Data base management system


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Data base management system

  1. 1. Data base management system <br />Data base management system is the collection of four word.<br />Data is a collection of raw facts<br />Base means object of data<br />Management in general way work done in systematic way that’s called management. <br />
  2. 2. oldest components associated with computers, the database management system, or DBMS, is a computer software program that is designed as the means of managing all databases that are currently installed on a system hard drive or network. Different types of database management systems exist, with some of them designed for the oversight and proper control of databases that are configured for specific purposes. Here are some examples of the various incarnations of DBMS technology that are currently in use, and some of the basic elements that are part of DBMS software applications.<br />
  3. 3. The following are examples of database applications: <br /><ul><li>computerized library systems
  4. 4. automated teller machines
  5. 5. flight reservation systems
  6. 6. computerized parts inventory systems </li></li></ul><li>From a technical standpoint, DBMSs can differ widely. The terms relational, network, flat, and hierarchical all refer to the way a DBMS organizes information internally. The internal organization can affect how quickly and flexibly you can extract information. <br />
  7. 7. Requests for information from a database are made in the form of a query, which is a stylized question. For example, the query <br />SELECT ALL WHERE NAME = "SMITH" AND AGE > 35 <br />requests all records in which the NAME field is SMITH and the AGE field is greater than 35. The set of rules for constructing queries is known as a query language. Different DBMSs support different query languages, although there is a semi-standardized query language called SQL(structured query language). Sophisticated languages for managing database systems are called fourth-generation languages, or 4GLs for short. <br />
  8. 8.                 <br />What is an Entity <br />Entity can be an account, activity, or contact about which data can be stored. <br />weak entity is the one that does not exit own its own(depend on other entity) <br />strong entity is the one that is indepenent<br />Primary key<br />Every entity (unless it is a weak entity) must have a minimal set of uniquely identifying attributes, which is called the entity's primary key<br />
  9. 9. An object or entity is characterized by its properties or attributes. In relational database systems attributes correspond to fields<br />
  10. 10. What Is Relationship In DBMS?<br />A relationship is an combination (association) among the instance of one or more entity type.    That is of interest to the organization<br />