CoolInterview.com - World's Largest Collection of Interview Questions
Interview Success Kit - 9,000 Interview Que. & Ans.
Covers 9,000+ Interview Questions asked in actual MNC Interviews - all with model answers.
Start Your Own website Now
Sponsored Links

Interview Questions
Our Services


Advertisements Data Warehousing Interview Questions
COOLINTERVIEW.COM DATA WAREHOUSING INTERVIEW QUESTIONS QUESTIONS LISTING

Data Warehousing Interview Questions & Answers

Below we have listed all the Data Warehousing Interview Questions and answers. Feel free to comment on any Data Warehousing Interview Questions or answer by the comment feature available on the page.

To buy an eBook containing 9000 Interview Questions, with Answers, Click Here.

Subcategories for Data Warehousing Interview Questions - The following are sub categories for which Interview Questions are available under this category. Please select the appropriate sub-category:

Abinitio Interview Questions (108)

Analysis services Interview Questions (22)

BO Designer Interview Questions (72)

Business Intelligence Interview Questions (36)

Business Objects Interview Questions (80)

Cognos Interview Questions (54)

Cold Fusion Interview Questions (20)

Data Mart Interview Questions (12)

Data Warehousing Basics Interview Questions (40)

Data Warehousing Concepts Interview Questions (16)

DataStage Interview Questions (178)

Enterprise Data Warehouse Interview Questions (13)

ETL Interview Questions (49)

General Datawarehousing Interview Questions (50)

Informatica Interview Questions (417)

MicroStrategy Interview Questions (10)

Operational data store Interview Questions (11)

Reportnet Interview Questions (34)

1 2 3 4 5 6 7 8 Next

Sort By :   Latest First  |  Oldest First  |  By Rating

Question
Rating
View Answer
What are the major differences between Informatica 7.1,8.1,8.5 and 8.6?
View Answer
What is difference between stored procedure transformation and external procedure transformation?
View Answer
Which is better among connected lookup and unconnected lookup transformations in informatica or any other ETL tool?
View Answer
What is junk dimension? What are junk dimension and degenerated dimension?
View Answer
In Dimensional modeling fact table is normalized or denormalized?in case of star schema and incase of snow flake schema?
View Answer
What is the use of bridge table. Can give a simple example?
View Answer
What is the approximate size of a data warehouse?
View Answer
I wanted to load only particular no of records suppose i have 100 records out of which i wanted to load first 10 records to target.
View Answer
what is project architecture in datastage
View Answer
What is surrogate key?
View Answer
What is ER Diagram?
View Answer
What is meta data?
View Answer
How Do I Make Remarks In My Code?
View Answer
SQL SERVER ? Data Warehousing Interview Questions and Answers ? Part 3 July 28, 2007 by pinaldave What are slowly changing dimensions (SCD)? SCD is abbreviation of Slowly changing dimensions. SCD applies to cases where the attribute for a record varies over time. There are three different types of SCD. 1) SCD1 : The new record replaces the original record. Only one record exist in database ? current data. 2) SCD2 : A new record is added into the customer dimension table. Two records exist in database ? current data and previous history data. 3) SCD3 : The original data is modified to include new data. One record exist in database ? new information are attached with old information in same row. What is hybrid slowly changing dimension? Hybrid SCDs are combination of both SCD 1 and SCD 2. It may happen that in a table, some columns are important and we need to track changes for them i.e capture the historical data for them whereas in some columns even if the data changes, we don?t care. What is BUS Schema? BUS Schema is composed of a master suite of confirmed dimension and standardized definition if facts. What is a Star Schema? Star schema is a type of organizing the tables such that we can retrieve the result from the database quickly in the warehouse environment. What Snow Flake Schema? Snowflake Schema, each dimension has a primary dimension table, to which one or more additional dimensions can join. The primary dimension table is the only table that can join to the fact table. Differences between star and snowflake schema? Star schema ? A single fact table with N number of Dimension, all dimensions will be linked directly with a fact table. This schema is de-normalized and results in simple join and less complex query as well as faster results. Snow schema ? Any dimensions with extended dimensions are know as snowflake schema, dimensions maybe interlinked or may have one to many relationship with other tables. This schema is normalized and results in complex join and very complex query as well as slower results. What is Difference between ER Modeling and Dimensional Modeling? ER modeling is used for normalizing the OLTP database design. Dimensional modeling is used for de-normalizing the ROLAP/MOLAP design. What is degenerate dimension table? If a table contains the values, which are neither dimension nor measures is called degenerate dimensions. Why is Data Modeling Important? Data modeling is probably the most labor intensive and time consuming part of the development process. The goal of the data model is to make sure that the all data objects required by the database are completely and accurately represented. Because the data model uses easily understood notations and natural language , it can be reviewed and verified as correct by the end-users. In computer science, data modeling is the process of creating a data model by applying a data model theory to create a data model instance. A data model theory is a formal data model description. When data modelling, we are structuring and organizing data. These data structures are then typically implemented in a database management system. In addition to defining and organizing the data, data modeling will impose (implicitly or explicitly) constraints or limitations on the data placed within the structure. Managing large quantities of structured and unstructured data is a primary function of information systems. Data models describe structured data for storage in data management systems such as relational databases. They typically do not describe unstructured data, such as word processing documents, email messages, pictures, digital audio, and video. (Reference : Wikipedia) What is surrogate key? Surrogate key is a substitution for the natural primary key. It is just a unique identifier or number for each row that can be used for the primary key to the table. The only requirement for a surrogate primary key is that it is unique for each row in the table. It is useful because the natural primary key can change and this makes updates more difficult.Surrogated keys are always integer or numeric. What is Data Mart? A data mart (DM) is a specialized version of a data warehouse (DW). Like data warehouses, data marts contain a snapshot of operational data that helps business people to strategize based on analyses of past trends and experiences. The key difference is that the creation of a data mart is predicated on a specific, predefined need for a certain grouping and configuration of select data. A data mart configuration emphasizes easy access to relevant information (Reference : Wiki). Data Marts are designed to help manager make strategic decisions about their business. What is the difference between OLAP and data warehouse? Datawarehouse is the place where the data is stored for analyzing where as OLAP is the process of analyzing the data,managing aggregations, partitioning information into cubes for in depth visualization. What is a Cube and Linked Cube with reference to data warehouse? Cubes are logical representation of multidimensional data.The edge of the cube contains dimension members and the body of the cube contains data values. The linking in cube ensures that the data in the cubes remain consistent. What is junk dimension?
View Answer
What is snapshot with reference to data warehouse?
View Answer
What is the difference between data warehousing and business intelligence?
View Answer
What is hybrid slowly changing dimension?
View Answer
What is BUS Schema?
View Answer
Can u copy the session to a different folder or repository?
View Answer
State some of the benefits of dataware housing?
View Answer

1 2 3 4 5 6 7 8 Next

A D V E R T I S E M E N T



User Options
Sponsored Links


Copyright ©2003-2016 CoolInterview.com, All Rights Reserved.
Privacy Policy | Terms and Conditions

Download Yahoo Messenger | Placement Papers| FREE SMS | ASP .Net Tutorial | Web Hosting | Dedicated Servers | C Interview Questions & Answers

Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes


Cache = 0.015625 Seconds