C. Fact constellation. Alternatives to star schemas at the top level include a variation, which is a snowflake schema. A. 28. DBMS Objective type Questions and Answers. Question 4 Dimensionality refers to Select one: Cardinality of key values in a star schema, The data that describes the transactions in the fact table The level of detail of data that is held in the fact table, The level of detail of data that is held in the dimension table Feedback Your answer is correct. It takes less time for the execution of queries. Fact constellation is a good alternative to the: a. Galaxy Schema: b. Snowflake schema: c. Star Schema: d. None of the above: View Answer Report Discuss Too Difficult! Star Schema, as the name suggests, it can appears to be in star shape with single fact table in the middle and a set of dimension tables connected to it. A directory of Objective Type Questions covering all the Computer Science subjects. Much like a database, a data warehouse also requires to maintain a schema. This snowflake schema stores exactly the same data as the star schema. The “Fact Constellation” Schema The “Fact Constellation” Schema Another Alternative to “Level” Fact Constellation is a good alternative to the Star, but when dimensions have very high cardinality, the sub-selects in the dimension tables can be a source of delay. For each star schema it is possible to construct fact constellation schema(for example by splitting the original star schema into more star schemes each of them describes facts on … C. Fact constellation. 71) Data warehouse architecture is based on. Pages 323. Star schema is a mature modeling approach widely adopted by relational data warehouses. It is structured like a star in shape of appearance. sales or support calls is surrounded and linked with other tables holding the dimensions of the fact table. When a star schema has many dimension tables, data engineers might refer to it as a centipede schema. A) Star schema B) Snowflake schema C) Fact constellation D) Star-snowflake schema Star schema. Regardless of which Data Binding tool chosen, it is recommended that validation against the XML Schema be undertaken. Data mining and data warehousing The full form of OLAP is A)Online Analytical Processing B) Online Advanced Processing C) Online Advanced Preparation D) Online Analytical Performance 2. 1 dimension with 20 attributes is good, 20 dimensions with 1 attribute each is not so good. is a good alternative to the star schema A Star schema B Snowflake schema C. Is a good alternative to the star schema a star. _____ is a good alternative to the star schema. *XMLBeans from Apache is another good alternative and has very good XML Schema support. There is a variety of ways of arranging schema objects in the schema models designed for data warehousing. Star Schema. The biggest drawback of the level indicator in the classic star schema is that is limits ..... A) flexibility B) quantify C) qualify D) ability. Fact constellation is a good alternative to the Galaxy Schema Snowflake schema Star Schema None of the above. It is also known as Star Join Schema and is optimized for querying large data sets. In star schema, Normalization is not used. C. Fact constellation. RE: Alternative Type 2 Slowly Changing Dimension (Star Schema) johnherman (MIS) 8 Jun 04 16:27 I think you actually have a single dimension with a hierarchy if you want to treat it that way, since the type 2 records are "children" of the type 1. Most business intelligence data warehouses use what is called a dimensional model, where a basic fact table of data e.g. Think about it – if you just kept all your data in a normalized schema, you could logically recreate a star schema dimension table by placing a view over a set of its tables. consists of a large set of facts and a number of dimensions. The most important difference is that the dimension tables in the snowflake schema are normalized. is a good alternative to the star schema A Star schema B Snowflake schema C. is a good alternative to the star schema. The correct answer is: Segmentation Question 3 ___________ is a good alternative to the star schema. A directory of Objective Type Questions covering all the Computer Science subjects. The correct answer is: Fact constellation. Star Schema, as the name suggests, it can appears to be in star shape with single fact table in the middle and a set of dimension tables connected to it. The correct, answer is: The data that describes the transactions in the fact table Question 5 A star schema has what type of, relationship from a dimension to the fact table? The third differentiator in this Star schema vs Snowflake schema face-off is the performance of these models. Search Google: Answer: (c). Feedback Your answer is correct. supports basic OLAP operations, including slice and dice, 73) The core of the multidimensional model is the. A Star Schema. Tagged With: Tagged With: Data Warehouse MCQ Questions and Answers pdf, data warehousing mcq, dwh mcq, expansion for dss in dw is, is a good alternative to the star schema., mcq on data warehouse, wase dumps, wase mcq, wase question and answer, wase solution, wase solutions, wase wipro, wipro wase B. Snowflake schema. A. Star schema. C. flexibility. What is the Star Schema for Data Warehouse Design. Looking at the pharmaceutical sales example, facts are measurable data about the event. 3. The star schema is less complex to understand and tends to involve fewer joins than other data warehouse schemas, which makes it optimized for querying large data sets. A) Star schema B) Snowflake schema C) Fact constellation D) Star-snowflake schema. The Star Schema Star schemas are organized into fact and dimension tables. Which of the following applied on warehouse? ..... is a subject-oriented, integrated, time-variant, nonvolatile collection or data in support of management decisions. A. The fact table has the same dimensions as it does in the star schema example. Each dimension in a star schema is represented with only one-dimension table. The correct answer is: Decision, Support system Question 7 A data warehouse is described by which of the following? c. 6. 74) The data from the operational environment enter, 76) Business Intelligence and data warehousing is used for, data that is never found in the operational, are responsible for running queries and reports against data. The correct answer is: Segmentation Question 3 _____ is a good alternative to the star schema. Star Schema. A. quantify. While it uses less space. Yahoo’s data and business intelligence architect, Rohit Chatter, answers the latest debate, Star versus Snowflake schema, by breaking down the differences, one aspect at a time. B. Snowflake schema. Star schema uses more space. A Star Schema is a schema Architectural structure used for creation and implementation of the Data Warehouse systems, where there is only one fact table and multiple dimension tables connected to it. Star schema is easy to operate as compared to fact constellation schema as it has less number of joins between the tables. You can have many different dimensions but as you get near 20 or 30 total, you almost definitely have better modeling options at the source level. Star schemas are the simplest and most popular way of organizing information within a data warehouse. Star schema. Along the same lines the Star schema uses less foreign keys so the query execution time is limited. This preview shows page 129 - 132 out of 323 pages. 5. Which operation mainly used to access the live data online and analyse it a. ROLAP b. OLAP c. MOLAP d. 28. C. Fact constellation. The correct answer is Segmentation Question 3 is a good alternative to the star. This preview shows page 60 - 62 out of 323 pages. 5. In the case of query performance, if you’ve got your star schema loaded on a database like SQL Server, a well-designed star schema will provide a very good query performance. However, you would lose the performance benefits of doing that view’s joins in advance, like a true star schema … consistency Segmentation Disambiguation Feedback Your answer is correct. In almost all cases the data retrieval speed of a Star schema has the Snowflake beat. A database uses relational model, while a data warehouse uses Star, Snowflake, and Fact Constellation schema. The biggest drawback of the level indicator in the classic star schema is that is limits ..... A) flexibility B) quantify C) qualify D) ability. San Francisco State University • COMPUTER 993, San Francisco State University • COMPUTER 1120, San Francisco State University • COMPUTER 210, San Francisco State University • COMPUTER 1, Khan Academy Behavioral Review Only__P_S 6A_ Sensing the Environment.txt, Pir mehr Ali Shah Arid Agriculture University, Rawalpindi, Pir mehr Ali Shah Arid Agriculture University, Rawalpindi • IT CS600, University of North Texas, Dallas • COMPUTER MISC, Vellore Institute of Technology • CSE 101. The Star Schema Star schemas are organized into fact and dimension tables. D. Star-snowflake schema. b) read only. Feedback Your answer is correct. D. Star-snowflake schema. Self-service BI tools use a different technology than … A) Data Mining B) Data Warehousing C) Document Mining D) Text Mining 3. The correct answer is: Segmentation Question 3 _____ is a good alternative to the star schema. C. Fact constellation. However, alternatives to the star schema, such as snowflake schemas and galaxy schemas, exist for users who will get more benefits from modeling their data warehouse in a … The correct answer is: Data, Mining Question 6 Expansion for DSS in DW is Select one: Decisive Strategic System Data Support System, Data Store System Decision Support system Feedback Your answer is correct. Which operation mainly used to access the live data online and analyse it: a. Course Hero is not sponsored or endorsed by any college or university. B. qualify. Dimension tables describe business entities—the things you model. This is a really broad question but the short answer is that generally, too many dimensions is bad. This preview shows page 129 - 132 out of 323 pages. …………………… is a good alternative to the star schema. DBMS Objective type Questions and Answers. A star schema depicts each dimension with only one-dimension table. It requires modelers to classify their model tables as either dimension or fact. Select one: Can be, updated by end users Contains only current data Contains numerous naming conventions and formats Organized, around important subject areas Feedback Your answer is correct. Interestingly, the process of normalizing dimension tables is called snowflaking. OLAP-Style Analysis With Self-Service Tools. In computing, the star schema is the simplest style of mart schema and is the approach most widely used to develop data warehouses and interdimensional data marts. 70) Which of the following is not a kind of data warehouse application? ANSWER: C 29. The Star Schema data model is the simplest type of Data Warehouse schema. Denormalization of Data in Star Schemas The star schema’s goal is to speed up read queries and analysis for massive amounts of data contained in … 22. The Star Schema data model is the simplest type of Data Warehouse schema. Star schema is a mature modeling approach widely adopted by relational data warehouses. D. Star-snowflake schema. Star schema. Dimension tables describe business entities—the things you model. The Star schema is in a more de-normalized form and hence tends to be better for performance. A schema is a collection of database objects, including tables, views, indexes, and synonyms. 69) Which of the following is not a component of a data warehouse? Course Hero is not sponsored or endorsed by any college or university. One data warehouse schema model is a star schema. The star schema consists of one or more fact tables referencing any number of dimension tables.The star schema is an important special case of the snowflake schema, and is more effective for handling simpler queries. Get step-by-step explanations, verified by experts. The correct answer is: Decision support Question 10 A data warehouse Select, one: must import data from transactional systems whenever significant changes occur in the transactional data, works on live transactional data to provide up to date and valid results takes regular copies of transaction data, takes preprocessed transaction data and stores in a way that is optimised for analysis Feedback Your answer is, correct. It requires modelers to classify their model tables as either dimension or fact. 4. A. The correct answer is: One-to-many Question 6 __________ predicts, future trends & behaviors, allowing business managers to make knowledge-driven decisions Select one: Meta, data Data mart Data warehouse Data Mining Feedback Your answer is correct. B. qualify. Entities can include products, people, places, and concepts including time itself. Dimensional model, where a basic fact table of data warehouse application schema depicts each dimension in a more form. 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