Object-relational database

Features
1. Advantages
  1. Ease of use
  2. Flexibility
  3. Precision
  4. Security
  5. Data Independence
  6. Data Manipulation Language
2. Disadvantages
  1. machine performance
  2. Schema Changes
  3. Language Dependence
  4. Lack of Ad-Hoc Queries
object types
1. model real-world entities
2. Object Columns
  1. An object column is a column in a table that is defined using an object type.
3. Object Tables
  1. object table is a table in which each row contains one object of a given object type.
NULL
1. atomic NULL
  1. object can be atomically NULL
    1. cannot be updated
2. NULL attributes
  1. object can have attributes that are NULL
    1. Updates on its individual attributes
      1. Must use cascade clause
collection types
1. VARRAY
  1. variable sized array which has ordered set of data elements of the same type.
2. Nested tables
  1. Tables are ordered set of elements of the same data type

Resource summary

	Created by adamelvin786 about 11 years ago