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Database technology

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Database technology

  1. 1. Database Technology
  2. 2. Database Technology  Database is a computer based record keeping system which is used to record maintain and retrieve the data. It is an organized collection of interrelated data. A database management system (DBMS) is a computer software application that interacts with the user, other applications, and the database itself to capture and analyze data.
  3. 3. Database Security  Database security deals with all various aspects of protecting the database content, its owners, and its users. It ranges from protection from intentional unauthorized database uses to unintentional database accesses by unauthorized entities (e.g., a person or a computer program). Database access control deals with controlling who (a person or a certain computer program) is allowed to access what information in the database. The information may comprise specific database objects (e.g., record types, specific records, data structures), certain computations over certain objects (e.g., query types, or specific queries), or utilizing specific access paths to the former (e.g., using specific indexes or other data structures to access information).
  4. 4.  Database access controls are set by special authorized (by the database owner) personnel that uses dedicated protected security DBMS interfaces.  Data security in general deals with protecting specific chunks of data, both physically (i.e., from corruption, or destruction, or removal; e.g., see physical security), or the interpretation of them, or parts of them to meaningful information (e.g., by looking at the strings of bits that they comprise, concluding specific valid credit- card numbers; e.g., see data encryption).
  5. 5. Types of Database.  Centralized Database  In Centralized database system, all data is stored at a single site. It offers a great control in accessing and updating data. However failure chances are high because the system depends on the availability of resources at the central site
  6. 6.  Distributed Database  In Distributed Database system, the database is stored on several computers. Computers in a distributed system may communicate with one another through internet/intranet/telephone lines etc. Most of the distributed systems will be geographically separated and managed. Distributed databases can also separately be administered

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