EE562 Slides and Modified Slides from Database Management Systems R Ramakrishnan 2 Overview of Database Design v Conceptual design: (ER Model is used at this stage ) Top-down approach – What are the entities and relationships in the enterprise? – What information about these entities and relationships
Entity Relationship Diagram also known as ERD ER Diagram or ER model is a type of structural diagram for use in database design An ERD contains different symbols and connectors that visualize two important information: The major entities within the system scope and
Logical Database Design • Based upon the conceptual data model • Four key steps 1 Develop a logical data model for each known user interface for the application using normalization principles 2 Combine normalized data requirements from all user interfaces into one consolidated logical database model (view integration) 3
Using High-Level Conceptual Data Models (cont'd ) Logical design or data model mapping Result is a database schema in implementation data model of DBMS Physical design phase Internal storage structures file organizations indexes access paths and physical design parameters for the database
Database Design The requirements gathering and specification provides you with a high-level understanding of the organization its data and the processes that you must model in the database Database design involves constructing a suitable model of this information Since the design process is complicated especially for large databases database
The Entity-Relationship Model Chapter 2 Database Management Systems 3ed R Ramakrishnan and J Gehrke 2 Overview of Database Design Conceptual design: (ER Model is used at this stage ) What are the entities and relationships in the enterprise? An employee can work in many departments a dept can have many employees
10/2/2019#2) Initiating Conceptual Design: After the requirements are collected a creation of conceptual schema for the database takes place the result of which is an ERD i e Entity-Relationship Diagram or UML Class Diagram #3) Initiating Logical Design: Here designing of relational schemas takes place This simply means that the concept of primary
Comp 521 – Files and Databases Fall 2012 2 Overview of Database Design Conceptual design: (ER Model is used at this stage ) What are the entities and relationships in the enterprise? What information about these entities and relationships should we store in the database?
relational paradigms We regard the problems of using UML class diagrams for relational database design as a conceptual impedance mismatch as the Entity Relationship model does not have the structures in the model to deal with Object Oriented concepts Keywords: EERD UML Class Diagram Relational Database Design Structural Constraints relational
ER Model Concepts Entities and Attributes Entity is a basic concept for the ER model Entities are specific things or objects in the mini-world that are represented in the database For example the EMPLOYEE John Smith the Research DEPARTMENT the ProductX PROJECT Attributes are
The Entity-Relationship (ER) Model (Study Cow book Chapter 2) Comp 521 – Files and Databases Fall 2012 2 Overview of Database Design Conceptual design: (ER Model is used at this stage ) What are the entities and An employee can work in many departments
3 Designing a database 1 Requirements analysis What does the user want from the database? 2 Conceptual Database design High-level semantic design e g using ER Model In sufficient detail to be converted into a data model 3 Logical Database design Convert conceptual design into a database schema in the data model of the chosen DBMS e g relational data model
Major Steps in Database Design Requirements Analysis: Talk to the potential users! Understand what data is to be stored and what operations and requirements are desired Conceptual Database Design: Develop a high-level description of the data and constraints (we will use the ER data model) Logical Database Design: Convert the conceptual model to a schema in the chosen data model of the DBMS
Comp 521 – Files and Databases Fall 2014 2 Overview of Database Design ! Conceptual design: (ER Model is used at this stage ) What are the entities and relationships of the enterprise? What information about these entities and relationships should we store in the database?
The second reason might be that the subclass participate in a relationship that is different than the employee also So that's also another reason So far we talked about conceptual design We talked about that ER model and we've seen how this is actually the most popular way for conceptual database design
I know the difference between a Conceptual Data Model and a Logical Data Model but what is the difference between a Conceptual Data Model and an ER diagram? They look extremely similar! Is there any Browse other questions tagged database-design or ask your own question
Understanding of proper database design from conceptual to physical schema ER modeling as a helpful tool in database design Schema transformation and normalization as blueprint for good designs Entity-Relationship (ER) Model and Diagrams Employee dep Dependent 1 19
LECTURE OUTLINE Using High-Level Conceptual Data Models for Database Design Entity-Relationship (ER) model •Popular high-level conceptual data model ER diagrams •Diagrammatic notation associated with the ER model
Conceptual Design using the Entity Relationship (ER) Mode l Juliana Freire Some slides adapted from L Delcambre R Ramakrishnan and Silberschatz Korth and Sudarshan CS5530/6530 2! Juliana Freire Overview of Database Design • Conceptual design: – Analyze 'problem' define which information the database
Comp 521 – Files and Databases Fall 2014 2 Overview of Database Design ! Conceptual design: (ER Model is used at this stage ) What are the entities and relationships of the enterprise? What information about these entities and relationships should we store in the database?
{Conceptual design with ER model Chapter 2 CMPT 354 •2004-2 3 Overview of Database Design {Database design process can be divided into six steps zRequirement analysis zConceptual database design (ER model is used in this step) zLogical database design zSchema refinement zPhysical database design zApplication and security design
2 Logical database design 2 1 ER modeling (conceptual design) 2 2 View integration of multiple ER models 2 3 Transformation of the ER model to SQL tables 2 4 Normalization of SQL tables (up to 3NF or BCNF) *result: global database schema transformed to table definitions 3 Physical database design * index selection (access methods
used for the description of theconceptual schemaof the database not used for database implementation formal notation close to natural language Can be mapped to various data models relational object-oriented object-relational XML Jan Chomicki Conceptual database design 3 / 22 Basic ER model concepts Schema level Instance level Domain Domain
A general understanding to the three models is that business analyst uses conceptual and logical model for modeling the data required and produced by system from a business angle while database designer refines the early design to produce the physical model for presenting physical database structure ready for database construction
3 Designing a database 1 Requirements analysis What does the user want from the database? 2 Conceptual Database design High-level semantic design e g using ER Model In sufficient detail to be converted into a data model 3 Logical Database design Convert conceptual design into a database schema in the data model of the chosen DBMS e g relational data model
used for the description of theconceptual schemaof the database not used for database implementation formal notation close to natural language Can be mapped to various data models relational object-oriented object-relational XML Jan Chomicki Conceptual database design 3 / 22 Basic ER model concepts Schema level Instance level Domain Domain
Database Design The requirements gathering and specification provides you with a high-level understanding of the organization its data and the processes that you must model in the database Database design involves constructing a suitable model of this information Since the design process is complicated especially for large databases database
Database Management Systems R Ramakrishnan and J Gehrke 16 Summary of Conceptual Design Conceptual design follows requirements analysis – Yields a high-level description of data to be stored ER model popular for conceptual design – Constructs are expressive close to the way people think about their applications
EE562 Slides and Modified Slides from Database Management Systems R Ramakrishnan 2 Overview of Database Design v Conceptual design: (ER Model is used at this stage ) Top-down approach – What are the entities and relationships in the enterprise? – What information about these entities and relationships
LECTURE OUTLINE Using High-Level Conceptual Data Models for Database Design Entity-Relationship (ER) model •Popular high-level conceptual data model ER diagrams •Diagrammatic notation associated with the ER model
• Entity-Relationship model is used in the conceptual design of adatabase(+ conceptual level conceptual schema) An employee can work in many departments ( 0) basis for deriving a relational database schema from an ER diagram 2 Entity-Relationship Model
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