A good understanding of Hadoop Architecture is required to understand and leverage the power of Hadoop. Here are few important practical questions which can be asked to a Senior Experienced Hadoop Developer in an interview. This list primarily includes questions related to Hadoop Architecture, MapReduce, Hadoop API and Hadoop Distributed File System (HDFS).
Showing posts with label DWH. Show all posts
Showing posts with label DWH. Show all posts
Saturday, May 4, 2013
Sunday, April 28, 2013
Seven Principles for Enterprise Data Warehouse Design
In previous columns, I've talked about how you can improve the likelihood of achieving your desired results in building a data management center of excellence and in managing enterprise information. This month, I'd like to narrow the focus to one particular aspect of the enterprise information management spectrum: data warehouse (DW) design.
Contrary to popular sentiment, data warehousing is not a moribund technology; it's alive and kicking. Indeed, most companies deploy data warehousing technology to some extent, and many have an enterprise-wide DW.
Tuesday, April 23, 2013
Sunday, April 21, 2013
DWH Concepts and Fundamentals
Data Warehouse
As per Bill Inmon "A warehouse is a Historical, subject-oriented, integrated, time-variant and non-volatilecollection of data in support of management's decision making process".
By Historical we mean, the data is continuously collected from sources and loaded in the warehouse. The previously loaded data is not deleted for long period of time. This results in building historical data in the warehouse.By Subject Oriented we mean data grouped into a particular business area instead of the business as a whole.By Integrated we mean, collecting and merging data from various sources. These sources could be disparate in nature.By Time-variant we mean that all data in the data warehouse is identified with a particular time period.By Non-volatile we mean, data that is loaded in the warehouse is based on business transactions in the past, hence it is not expected to change over time.
Data WareHousing Websites
| Ralph Kimball Associates | Ralph Kimball Associates focuses on developing, teaching, and delivering dimensional data warehouse design techniques for the community of IT professionals. |
|---|---|
| The OLAP Report | The OLAP Report website is a vendor-independent, research-based source of information regarding analytical processing of information. It provides detailed, unbiased and regularly updated information on the OLAP market and OLAP products. |
| The Data Warehousing Institute | The Data Warehouse Institute (TDWI) is the premier provider of in-depth, high quality education and training in the data warehousing and business intelligence industry. |
| DM Review | The DM Review website is an excellent data warehousing resource focused on business intelligence. |
| Business Intelligence Network | The B-EYE-Network serves the business intelligence and data warehousing community with unparalleled industry coverage and resources. In response to the growing need for a more sophisticated online resource, the B-EYE-Network delivers industry based content hosted by domain experts and includes horizontal technology coverage from the most respected thought leaders in the BI and DW industry. |
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