data warehouse questions and answers pdf

Data Warehouse Questions And Answers Pdf

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Are you preparing for Data Warehousing interview? If yes, go through our interview questions page to win your ideal job. Data Warehousing is the main act of business intelligence and it is used to assess and analyze the data.

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Data Warehousing Interview Questions & Answers

A Datawarehouse is the repository of a data and it is used for Management decision support system. Datawarehouse consists of wide variety of data that has high level of business conditions at a single point in time.

In single sentence, it is repository of integrated information which can be available for queries and analysis. What is Business Intelligence? Business Intelligence is also known as DSS — Decision support system which refers to the technologies, application and practices for the collection, integration and analysis of the business related information or data.

Even, it helps to see the data on the information itself. Dimension table is a table which contain attributes of measurements stored in fact tables. This table consists of hierarchies, categories and logic that can be used to traverse in nodes. Fact table contains the measurement of business processes, and it contains foreign keys for the dimension tables.

Data Mining is set to be a process of analyzing the data in different dimensions or perspectives and summarizing into a useful information.

Can be queried and retrieved the data from database in their own format. OLTP is abbreviated as On-Line Transaction Processing, and it is an application that modifies the data whenever it received and has large number of simultaneous users.

OLAP is abbreviated as Online Analytical Processing, and it is set to be a system which collects, manages, processes multi-dimensional data for analysis and management purposes. ODS is abbreviated as Operational Data Store and it is a repository of real time operational data rather than long term trend data.

A view is nothing but a virtual table which takes the output of the query and it can be used in place of tables. A materialized view is nothing but an indirect access to the table data by storing the results of a query in a separate schema. ETL is a software which is used to reads the data from the specified data source and extracts a desired subset of data. Next, it transform the data using rules and lookup tables and convert it to a desired state.

These are decision support systems which is used to server large number of users. Real-time datawarehousing captures the business data whenever it occurs. When there is business activity gets completed, that data will be available in the flow and become available for use instantly. Aggregate tables are the tables which contain the existing warehouse data which has been grouped to certain level of dimensions.

It is easy to retrieve data from the aggregated tables than the original table which has more number of records. Time dimensions are usually loaded through all possible dates in a year and it can be done through a program.

Here, years can be represented with one row per day. Non-Addictive facts are said to be facts that cannot be summed up for any of the dimensions present in the fact table. If there are changes in the dimensions, same facts can be useful.

A Datamart is a specialized version of Datawarehousing and it contains a snapshot of operational data that helps the business people to decide with the analysis of past trends and experiences.

A data mart helps to emphasizes on easy access to relevant information. An active datawarehouse is a datawarehouse that enables decision makers within a company or organization to manage customer relationships effectively and efficiently. Datawarehouse is a place where the whole data is stored for analyzing, but OLAP is used for analyzing the data, managing aggregations, information partitioning into minor level information. ER diagram is abbreviated as Entity-Relationship diagram which illustrates the interrelationships between the entities in the database.

This diagram shows the structure of each tables and the links between the tables. Foreign keys of dimension tables are primary keys of entity tables. Foreign keys of fact tables are the primary keys of the dimension tables. SCD is defined as slowly changing dimensions, and it applies to the cases where record changes over time. BUS schema consists of suite of confirmed dimension and standardized definition if there is a fact tables.

Star schema is nothing but a type of organizing the tables in such a way that result can be retrieved from the database quickly in the data warehouse environment. Snowflake schema which has primary dimension table to which one or more dimensions can be joined.

The primary dimension table is the only table that can be joined with the fact table. Core dimension is nothing but a Dimension table which is used as dedicated for single fact table or datamart. Name itself implies that it is a self explanatory term. Cleaning of Orphan records, Data breaching business rules, Inconsistent data and missing information in a database.

Metadata is defined as data about the data. The metadata contains information like number of columns used, fix width and limited width, ordering of fields and data types of the fields.

In datawarehousing, loops are existing between the tables. If there is a loop between the tables, then the query generation will take more time and it creates ambiguity. It is advised to avoid loop between the tables. Yes, dimension table can have numeric value as they are the descriptive elements of our business. Cubes are logical representation of multidimensional data.

The edge of the cube has the dimension members,and the body of the cube contains the data values. Dimensional Modeling is a concept which can be used by dataware house designers to build their own datawarehouse. This model can be stored in two types of tables — Facts and Dimension table. Fact table has facts and measurements of the business and dimension table contains the context of measurements. Surrogate key is nothing but a substitute for the natural primary key.

It is set to be a unique identifier for each row that can be used for the primary key to a table. ER modeling will have logical and physical model but Dimensional modeling will have only Physical model. A Partial backup in an operating system is a backup short of full backup and it can be done while the database is opened or shutdown.

The goal to Optimizer is to find the most efficient way to execute the SQL statements. What is the difference between metadata and data dictionary?

But, Data dictionary contain the information about the project information, graphs, abinito commands and server information. Your email address will not be published.

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Database - Data Warehousing

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What is Datawarehousing? A Datawarehouse is the repository of a data and it is used for Management decision support system. What is Business Intelligence? What is Dimension Table? What is Fact Table? What are the stages of Datawarehousing? What is Data Mining? What is OLTP? What is OLAP?

Data Warehouse Interview Questions

Dear readers, these Data Warehousing Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Data Warehousing. A : Data warehouse is a subject oriented, integrated, time-variant, and nonvolatile collection of data that supports management's decision-making process. A : Subject oriented signifies that the data warehouse stores the information around a particular subject such as product, customer, sales, etc. A : Some applications include financial services, banking services, customer goods, retail sectors, controlled manufacturing. A : A data warehouse contains historical information that is made available for analysis of the business whereas an operational database contains current information that is required to run the business.

Data Warehousing - Interview Questions

Software Programming Data Warehousing Mining online test helps you to enhance your learning ability by practice the given tests. Previous year online test Software Programming Data Warehousing Mining are available at free of cost. You have to practice regularly by attempting the various online test Software Programming Data Warehousing Mining question paper available here.

1. What is a data warehouse? List the types of Data warehouse architectures.

 А-а, Росио - прелестное создание. - Мне нужно немедленно ее увидеть. - Но, сеньор, она занята с клиентом. - Это очень важно, - извиняющимся тоном сказал Беккер. Вопрос национальной безопасности. Консьерж покачал головой: - Невозможно.

Возбужденный, Беккер ускорил шаги в поисках телефона. По другой стороне улицы, оставаясь невидимым, шел человек в очках в тонкой металлической оправе. ГЛАВА 27 Тени в зале шифровалки начали удлиняться и терять четкость.

И ради этого он вызвал меня в субботу. - Как сказать… - Она заколебалась.  - Несколько месяцев назад к нам попал перехват КОМИНТ, на расшифровку ушло около часа, но там мы столкнулись с удивительно длинным шифром - что-то около десяти тысяч бит.

ГЛАВА 102 Стратмор спустился на нижний этаж ТРАНСТЕКСТА и ступил с лесов в дюймовый слой воды на полу. Гигантский компьютер содрогался мелкой дрожью, из густого клубящегося тумана падали капли воды. Сигналы тревоги гремели подобно грому. Коммандер посмотрел на вышедший из строя главный генератор, на котором лежал Фил Чатрукьян. Его обгоревшие останки все еще виднелись на ребрах охлаждения.

В чем. - Пусти меня, - сказала Сьюзан, стараясь говорить как можно спокойнее. Внезапно ее охватило ощущение опасности. - Ну, давай же, - настаивал Хейл.

Data Warehousing Interview Questions And Answers Guide

 Мидж, скорее всего это наши данные неточны, - решительно заявил Бринкерхофф.  - Ты только подумай: ТРАНСТЕКСТ бьется над одним-единственным файлом целых восемнадцать часов. Слыханное ли это .

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  1. Rosie B.

    Solved examples with detailed answer description, explanation are given and it would be easy to understand.

    30.05.2021 at 06:06 Reply
  2. Renteuplebec

    Data Warehousing Interview Questions and Answers will guide now that Data warehouse is a repository of an organizations electronically stored data.

    31.05.2021 at 07:17 Reply

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