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Full file at caite.info -Managementth-Edition-Coronel-Test-Bank CHAPTER 2: DATA MODELS 1. Database Systems: Design, Implementation, and Management (The Wadsworth Series in Management Information Systems) · Read more. Database Systems: Design, Implementation, and Management, Eighth Edition by Peter Rob Chapter Distributed Database Management Systems. Chapter Students can view a PDF file of the glossary from the book.
Submit Search. Hardware independence means that the model does not depend on the hardware used in the implementation of the model. They do not support very large amounts of than performance. M relationships, where each record can have more than one parent. They can serve as a communication tool between the users and designers. Although end users are crucial contributors to the development of business rules, it pays to verify end-user perceptions.
In an SQL-based relational database, each table is dependent on every other table. In an SQL-based relational database, rows in different tables are related based on common values in common attributes. Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
N relationships are not appropriate in a relational model. In Chen notation, entities and relationships have to be oriented horizontally; not vertically.
Data Models The network model has structural level dependence. Degrees of Data Abstraction The hierarchical model is software-independent. The relational model is hardware-dependent and software-independent. Data Modeling and Data Models A n is anything about which data are to be collected and stored. Data Model Basic Building Blocks A n represents a particular type of object in the real world. A n is the equivalent of a field in a file system. A n is bidirectional. A n is a restriction placed on the data.
Attributes b. Entities c. Relationships d.
Students and classes have a relationship. Which of the following is true of business rules?
They allow the designer to set company policies with regard to data. They allow the designer to develop business processes. They can serve as a communication tool between the users and designers. A noun in a business rule translates to a n in the data model. A verb associating two nouns in a business rule translates to a n in the data model. In the model, the basic logical structure is represented as an upside-down tree.
In the model, each parent can have many children, but each child has only one parent. The hierarchical data model was developed in the. In the model, the user perceives the database as a collection of records in 1: M relationships, where each record can have more than one parent. The object-oriented data model was developed in the a. Oracle 11g is an example of the.
MySQL is an example of the. The Evolution of Data Models Relationship. A n enables a database administrator to describe schema components. The relational data model was developed in the. The model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.
The model uses the term connectivity to label the relationship types. The data model is said to be a semantic data model. The data model uses the concept of inheritance. Which of the following types of HDFS nodes stores all the metadata about a file system?
Data node b. Client node c. Name node d. Which of the following is true of NoSQL databases? They do not support distributed database architectures. They are not based on the relational model. They are geared toward transaction consistency rather d.
They do not support very large amounts of than performance.
NoSQL databases: Which of the following is a disadvantage of the hierarchical data model? It does not promote data sharing. It is not efficient with 1: M relationships.
It does not promote data integrity. It does not have standards. One of the limitations of the model is that there is a lack of standards. An internal refers to a specific representation of an internal model, using the database constructs supported by the chosen database. A n is a relatively simple representation of more complex real-world data structures.
A n is a brief, precise, and unambiguous description of a policy, procedure, or principle within a specific organization. A n in a hierarchical model is the equivalent of a record in a file system. A n is the conceptual organization of an entire database as viewed by a database administrator.
A n defines the environment in which data can be managed and is used to work with the data in the database. Each row in a relation is called a n. Each column in a relation represents a n. Each row in the relational table is known as a n. A n is a collection of similar objects with a shared structure and behavior. The term is used to refer to the task of creating a conceptual data model that could be implemented in any DBMS.
What components should an implementation-ready data model contain?
An implementation-ready data model should contain at least the following components: A description of the data structure that will store the end-user data. A set of enforceable rules to guarantee the integrity of the data. Show related SlideShares at end. WordPress Shortcode. Published in: Full Name Comment goes here.
Are you sure you want to Yes No. Be the first to like this. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Book details Author: Carlos Coronel Pages: Cengage Learning Language: English ISBN If you want to download this book, click link in the last page 5. Download Free Database Systems: You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips.
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