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Database v1
Database v1engahmadhassan This document provides an overview of key database concepts including:
- What a database is and its main functions
- The different types of keys such as candidate keys, primary keys, and foreign keys
- Database management systems and their role
- Common database models like relational and hierarchical
- Issues related to data such as redundancy, consistency, sharing, and concurrency
- Additional concepts such as data integration, integrity constraints, security, and independence
Unit1 dbms
Unit1 dbmsgowrivageesan87 This document discusses database management systems (DBMS) and their components. It describes DBMS as a set of programs that allow for the storage and retrieval of data. It then discusses the key components of a DBMS including the physical, logical, and view levels of abstraction, data models, data independence, data definition and manipulation languages like SQL, and the roles of database administrators and users. The document provides an overview of the architecture and design of database systems.
DBMS Part1.pptx
DBMS Part1.pptxProf. Dr. K. Adisesha 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.
DBMS.pptx
DBMS.pptxProf. Dr. K. Adisesha The document provides an introduction to database management systems and related concepts. It defines key terms like data, information, database, and record. It describes the differences between manual and computerized data processing. It then discusses traditional file-based data storage approaches and their limitations. The document introduces database management systems and their applications. It provides a brief history of DBMS and discusses the data processing cycle and the roles of different database users. Finally, it covers various database models including hierarchical, network, relational, object-oriented, and object-relational models.
Unit 1: Introduction to DBMS Unit 1 Complete
Unit 1: Introduction to DBMS Unit 1 CompleteRaj vardhan This document discusses database management systems (DBMS) and their advantages over traditional file-based data storage. It describes the key components of a DBMS, including the hardware, software, data, procedures, and users. It also explains the three levels of abstraction in a DBMS - the physical level, logical level, and view level - and how they provide data independence. Finally, it provides an overview of different data models like hierarchical, network, and relational models.
01-database-management.pptx
01-database-management.pptxdhanajimirajkar1 1. The document discusses the components and overall structure of a database management system (DBMS). It describes the various levels of database architecture including the physical, logical, and external levels.
2. The key components of a DBMS include users, a query processor, storage manager, and data structures. The query processor consists of a DML compiler, DDL interpreter, and query evaluation engine. The storage manager includes modules for authorization, transactions, file management, and buffering.
3. Data models help represent the design of a database and describe entities, attributes, relationships, and constraints. Common models include the entity-relationship model and object-oriented model.
1-introduction to DB.pdf
1-introduction to DB.pdfMuniraALmogren The document provides an introduction to database principles. It discusses the limitations of file-based data management systems and how database management systems were developed to overcome these limitations. The key components of a database system are described, including the database, database management system, and application programs. Roles in a database environment like database administrators and end users are defined. Advantages of relational database management systems like controlling redundancy and improving data integrity are outlined. Some disadvantages of database systems like complexity and increased hardware costs are also noted.
Introduction to DBMS.pptx
Introduction to DBMS.pptxChandanHegde13 The document provides an introduction to basic concepts of database systems including definitions of data, information, and knowledge. It discusses data/information processing and what a database and DBMS are. The main characteristics of the database approach are described including self-describing nature, insulation between programs and data, data abstraction, and support of multiple views. The document also discusses database users including actors on the scene like DBAs and end users, and workers behind the scene like DBMS designers. Finally, it briefly introduces some common data models like hierarchical, network, entity-relationship, relational, and object-oriented models.
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Database management system basic, database, database management, learn database, database system
- 2. BASIC CONCEPTS 1. What is a database? A database is a collection of interrelaated data which can be used: • alone, or • combined / related to other data to provide answers to the user’s question. 2.What is Database Management System? A database management system (DBMS) is system software for creating and managing databases. The DBMS provides users and programmers with a systematic way to create, retrieve, update and manage data.
- 3. 1. Retrieve data that are both convenient and efficient 2. Safety of information stored in DBMS . 3. Avoid possible anomalous result.
- 4. a) BANK :For customer ,informaion , account,and loans, and transaction. b) Airline: For reservation and schedule information. Airline were among the first to use database in a geographically distributed manner terminals situated around the world accessed the central database system through phone lines and other data network. c) Universities: For students information, course registration, and grades. d) Credits card transaction: For purchases on credits cards and generation of monthly statements. e) Sales: For customer, product, and purchase information. e) Human resources: For information about employees, salaries, payroll taxes and benefits, and for generation of paychecks.
- 5. a) Data redundancy and inconsistency b) Difficulty in accessing data c) Data isolation d) Integrity problems e) Atomicity problems f) Concurrent-access anomalies g) Security problems
- 6. 1 DATA ABSTRACTION • Physical Level: The lowest level of abstraction describeshow the data are actually stored. • Logical Level: The next –higher level of abstraction describes what data are actually stored in the database, and what relationship exist among those data. • View Level: The highest level of abstraction describes only part of the entire database.
- 7. View of data View 1 View 2 View n Logical level Physical level
- 8. * Reduction of Redundancies: Centralized control of data by the DBA avoids unnecessary duplication of data and effectively reduces the total amount of data storage required. *Elimination of Inconsistencies: The main advantage of avoiding duplication is the elimination of inconsistencies that tend to be present in redundant data files.
- 9. * Integrity: Centralized control can also ensure that adequate checks are incorporated in the DBMS to provide data integrity. *Data Independence: Data independence is usually considered from two points of view: physical data independence and logical data independence. *Shared Data: A database allows the sharing of data under its control by any number of application programs or users