The necessity of using the database
1. Structure of storing large amounts of data, user-friendly and effective retrieval access.
2. maintain data consistency, integrity, reduce data redundancy.
3. satisfy shared and fully respect the requirements of the application.
The basic idea of the database
1.数据
Symbol data recording is referred to describe things (Data)
including numbers, text, images, sound, etc.
2.数据库和数据库表
Recording different organizations together to form a 'table'
database is a collection of tables of 3.数据库系统和数据库管理系统
the database system (DBS)
database management system (DBMS)
database administrator (DBA)
History database development
of the first generation database :( database hierarchical model and network model based)
The second generation database :( relational database)
Third Generation :( database for different areas of the new database, object-oriented databases, the "relation of an object 'database)
Database model
is the core with the underlying database system
structure of the performance data ~
~ and operating constraints define a database
containing data structures, data manipulation and data constraints
Classic data model has 'network model' 'hierarchical model' 'relational model'
Introduction mainstream database
1.SQL server (Microsoft product)
for the windows operating system
is easy to use
2.oracle (Oracle product)
for all major platforms
safe and sound, complex operation
3.DB2 (IBM company factory goods)
for all major platforms,
large-scale, fully perfect
4.MySQL (Oracle acquisition)
open source, small size, fast, stable