Database management Systems
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A database management system (DBMS) is software that allows users to create, manage, and access databases. It provides advantages like reducing data redundancy, eliminating inconsistencies through centralized control, ensuring data integrity, and allowing data to be shared and accessed by multiple applications and users. Key concepts include primary keys to uniquely identify records, foreign keys to link tables, and relational databases having structured relationships between tables compared to flat files. Popular DBMS vendors include Microsoft Access for desktop databases.
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The document discusses database management systems (DBMS). It provides examples of DBMS applications like library systems, ATMs, and inventory systems. It explains that DBMSs organize data internally in relational, network, flat, or hierarchical structures. Queries to a database use a structured query language (SQL) to retrieve specific records by fields. Entities in a database represent real-world objects and are characterized by their attributes and primary keys. Relationships associate instances of different entity types that are relevant to an organization.
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A database management system (DBMS) is a set of computer programs that controls the organization, storage, management and retrieval of data in a database. It consists of several components including a DBMS engine that converts logical requests into physical operations, data definition and manipulation subsystems that help users add, change and delete data, and an application generation subsystem that helps develop data-intensive applications. Common DBMS models include hierarchical, network, relational, multidimensional and object-oriented models. Key DBMS capabilities include querying, backup and replication, rule enforcement, security, computation, logging and optimization.
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The document discusses key concepts related to databases and database management systems. It defines a database as a collection of organized data and a database management system as a computer program that allows for creating, accessing, managing and controlling databases. It describes three common data models - relational, network and hierarchical - and explains some fundamental database concepts like tables, keys, relations and normalization.
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The document discusses key concepts related to databases and database management systems. It defines a database as a collection of organized data and a database management system as a computer program that allows for creating, accessing, managing and controlling databases. It describes three common data models - relational, network and hierarchical - and explains some fundamental database concepts like tables, keys, relations and normalization.
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2. It describes some problems with traditional file-based data storage like redundancy, inconsistency, and lack of flexibility. A database addresses these issues through centralization of data.
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Assign 1
(1) DBMS provides centralized management of data which reduces redundancy and inconsistencies.
(2) It enforces data integrity through features like controlling access to data, enforcing rules and standards.
(3) DBMS allows for multiple user interfaces and access to data through query tools and programming interfaces.
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The document discusses database management systems (DBMS) and relational database management systems (RDBMS). It defines them and explains some of their key advantages, including data independence, consistency, control over redundancy, and greater security. It also describes the roles of a database administrator (DBA) and how they design, implement, and maintain the database environment. Finally, it provides brief definitions of data warehousing as a repository for organizational data and data mining as the process of extracting patterns from stored data.
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2. It describes some problems with traditional file-based data storage like redundancy, inconsistency, and lack of flexibility. A database addresses these issues through centralization of data.
3. The key components of a database system are described as people, hardware, software, and data. The database management system (DBMS) acts as an interface between users, applications, and the stored data.
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1) Database languages have two parts - data definition languages (DDL) to define schemas and data manipulation languages (DML) to manipulate data.
2) A DBMS provides functions like data storage, retrieval, updating, security and integrity constraints.
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- 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. Advantages of DBMS 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. It also eliminates the extra processing necessary to trace the required data in a large mass of data.
- 4. Advantages of DBMS Elimination of Inconsistencies: The main advantage of avoiding duplication is the elimination of inconsistencies that tend to be present in redundant data files. Any redundancies that exist in the DBMS are controlled and the system ensures that these multiple copies are consistent
- 5. Advantages of DBMS Integrity: Centralized control can also ensure that adequate checks are incorporated in the DBMS to provide data integrity. Data integrity means that the data contained in the database is both accurate and consistent. Therefore, data values being entered for the storage could be checked to ensure that they fall within a specified range and are of the correct format.
- 6. Advantages of DBMS Data Independence: Data independence is usually considered from two points of view: physical data independence and logical data independence.
- 7. Advantages of DBMS Shared Data: A database allows the sharing of data under its control by any number of application programs or users. For example, the applications for the public relations and payroll departments can share the same data.
- 8. Primary key and Foreign key The primary key of a relational table uniquely identifies each record in the table. A foreign key is a field in a relational table that matches the primary key column of another table. The foreign key can be used to cross- reference tables.
- 9. Flat files In databases a flat file refers to data files that contain records with no structured relationships. Flat files may contain only basic formatting, have a small fixed number of fields, and it may or may not have a file format.
- 10. Advantages of relational databases over flat files
- 11. Example of database management system DBMS Vendor Type Primary Market Access (Jet, MSDE) Microsoft R Desktop