This document provides an overview of object-relational database management systems (ORDBMS). It discusses why vendors extended relational database systems to include object-oriented features, such as user-defined types, inheritance, polymorphism and complex objects. It covers the advantages of ORDBMS in resolving weaknesses of RDBMS while preserving existing relational applications. The document also reviews new object-oriented features introduced in SQL:2003, including row types, user-defined types, reference types, user-defined routines, subtypes/supertypes, and collection types.
Object relational database management systemSaibee Alam
this presentation provide a full explanation of object relational database management system. its a part of advanced database management system. important topic of computer science if you are UG/PG student or preparing for some competitive exam.
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Object relational database management systemSaibee Alam
this presentation provide a full explanation of object relational database management system. its a part of advanced database management system. important topic of computer science if you are UG/PG student or preparing for some competitive exam.
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An OODBMS is the result of combining object oriented programming principles with database management principles. Object oriented programming concepts such as encapsulation, polymorphism and inheritance are enforced as well as database management concepts such as the ACID properties (Atomicity, Consistency, Isolation and Durability) which lead to system integrity, support for an ad hoc query language and secondary storage management systems which allow for managing very large amounts of data. The Object Oriented Database Manifesto specifically lists the following features as mandatory for a system to support before it can be called an OODBMS; Complex objects, Object identity, Encapsulation , Types and Classes , Class or Type Hierarchies, Overriding, overloading and late binding, Computational completeness , Extensibility,Persistence , Secondary storage management, Concurrency, Recovery and an Ad Hoc Query Facility.
Overview of Object-Oriented Concepts Characteristics by vikas jagtapVikas Jagtap
Object-oriented data base systems are proposed as alternative to relational systems and are aimed at application domains where complex objects play a central role.
The approach is heavily influenced by object-oriented programming languages and can be understood as an attempt to add DBMS functionality to a programming language environment
Overview of Object-Oriented Concepts Characteristics by vikas jagtapVikas Jagtap
Object-oriented data base systems are proposed as alternative to relational systems and are aimed at application domains where complex objects play a central role.
The approach is heavily influenced by object-oriented programming languages and can be understood as an attempt to add DBMS functionality to a programming language environment
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2. 2
Overview
Why ORDBMS?
What is ORDBMS?
Stonebreaker’s view
Advantages and disadvantages of
ORDBMS
New OO features in SQL
Comparison between OODBMS and
ORDBMS
3. 3
Why ORDBMS – Extending
RDBMS
Vendors of RDBMSs conscious of threat and
promise of OODBMS.
Agree that RDBMSs not currently suited to
advanced database applications, and added
functionality is required.
Reject claim that extended RDBMSs will not
provide sufficient functionality or will be too
slow to cope adequately with new
complexity.
Can remedy shortcomings of relational
model by extending model with OO features.
4. 4
What is ORDBMS?
ORDBMS is a relational database with OO
features.
OO features being added include:
User-extensible types.
Encapsulation.
Inheritance.
Polymorphism.
Dynamic binding of methods.
Complex objects.
Object identity.
6. 6
Advantages of ORDBMSs
Resolves many of known weaknesses of
RDBMS.
Reuse and sharing:
reuse comes from ability to extend server to
perform standard functionality centrally;
Preserves significant body of knowledge and
experience gone into developing relational
applications.
7. 7
Disadvantages of ORDBMSs
Complexity.
Increased costs.
Proponents of relational approach believe
simplicity and purity of relational model are
lost.
Some believe RDBMS is being extended for
what will be a minority of applications.
OO purists not attracted by extensions
either.
SQL now extremely complex.
8. 8
SQL:2003 - New OO Features
Type constructors for row types and
reference types.
User-defined types (distinct types and
structured types) that can participate in
supertype/subtype relationships.
User-defined procedures, functions, methods,
and operators.
Type constructors for collection types
(arrays, sets, lists, and multisets).
Support for large objects – BLOBs and
CLOBs.
Recursion.
9. 9
Row Types
Sequence of field name/data type
pairs that provides data type to
represent rows in tables.
Allows complete rows to be:
stored in variables,
passed as arguments to routines,
returned as return values from function calls.
Also allows column of table to contain
row values.
10. 10
User-Defined Types (UDTs)
SQL:2003 allows definition of UDTs.
May be used in same way as built-in types.
Subdivided into two categories: distinct types
and structured types.
Distinct type allows differentiation between same
underlying base types.
Structured type consists of a group of other types
(built-in or UDT).
11. 11
Reference Types and Object
Identity
References allow
A row to be shared among multiple tables. and
Users to replace complex join definitions in
queries with much simpler path expressions
(similar to OODBMS).
12. 12
User-Defined Routines (UDRs)
UDRs define methods for manipulating data.
UDRs may be defined as part of a UDT or
separately as part of a schema.
UDRs may be
externally provided in standard programming
language (exp. C).
or defined completely in SQL.
UDR may be a procedure, function, or
method.
A procedure has input and output parameters.
A function has input parameters and must return
a value.
A method must be a part of UDT.
13. 13
Subtypes and Supertypes
UDTs can participate in
subtype/supertype hierarchy.
Subtype inherits all the attributes
and behavior of its supertypes.
Can define additional attributes and
methods and can override inherited
methods.
14. 14
Subtables and Supertables
No mechanism to store all instances of given UDT,
unless user explicitly creates a single table in which all
instances are stored.
Thus, in SQL:2003 may not be possible to apply an
SQL query to all instances of a given UDT.
Can use table inheritance, which allows table to be
created that inherits all the rows of one or more
existing tables.
Subtable/supertable independent from UDT
inheritance facility.
Subtable/supertable: rows are inherited.
Subtype/supertype: attributes and methods are
inherited.
15. 15
Collection Types
ARRAY: ordered 1D array with maximum
number of elements without duplicates.
LIST: ordered collection that allows
duplicates.
SET: unordered collection without duplicates.
MULTISET: unordered collection that allows
duplicates.
Similar to those in OODBMS
(What were MULTISETs called in OODBMS?).
16. 16
Large Objects
A table field that holds large amount
of data.
Three different types:
Binary Large Object (BLOB).
Character LOB (CLOB).
National CLOB.
Unlike SQL2, in SQL:2003, LOB does
allow some operations to be carried
out in DBMS server.