Database System Cost And Its File Size Essay - 851 Words

1. Answer: Data processing means assembly and manipulation of items of data so that it produces meaningful information. Data means known facts that can be recorded and have implicit meaning. Processing of data can be done in many ways. †¢ Manually †¢ Automatically †¢ Computerized Following are the Advantages: †¢ Using same amount of data acquire more information. †¢ Sharing data †¢ Logical coherence †¢ Represents complex relationships among data †¢ Multiple users having access to the same data †¢ Providing multiple interfaces to different classes of user †¢ Confliction requirements †¢ Controlling redundancy in data storage and in development and maintenance †¢ Facilitating consistency †¢ Enforcing integrity constraints on the database †¢ Expanding security †¢ Backup and recovery services †¢ Data independence maintenance Following are the Disadvantages: †¢ Higher Complexity †¢ Database system cost and its file size †¢ Inefficient execution †¢ Greater impact of failure †¢ Hardship in achieving data recovery 2. Data independence allows application insulation. Physical Data Independence Logical Data Independence The capacity to modify schema definition in on level without disturbing schema definition in the next higher level Capacity to modify the logical schema without causing application program to be rewritten It is easier to accomplish than logical data independence. It is more difficult to accomplish. Modifications include changing from unblocked to blocked record storage, or fromShow MoreRelatedMigration of Database871 Words   |  4 PagesMigration of Databases – An XML Approach XML Database Migration is a project of migrating the existing databases into XML format. Conversion of databases to XML file format, the databases like Ms-Access, Oracle and MS-SQL, MySQL connects in the network or the oracle in the personal computer can be connected for the generation of XML code. Let us consider, user runs a firm with three companies with different database’s respectively. 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