Database management systems cs403 power point slides lecture 02
Transcript of Database management systems cs403 power point slides lecture 02
In the name
of
Allah
Database Management
Systems
Lecture -2
An overview of lecture - 1
• Database definitions• Database history• File processing systems
– Shortcomings• Advantages of database approach
What we are going to study
next?
• More advantages of database approach
• Disadvantages• Data, its levels• Database users• Some common terms
Lecture Overview
Other Advantages Data consistencyBetter data securityImproved data standards
Balancing of conflicting requirements
Faster development of new applications
Better data accessibility
They also provide
• Economy of scale
• Better control concurrency
• Better backup and recovery procedures
They also provide
BUTIts not always just
theSUGAR
Disadvantages• Higher costs
• Conversion cost
• More difficult recovery
Summary of DB Pros n Cons
• A very useful approach for data processing Provide a
???
Data As ResourceResource
Any asset that is of value to an organization and that incurs cost
Is DataA Resource ? ? ?
Data As Resource
Levels of Data• Real-world data• Metadata• Data Occurrence
Database Users• Application Programmers• End Users
– Naïve– Sophisticated
Database Users• Database Administrator (DBA)
A person who has central control over data and programs that access this data
Functions of DBASchema definitionGranting data access
Functions of DBARoutine Maintenance
BackupsMonitoring disk spaceMonitoring jobs running
Data, Database, Data Model and DBMS
Database
DBMS“How” to get
Application Programs
“What” to get
End usersinteract
Application Programmers
Database Administrators
Database Designers
develop
maintain
design
Software
Users
Data
LOOK we are approaching
THE END
Common Terms • Data • Information• Database Management system
(DBMS)
Common Terms • Data: Facts concerning things, such as
people, objects, or events
Common Terms • Information: Data that have been processed
and presented in a form suitable for human interpretation
Data, Information and Knowledge
Data Information Knowledge &Customer Insight
Tahira
Amir
Jahangir
Ted Martin
Amex G
old
50,0
00
234wireless
B.A.
Amir MohsinTahira
Jahangir
50,00046,800 29,20075,500
ShoesScarvesJewelry
Groceries
shoes
MoUQty
IncomeEducation
Database Queries ?
Amir is mostlikely to buy new product
Tahira is profitablecustomer and is likely to switch carriers
DBMS:A software that handles all access to the database
Common Terms
DBMS:A software that is responsible for applying the authorisation checks and validation procedures
Common Terms
Database Management
Systems
Lecture -2