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872663
Object-relational database
Description
All of the above was reproduced courtesy of Mohsan Ali.
No tags specified
database server management
object orented database management
Mind Map by
adamelvin786
, updated more than 1 year ago
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Created by
adamelvin786
about 10 years ago
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Resource summary
Object-relational database
Features
Advantages
Ease of use
Flexibility
Precision
Security
Data Independence
Data Manipulation Language
Disadvantages
machine performance
Schema Changes
Language Dependence
Lack of Ad-Hoc Queries
object types
model real-world entities
Object Columns
An object column is a column in a table that is defined using an object type.
Object Tables
object table is a table in which each row contains one object of a given object type.
NULL
atomic NULL
object can be atomically NULL
cannot be updated
NULL attributes
object can have attributes that are NULL
Updates on its individual attributes
Must use cascade clause
collection types
VARRAY
variable sized array which has ordered set of data elements of the same type.
Nested tables
Tables are ordered set of elements of the same data type
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