ADMS 2511 Lecture Notes - Lecture 5: File Descriptor, Minimax, Query Language

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Adms 2511 chapter 5 notes: data and knowledge management. Single version of the truth for the company"s master data: transaction data generated and captured by operational systems, describe the business"s activities, or transactions(payroll cheque, customer invoice) looks at specific values . 4. 3 types of data; use the data hierarchy; build e-r (entity relationship) diagrams: data file - collection of logically related records; in a f le management environment, each application has a specific data f le related to it. This file contains all of the data records the application requires: databases are arranged so that one set of software programs the database management system provides all users with access to all of the data. Minmizes the following problems: data redundancy: the same data are stored in multiple locations, data isolation: applications cannot access data associated with other applications. Data inconsistency: various copies of the data do not agree.

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