Database Administration - How Materialized Views Work with Object Types and Collections

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How Materialized Views Work with Object Types and Collections

This is extract from Oracle10g Advanced Replication Book.

How Materialized Views Work with Object Types and Collections

Oracle object types are user-defined datatypes that make it possible to model complex real-world entities such as customers and orders as single entities, called objects, in the database. You create object types using the CREATE TYPE ... AS OBJECT statement. You can replicate object types and objects between master sites and materialized view sites in a replication environment.

An Oracle object that occupies a single column in a table is called a column object. Typically, tables that contain column objects also contain other columns, which may be built-in datatypes, such as VARCHAR2 and NUMBER. An object table is a special kind of table in which each row represents an object. Each row in an object table is a row object.

You can also replicate collections. Collections are user-defined datatypes that are based on VARRAY and nested table datatypes. You create varrays with the CREATE TYPE ... AS VARRAY statement, and you create nested tables with the CREATE TYPE ... AS TABLE statement.

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