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Materialized View Replication in Database Systems

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Materialized View Replication in Database Systems

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Questions and Answers

What is the primary purpose of creating a materialized view?

To support mobile computing applications with offline data access

To enable data synchronization across multiple databases

To improve query optimization by reducing the number of joins

To provide a snapshot of data for reporting and analysis (correct)

How does Oracle Database handle a query on a view?

It merges the view and query definitions to construct a new query (correct)

It uses data synchronization to ensure data consistency across databases

It uses data replication to retrieve data from multiple sources

It executes the view definition and then applies the query filter

What is the benefit of using object views in Oracle Database?

It supports mobile computing applications with offline data access

It enables data replication and synchronization across multiple databases

It allows for prototyping and transitioning to object-oriented applications (correct)

It improves query optimization by reducing the number of joins

What is the primary difference between a view and a materialized view?

A view is a virtual table, while a materialized view is a physical table (A) Signup and view all the answers

What is the purpose of the OBJECT IDENTIFIER clause in an object view?

To specify the primary key of the object table (C) Signup and view all the answers

How does an object view differ from a regular view?

An object view represents a single object, while a regular view represents a table (A) Signup and view all the answers

What is the benefit of using materialized views in a data warehouse?

It provides fast query response times for complex queries (B) Signup and view all the answers

What is the primary use of object types in Oracle Database?

To define a data type for an object view (D) Signup and view all the answers

What is the purpose of creating a view based on multiple tables?

To provide a single interface for accessing data from multiple tables (B) Signup and view all the answers

What is the benefit of using views in Oracle Database?

It provides a layer of abstraction between the user and the underlying tables (B) Signup and view all the answers