Which of the following tasks is not required in transforming an ER model into a dimensional model (Star Schema)? 1. Identifying the attributes of the dimension tables. 2. Collapse hierarchies into component entities. 3. Identifying the business events from the ER models. 4. Normalizing dimension model to eliminate the problem of data redundancy and anomalies.
Question
Which of the following tasks is not required in transforming an ER model into a dimensional model (Star Schema)? 1. Identifying the attributes of the dimension tables. 2. Collapse hierarchies into component entities. 3. Identifying the business events from the ER models. 4. Normalizing dimension model to eliminate the problem of data redundancy and anomalies.
Solution
The task that is not required in transforming an ER model into a dimensional model (Star Schema) is "Normalizing dimension model to eliminate the problem of data redundancy and anomalies."
This is because, in a dimensional model (Star Schema), denormalization is often used instead of normalization. Denormalization is a strategy used on a previously-normalized database to increase performance. In computing, denormalization is the process of trying to improve the read performance of a database, at the expense of losing some write performance, by adding redundant copies of data or by grouping data.
In contrast, normalization is a method for organizing data elements in a database into tables. Normalization reduces data redundancy and inconsistencies by ensuring that each data element is stored in only one place. However, this is not a requirement when transforming an ER model into a Star Schema.
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The need for ER modeling?
Which of the following should we always do when preparing to map an ER diagram to relations?Select one:a.Normalize the ERD until no more normalization can be doneb.Check that the DBMS can interpret the constraints in the ERDc.Make sure that we have simplified the ERD as much as possibled.Make sure that our ERD has only one entity and one relationship
The ER Model includes additional concepts like ________.
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