(1) data independence. It means that in an information system using a database, the physical storage of data generated by business transactions or events is separated from the use or application.
(2) data standardization. This means that the data elements in the database have standardized meanings and forms.
(3) Data input and storage. Data generated by business transactions or events are entered into the database at one time and stored in a certain location.
(4) Data integration. The database can flexibly store transaction data by using logical relationship structure to form different data sets.
(5) Data * * *. The integration of data leads to the characteristics of data sharing, and all the data in the database are owned by all users of the enterprise or organization.
(6) Centralized data management. Information systems that use databases usually have specialized database administrators to centrally manage all data, resources and DBMs operations.
Advantages of database system:
(1) The independence and standardization of data enhance the flexibility of data storage and application, make the writing and modification of application programs simpler and faster, and save costs.
(2) Data integration and online data access can reduce duplicate data storage and eliminate inconsistencies among data elements, thus saving data storage space, shortening data access time and enhancing data credibility.
(3) The characteristics of data integration and data sharing can improve the efficiency of data access and application, thus making it easier to store the required data and meet various data requirements.
(4) The centralized management of data enhances the security and internal coordination of data, which can effectively prevent unauthorized personnel from accessing data without authorization, and data records can be updated in time.
However, the current development stage of database system still has some limitations, which are mainly reflected in three aspects: (1) the cost is relatively high. Because the hardware and software of the database are relatively more complex, these hardware and software devices are more expensive. (2) The initial resistance is large. Database system is obviously different from the general data document system, and it often encounters great resistance in the initial stage of database development. For example, system developers encounter difficulties because they are not familiar with database technology. (3) system fragility. The data stored in the database is highly integrated. If one of the hardware and software in the system fails, the whole database and all applications may not work.