Architecture of dbms
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The document discusses the three levels of database architecture: external, conceptual, and internal. It describes the external level as the user's view, the conceptual level as the logical structure of the stored data, and the internal level as the physical representation of data storage. It also defines three types of users - administrators, designers, and end users - and explains the concepts of logical and physical data independence.
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Dbms
The document provides information about the CENG 302 Introduction to Database Management Systems course taught by Nihan Kesim Çiçekli including the instructor's contact information, lecture times, course website, textbook references, grading breakdown, policies, and course outline. The course outline covers topics such as the relational data model, SQL, entity-relationship modeling, database design, storage devices, and what a database management system is.
Dbms.ppt
This document provides an introduction to database management systems (DBMS). It defines a DBMS as a systematic way to create, retrieve, update, and manage data. A DBMS allows data like text, numbers, images, videos, and sounds to be collected and stored together as a database. Examples of DBMS applications include telephone systems for contact details, Facebook for user information and connections, online shopping, and supermarket inventory systems. The document also discusses traditional databases, multimedia databases, and geographic information systems.
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DBMS - Database Management System, Data and Database, DBMS meaning, Why DBMS?, Characteristics of DBMS, Types of DBMS- Hierarchical DBMS, Network DBMS, Relational DBMS, Object-oriented DBMS, Applications of DBMS, Popular DBMS Software, Advantages of DBMS, disadvantages of DBMS.
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A database management system (DBMS) is a collection of programs that enables users to create and maintain a database. It stores data in a way that makes it easier to retrieve, manipulate, and generate information. Some key advantages of a DBMS include data independence, efficient data access, data integrity and security, concurrent access and crash recovery. The goal of a DBMS is to provide an environment that is convenient and efficient for retrieving and storing information in the database.
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Dbms
The document provides information about the CENG 302 Introduction to Database Management Systems course taught by Nihan Kesim Çiçekli including the instructor's contact information, lecture times, course website, textbook references, grading breakdown, policies, and course outline. The course outline covers topics such as the relational data model, SQL, entity-relationship modeling, database design, storage devices, and what a database management system is.
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This document provides an introduction to database management systems (DBMS). It defines a DBMS as a systematic way to create, retrieve, update, and manage data. A DBMS allows data like text, numbers, images, videos, and sounds to be collected and stored together as a database. Examples of DBMS applications include telephone systems for contact details, Facebook for user information and connections, online shopping, and supermarket inventory systems. The document also discusses traditional databases, multimedia databases, and geographic information systems.
DBMS - Database Management System
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data abstraction in DBMS
The document discusses the three levels of data abstraction in database management systems: the view level describes different views of data for users, the conceptual level defines how data is structured and related, and the physical level hides where data is actually stored on disk drives and managed by database administrators. Data abstraction involves hiding irrelevant details from users at different levels to provide customized views and achieve data independence between users and the physical storage of information.
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Storage areas
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A database management system (DBMS) is a collection of programs that enables users to create and maintain a database. It stores data in a way that makes it easier to retrieve, manipulate, and generate information. Some key advantages of a DBMS include data independence, efficient data access, data integrity and security, concurrent access and crash recovery. The goal of a DBMS is to provide an environment that is convenient and efficient for retrieving and storing information in the database.
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2. It describes the different people involved with DBMS - database administrators who manage the system, designers who design the database structure, application programmers who write programs to interact with the database, and end users.
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The document defines key concepts related to database management systems (DBMS) including what a DBMS is, the different levels of database architecture (external, conceptual, internal), data definition language (DDL), normalization, entity relationship (ER) modeling, and database normalization forms. It provides examples to illustrate database concepts and discusses the advantages of using a DBMS compared to traditional file management systems.
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This document discusses database management systems and the three-level architecture. It covers the internal or physical view, which concerns the physical implementation of the database. It also discusses data independence, where changes to lower levels do not affect upper levels. The types of data independence are logical, where changes to the conceptual model do not affect external views, and physical, where changes to the internal model do not affect the conceptual model. Other topics covered include the functions of a DBMS, different DBMS environments like single-user, multi-user, and client-server, and an assignment for students on the three-level architecture.
DBMS Part1.pptx
The document provides an introduction to database management systems. It defines key terms like data, information, database, and record. It describes the differences between manual and computerized data processing. It explains that a database management system (DBMS) is software that manages databases and allows data to be easily accessed, managed, and updated. It then discusses the history of DBMS, common applications of databases, the data processing cycle, features of databases, types of database users, concepts of data abstraction, and database system architectures.
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Architecture of dbms
- 1. Somesh Gulati Assistant Professor Dept. of Comp. Sci. and App.
- 2. Three levels of Architecture External Level Conceptual Level Internal Level Type of Users Admin Designer End Users Data Independence Logical Data Independence Physical Data Independence
- 4. Physical representation of the Database on the Computer. How the data is stored in database? Physical implementation of Database Storage Space allocation for data Data compression, encryption etc.
- 5. The logical structure of the entire database. What data is stored in the database. The relationships among the data. It represents: Entities, Attributes, Relations. Constraints on data. Semantic information data Security
- 6. User’s view of the database. Consisting of a number of different external views of the database. The user is not aware of the existence of any attributes that are missing from the view. It permits users to access data in a way that is customized to their needs.
- 7. Admin: Maintain the database. Designer: Identify and design the set of entities, relations, constraints, and views. End Users: End users are those who actually takes the benefit of having DBMS.
- 8. The process of transforming requests and results between levels are called mappings. Two types of mappings: Conceptual-Internal Mapping External-Conceptual Mapping
- 9. Logical data independence: The ability to modify the conceptual schema without having to change external schema. Physical data Independence: The ability to modify the internal schema without having to change conceptual (or external) schema.
- 10. Thank You