The database system is a system composed of a database and its management software. It is an ideal data processing system developed to meet the needs of data processing. It is also a system for actual operable storage, maintenance and The software system that provides data to the application system is a collection of storage media, processing objects, and management systems.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Database System (Data Base System, DBS for short) is a system composed of database and its management software.It usually consists of software, database and data administrators.
The software mainly includes operating systems, various host languages, utilities and database management systems.
The database is managed uniformly by the database management system, and data insertion, modification and retrieval must be carried out through the database management system.
The data administrator is responsible for creating, monitoring and maintaining the entire database so that the data can be effectively used by anyone who has the right to use it. Database administrators are generally held by personnel with higher professional level and more seniority.
The database system is an ideal data processing system developed to meet the needs of data processing. It is also a storage, maintenance and application system that is actually operational. The software system that provides data is a collection of storage media, processing objects, and management systems.
Features
# Data structure, good data sharing, good data independence, small data storage granularity, The data management system provides users with a friendly interface.
The core and foundation of the database system is the data model. Existing database systems are all based on some kind of data model.
The core of the database system is the database management system.
A database system generally consists of a database, a database management system (DBMS), an application system, a database administrator, and users. DBMS is the foundation and core of the database system.
The basic requirements for the database system are:
①Be able to ensure the independence of data. The independence of data and programs helps speed up software development and save development costs.
②There is less redundant data and a high degree of data sharing.
③The user interface of the system is simple, easy for users to master and easy to use.
④ It can ensure that the system operates reliably and can quickly eliminate failures when they occur; it can protect data from being accessed or destroyed by unauthorized persons; it can prevent the generation of erroneous data and detect it in time once it occurs.
⑤Have the ability to reorganize data and change the data storage structure or data storage location to adapt to changes in user operating characteristics and improve data organization chaos and spatiotemporal performance deterioration caused by frequent insertion and deletion operations. status.
⑥ It is modifiable and expandable.
⑦ Can fully describe the internal relationship between data.
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