And development of data management technology

Database System Overview

And development of data management technology

First, what is the data management
- data classification, organization, encoding, storage, retrieval and maintenance
- data processing center problems

Second, the development of data management technology
- Artificial management phase (before 50 years of the 20th century)
- File System stage (late 1950s - in the 1960s)
- Database system stage (late 1960s - now)

1. Artificial management phase
   Features:
   - Managers of data: the user (programmer), the data is not saved
   - data-oriented objects: an application
   - the degree of data sharing: no sharing, great redundancy
   - data independence: not independent, completely dependent on the program
   - structured data: unstructured
   - control data: the application itself controls
   correspondence between an application and data:

2. Phase file system
   features:
   - managers: file system, data can be stored for a long
   - an object-oriented data: an application
   - data sharing is: shared poor, redundancy degree
   - structured data: a structure in the recording, overall unstructured
   - data independence: independence of the poor
   - control data: application to control their own
   correspondence between an application and the data:

3. Phase database system
   features:
   - structured data
   - data sharing is high, low redundancy and easy expansion
   - high data independence
   - the data from the database management system of unified management and control of
   correspondence between an application and the data:

4. Summary
Graduate interview focused into electricity
Database systems and file system What are the advantages compared to?

Third, the development of dynamic data management technology
- driven application requirements
- development of computer hardware
- Computer Software Development