database management systems cs403 power point slides lecture 02
TRANSCRIPT
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In the name
of
Allah
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Database Management
Systems
Lecture -2
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An overview of lecture - 1
• Database definitions• Database history• File processing systems
– Shortcomings• Advantages of database approach
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What we are going to study
next?
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• More advantages of database approach
• Disadvantages• Data, its levels• Database users• Some common terms
Lecture Overview
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Other Advantages Data consistencyBetter data securityImproved data standards
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Balancing of conflicting requirements
Faster development of new applications
Better data accessibility
They also provide
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• Economy of scale
• Better control concurrency
• Better backup and recovery procedures
They also provide
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BUTIts not always just
theSUGAR
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Disadvantages• Higher costs
• Conversion cost
• More difficult recovery
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Summary of DB Pros n Cons
• A very useful approach for data processing Provide a
???
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Data As ResourceResource
Any asset that is of value to an organization and that incurs cost
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Is DataA Resource ? ? ?
Data As Resource
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Levels of Data• Real-world data• Metadata• Data Occurrence
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Database Users• Application Programmers• End Users
– Naïve– Sophisticated
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Database Users• Database Administrator (DBA)
A person who has central control over data and programs that access this data
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Functions of DBASchema definitionGranting data access
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Functions of DBARoutine Maintenance
BackupsMonitoring disk spaceMonitoring jobs running
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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
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LOOK we are approaching
THE END
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Common Terms • Data • Information• Database Management system
(DBMS)
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Common Terms • Data: Facts concerning things, such as
people, objects, or events
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Common Terms • Information: Data that have been processed
and presented in a form suitable for human interpretation
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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
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DBMS:A software that handles all access to the database
Common Terms
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DBMS:A software that is responsible for applying the authorisation checks and validation procedures
Common Terms
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Database Management
Systems
Lecture -2