Database Modeling Quiz
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Questions and Answers

Which of the following is the correct way to name a relation in the context model?

  • The relation must be in lowercase and singular
  • The relation must be in capital and singular (correct)
  • The relation must be in lowercase and plural
  • The relation must be in capital and plural

    • What type of relationship is allowed in the context model?

  • Both 1:1 and 1:N relationships
  • 1:1 relationship
  • 1:N relationship
  • M:N relationship (correct)

    • What additional information is included in the fully attributed model compared to the context model?

  • Cardinalities only
  • Attributes only
  • Attributes and cardinalities
  • Both attributes and resolved M:N relationships (correct)

    • What data type is used to store a gender value of 'M' or 'F' in the physical model?

    <p>CHAR(3)</p> Signup and view all the answers

    Which of the following is not a step in the System Development Life Cycle (SDLC)?

    <p>Deployment</p> Signup and view all the answers

    What is the primary focus of logical design in the context of database management systems?

    <p>Translating conceptual design into internal model</p> Signup and view all the answers

    Which phase of the database management process involves creating special storage-related constructs to house end-user tables?

    <p>Implementation</p> Signup and view all the answers

    What is a key aspect of physical design in databases that becomes more complex when data are distributed at different locations?

    <p>Selecting data storage and access characteristics</p> Signup and view all the answers

    During the testing and evaluation phase of database management, what is done in parallel with applications programming?

    <p>Prototyping applications using database tools</p> Signup and view all the answers

    In the context of system evolution, what is a crucial aspect of the operational and maintenance phase?

    <p>Periodic system-usage summaries</p> Signup and view all the answers

    Study Notes

    Context Model

    • A context model must have a singular and capitalized relation name.
    • Relationships (cardinalities) and messages including the relationship are included.
    • Many-to-Many (M:N) relationships are allowed in a context model.

    Fully Attribute Model

    • A fully attribute model includes everything mentioned in the context model and attributes.
    • M:N relationships are resolved in a fully attribute model.

    Physical Model

    • The physical model is an exact implementation plan, including data type and data size.
    • It depends on the DBMS (Database Management System) relation.
    • VARCHAR2 (30) is similar to a String, but reserves a fixed number of blocks.
    • Char(3) is used for characters like gender (M/F) and reserves a fixed number of blocks.
    • Number(precision, scale) has a total number of digits (precision) and digits after the decimal (scale).
    • Date includes all date formats.

    System Development Life Cycle (SDLC)

    • SDLC involves 6 stages: Planning, Analysis, Detailed System Design, Testing and Evaluation, Implementation, and Maintenance.

    Planning

    • Gathering information, research, brainstorming, surveys, etc. are involved in the planning stage.

    Analysis

    • Analyzing the situation, defining problems and constraints, objectives, and scope and boundaries are part of the analysis stage.

    Database Design

    • Database design involves identifying characteristics required and has two views: business view and designer view.

    Conceptual Design

    • Conceptual design must embody a clear understanding of the business and its functional areas.
    • It ensures that all necessary data is included and unnecessary data is excluded.

    Logical Design

    • Logical design is critical to the information system's smooth operation and involves translating the conceptual design into an internal model for a selected DBMS.
    • Advantages and disadvantages are carefully studied in logical design.

    Physical Design

    • Physical design involves selecting data storage and data access characteristics of the database.
    • It depends on device types, data access methods, and DBMS.

    Implementation

    • Implementation involves creating special storage-related constructs to house end-user tables.

    Testing and Evaluation

    • Testing and evaluation involve loading data into the database, testing, and fine-tuning for performance, integrity, concurrent access, and security constraints.

    Operation and Maintenance

    • Operation and maintenance involve periodic maintenance, access permission assignment, and security audits.

    Design Approaches

    • Top-down design starts from identifying the relation and then the attributes (from big picture to small picture).
    • Bottom-up design starts from attributes to relation (from tiny details to big picture).

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    Quiz Team

    Description

    Test your knowledge on database modeling concepts - from context model to physical model. Identify the naming conventions for relations, cardinalities, and attributes, and understand the resolution of M:N relationships.

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