Post on 21-Dec-2015
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OODBMS & ORDBMS
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Dr. Mario Guimaraes
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Database History
• 1960s Legacy Systems: Hierarchical and Network DBMS
• 1970s Relational DBMS• 1980s Non conventional DBMS
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Limitations of RDBMS
Relational Database works well to store just text and numbers as long as there are not many multi-valued attributes.
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Advantages of ORDBMS,OODBMS
• Multi-valued attributes,• Super/Sub-types: inheritance• Interfaces well with OOPL• Multi-media
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DBMS + OO
• Serve many applications• Integrity constraints• Concurrency• Security• Views• Easy query language• Permanent Objects
• Classes and Objects• Properties and Methods• Events and Messages• Inheritance• Encapsulation• Multiple Inheritance and
Polymorphism
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Characteristics of OODBMS
• Not as standard as Relational DBMS• Object ID (system unique, immutable, not visible by end-user)
• Versions• Many different types of records as opposed
to Relational DBMS (many instances of few different types of records)
• Spatial Component
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Common OO Applications
• Computer-aided design (CAD) • Computer-aided manufacturing (CAM)• Geographic information systems (GIS) • Office Automation• Computer-aided publishing• Multimedia databases
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Non Conventional DBMS
• Object Relational (Extend the Relational Model)
• Construct an OODBMS from scratch• Knowledge Base Management Systems
(OODBMS).
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Object Relational
• Examples:Informix Universal Server (many OO features)
Oracle (limited)MS-Access (very limited, picture field)
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Informix Universal Server-History
• INGRES (Relational DBMS – UC Berkeley)• POSTGRES (OO features added to
INGRES at UC Berkeley)• Montage -> Miro -> Ilustra• Ilustra + Informix (relational DBMS that
dominated market in 80s with Sybase & Oracle)
• IBM bought Informix
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Datatypes in Informix US
• Two dimensional data type (line circle, polygon, path)
• Image data types: supports TIFF, GIF, JPEG, photoCD, GROUP 4 and Fax.
• Time series data type• Opaque, Distinct, Row type and Collection Type
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POSTGRES: Open source
• DBMS is free and can modify source code
• Take over MySQL as the # 1 open source DBMS ?
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Oracle
• Multivalued attributes using VARRAY• Object type• BLOB (Binary large object), CLOB (Characters),
BFILE (Binary File), NCLOG (Intern. Characters)• 9i: Inheritance
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OODBMS references (products)
• O2 http://o2tech.com• Gemstone http://www.gemstone.com• Objectstore http://www.odi.com• ITASCA http://www.iprolink.ch/ibex.com
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ORDBMS examples
• Points, Lines and Circles• ASU: University DB Example
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Knowledge Base/Deductive DB
• Expert System + Database Technology• Stores rules instead of data• Basically Prototypes available at Universities
and Research Institutions
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Examples of Knowledge Base DBMS
Datalog (combines PROLOG + Database technology).http://goanna.cs.rmit.edu.au/~zahirt/Teaching/subj-datalog.html
XSBhttp://www.cs.sunysb.edu/~kostis/Papers/xsb_ddb.html
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GIS Life Expectancy
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GIS Population
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End of Lecture
End Of
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Lecture.