Database Management Systems ISYS 464. Fall 200 6 David Chao. Introduction to Databases. The most important component in an information system Created to support all levels of business operations: Day-to-day operations TPS, CRM, ERP Decision-makings DSS Strategic plans. Definitions.
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Dim fileNumber, stCounter As Integer
Dim SID, SNAME As String
Dim gpa, sumGpa As Double
fileNumber = FreeFile()
FileOpen(fileNumber, "c:\stdata.txt", OpenMode.Input)
Do While Not EOF(fileNumber)
sumGpa += gpa
stCounter += 1
MessageBox.Show(sumGpa / stCounter.ToString)
DBMS manages data resources like an operating system manages hardware resources
Different people have different views of the database…these are the external schema
The internal schema is the underlying design and implementation
1. Presentation – user interface
2. Processing logic
SQL queries GPA
Database Server: A high processing power computer with advanced DBMS.
Client: A PC that runs database applications.
MaintenanceSystems Development Life Cycle(see also Figures 2.4, 2.5)
Prototyping Database Methodology GPA(Figure 2.6)