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7 data management design

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Châu Thanh Chương
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Data Management Design
Content ,[object Object],[object Object],[object Object],[object Object]
Persistence ,[object Object],[object Object],[object Object],[object Object],[object Object]
Persistence Mechanisms and Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Persistence Design Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
File Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],12345678901234567890123456789012345 Simon Bennett Leicester GB 213 67890123 22012002 ” Simon”,”Bennett”,”Leicester”,”GB”,213,”22-01-2002” 1,”Simon”,”Bennett” 2,1,”0077098641”,2002 2,2,”0077096738”,2001 <Author> <Forename>Simon</Forename> <Surname>Bennett</Surname> </Author >
Database Management Systems (DBMS) ,[object Object],[object Object],[object Object],[object Object],[object Object]
DBMS ,[object Object],[object Object],Database Application 1 Application 2
DBMS Schema ,[object Object],Conceptual Schema External Schema Internal Schema The view on data used by application programs. The logical model of data that is separate from how it is used. The physical storage of data in files and indexes.
DBMS Features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Advantages & Disadvantages of DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Types of DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object]
Types of DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Using OODBMS for OBJECTS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why RDBMS is still used for objects ? ,[object Object],[object Object],[object Object]
Using Relational DBMS for OBJECTS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Flattening Objects to Tables: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Flattening Objects to Tables - Normalization ,[object Object],[object Object],[object Object]
Normalization Example
Objects as a Table ,[object Object]
First Normal Form
Second Normal Form
Third Normal Form
Alternative Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Alternative Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object DBMS ,[object Object],[object Object],[object Object],[object Object]
Object DBMS ,[object Object],[object Object],[object Object]
Designing Data Management Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PersistentObject ,[object Object],[object Object],[object Object],[object Object],PersistentObject {Abstract} - objid: int - iterator: RandomAccessFile + getObject( ): Object + store( ) + delete( ) + update( ) + iterate( ): Object + write( ) {Abstract} + read( ) {Abstract} Location - locationCode: String - locationName: String - intCampaignList: IntCampaign[ *] + findByLocationCode( String ): Location + iterateLocation( ): Location + iterateIntCampaign( ): IntCampaign + addIntCampaign( IntCampaign ) + removeIntCampaign( String) + numberOfCampaigns( ): int + write( ) + read( )
Database Broker ,[object Object],Singleton class Location LocationBroker - instance: LocationBroker - LocationBroker( ) + instance( ): LocationBroker + findByLocationCode( String ): Location + iterateLocation( ): Location materializes
Inheritance Hierarchy of Database Brokers DatabaseBroker RelationalBroker FileBroker IntCampaignBroker LocationBroker IntCampaign Location materializes materializes
Using a Framework ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Using a Framework ,[object Object],[object Object],[object Object],[object Object],[object Object]

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7 data management design

Notes de l'éditeur

  1. Examples of transient objects include instances of boundary and control classes and the objects used in applications like on-screen calculators. (Note for computer science students, the objects in a calculator may include things like stacks and registers, not just digits or floating point numbers.) Persistent objects include the books, borrowers and loans in a library system. A loan of a book to a borrower may be created on one occasion on one machine, and is accessed from another machine on another occasion, for example to send out overdue book reminders.
  2. Ask what kind of design trade-offs might have to be made with these different kinds of file record structures. Fixed length (padded) – easy to process, but wastes storage Variable length (delimited) – more difficult to process (looking for delimiters), but saves storage space Header and detail – allows for structure in data, may need line type and line no. Tagged data (XML) – self-describing, but storage overhead for tags.