the bottom up design?
Bottom up design provides the advantage of a quick turnaround. As soon as the first data marts are created business values can be returned. Some of the disadvantages caused are due to multiple versions and false truth operations. Conforming dimensions and tight management can mitigate these risks.
11) State some of the benefits of data ware housing?
These are some of the benefits of data ware housing they are: -
1) Regardless of the data source it provides common data model this feature makes analysis of data much easier.
2) Inconsistency is identified during the loading process.
3) In case there is a crash of the database, database programmer can feel comfortable because it is stored in the data ware housing.4) It is very efficient and will not slow down the operational system.
12) What do you think about the future of data ware housing?
Data ware housing will be used by organizations to analyze their huge pool of data.With the development of various data ware house appliances performance of data ware housing applications can be improved. There would be many more apps working in accordance with the Gartner Group report which makes it much user friendly and reliable.
13) State two major differences between a data ware house and operational data ware house?
There exist two major differences they are: -
1) It integrates information from a pre existing source database
2) It is used for analysis usually for OLAP where huge amounts of data occur frequently.
5) Explain about the integrated data ware house stage?
At this stage data ware house gets updated every time a transaction occurs. The transactions performed during this time are passed back to the operational systems which records the transactions.
6)These are some of the questions make sure that you learn many more questions

Comments

Popular posts from this blog

JAVA Scrollbar, MenuItem and Menu, PopupMenu

ava AWT Scrollbar The  object  of Scrollbar class is used to add horizontal and vertical scrollbar. Scrollbar is a  GUI  component allows us to see invisible number of rows and columns. AWT Scrollbar class declaration public   class  Scrollbar  extends  Component  implements  Adjustable, Accessible   Java AWT Scrollbar Example import  java.awt.*;   class  ScrollbarExample{   ScrollbarExample(){               Frame f=  new  Frame( "Scrollbar Example" );               Scrollbar s= new  Scrollbar();               s.setBounds( 100 , 100 ,  50 , 100 );               f.add(s);               f.setSize( 400 , 400 );               f.setLayout( null );               f.setVisible( true );   }   public   static   void  main(String args[]){           new  ScrollbarExample();   }   }   Output: Java AWT Scrollbar Example with AdjustmentListener import  java.awt.*;   import  java.awt.event.*;   class  ScrollbarExample{        ScrollbarExample(){               Frame f=  new  Frame( "Scro

Difference between net platform and dot net framework...

Difference between net platform and dot net framework... .net platform supports programming languages that are .net compatible. It is the platform using which we can build and develop the applications. .net framework is the engine inside the .net platform which actually compiles and produces the executable code. .net framework contains CLR(Common Language Runtime) and FCL(Framework Class Library) using which it produces the platform independent codes. What is the .NET Framework? The Microsoft .NET Framework is a platform for building, deploying, and running Web Services and applications. It provides a highly productive, standards-based, multi-language environment for integrating existing investments with next-generation applications and services as well as the agility to solve the challenges of deployment and operation of Internet-scale applications. The .NET Framework consists of three main parts: the common language runtime, a hierarchical set of unified class librari

Standard and Formatted Input / Output in C++

The C++ standard libraries provide an extensive set of input/output capabilities which we will see in subsequent chapters. This chapter will discuss very basic and most common I/O operations required for C++ programming. C++ I/O occurs in streams, which are sequences of bytes. If bytes flow from a device like a keyboard, a disk drive, or a network connection etc. to main memory, this is called   input operation   and if bytes flow from main memory to a device like a display screen, a printer, a disk drive, or a network connection, etc., this is called   output operation . Standard Input and Output in C++ is done through the use of  streams . Streams are generic places to send or receive data. In C++, I/O is done through classes and objects defined in the header file  <iostream> .  iostream  stands for standard input-output stream. This header file contains definitions to objects like  cin ,  cout , etc. /O Library Header Files There are following header files important to C++ pro