Page 61 - Demo

%u062c%u0645%u064a%u0639 %u0627%u0644%u062d%u0642%u0648%u0642 %u0645%u062d%u0641%u0648%u0638%u0629 %u0640 %u0627%u0625%u0644%u0639%u062a%u062f%u0627%u0621 %u0639%u0649%u0644 %u062d%u0642 %u0627%u0645%u0644%u0624%u0644%u0641 %u0628%u0627%u0644%u0646%u0633%u062e %u0623%u0648 %u0627%u0644%u0637%u0628%u0627%u0639%u0629 %u064a%u0639%u0631%u0636 %u0641%u0627%u0639%u0644%u0647 %u0644%u0644%u0645%u0633%u0627%u0626%u0644%u0629 %u0627%u0644%u0642%u0627%u0646%u0648%u0646%u064a%u062961Data Base Management Systems: They are programs that can be used to create and manipulate a database. In other words, it is a multipurpose application that facilitates the definition, construction and manipulation of databases. Such as: MS- Access, Oracle, MySQL Data Base Systems: It is a specific method for organizing data that simplifies how it is entered, modified and extracted in an appropriate andunderstandable image for the user, either in the same entered form or grouped in the form of statistics, reports or query screens with control over each process. Database systems are databases + database management systems. Before the emergence of databases, the common system for saving data was the Data File Systems, which is electronic files used such as Word and Excel files. This system has many disadvantages such as: Data duplication: Repetition of data in more than one file, which wastes storage space, effort and time. Data heterogeneity or incompatibility: the same information is stored in more than one file, and when it is modified in a file, we may not modify it in other files. Inflexibility: The process of modification and deletion requires effort, time and high cost. -Difficulty of maintenance: any modification of a file requires modification of all its programs. -Data security: the confidentiality of information is to a limited extent. Lack of standard specifications. Very limited sharing between different programs and data files. Databases are considered one of the good solutions to the problems of the data file systems environment, most notably the problem of data repetition and its negative repercussions on the use of storage media, information conflict and the consequent costs of preserving, operating and maintaining it. This, bearing in mind that updating any data does not mean updating it at the system level, but is limited to the file The person concerned with this update, which causes data integrity and the inability to impose centralized management and security control that protects