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This article mainly introduces the development process of data management is divided into which three stages, the article is very detailed, has a certain reference value, interested friends must read it!

The development process of data management is divided into three stages.

Manual management stage

The data is not saved in the computer.

There is no dedicated software to manage the data

There is only the concept of program, not the concept of file

Data oriented program

Because at this stage, computers are mainly used for computing and do not store data. The important reason is that there are no storage devices and software engineering is not mature. Data and programs are not independent of each other, that is, a set of data corresponds to a program.

File system Pha

Data can be stored on disk for a long time.

The logical structure of the data is different from the physical structure.

The organization of documents is diversified.

Data no longer belongs to a particular program and can be reused.

After the development of technology, storage devices have appeared. And software engineering has also been developed, the emergence of the file system is specifically used to manage external data. The meaning of the emergence of the file system is to separate the data so that the data does not depend on a particular program.

However, as the amount of data continues to expand, the file system reveals three flaws

1. Data redundancy: because each application corresponds to a file, due to the lack of connection between these files, it is possible for the same data to be stored repeatedly in multiple files.

two。 Data inconsistency: this is a problem caused by data redundancy problems, when a data update operation is carried out, modifying the data of one file may cause data inconsistency of another file.

3. Weak data links: caused by a lack of links between files. In order to solve the problems in the file system, the data is managed more advanced and more effectively. The emergence of the data management system, which is also familiar with the database technology.

Database phase

Using data model to represent complex data structure

Have high data independence

The database system provides users with a convenient user interface.

The database system provides four data control functions.

Recovery of database

Concurrency Control of Database

Integrity of data

Security of data

In the database phase, we separate the application from the data, when the database provides a unified application interface. So that when the application changes, you do not need to care about the database; when the database changes, you do not need to consider the application. And the database also provides a lot of protection against data loss, corruption and other problems caused by misoperation of the application.

The above are all the contents of the three stages of the development of data management. Thank you for your reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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