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Oracle Indexes and Clusters Overview

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Questions and Answers

What is the purpose of indexes in Oracle databases?

Store data separately from the indexes

Automatically update indexes after new data is inserted (correct)

Use indexes only for queries and not for other SQL statements

Manually manage the indexes for each table

How does clustering help in boosting performance of join queries?

By storing related data in separate disk pages

By storing related data together on the same disk page (correct)

By creating multiple cluster indexes

By spreading data to different disk areas

What is a cluster column in Oracle databases?

A column that stores data separately from the cluster tables

A common column with the same data type and size in cluster tables (correct)

A column that is unique and indexed

A column that requires additional storage space

Which statement about cluster indexes is true?

Cluster indexes require additional storage space Signup and view all the answers

How are indexes used by Oracle databases in SQL statements?

Indexes are used for all SQL statements to find records Signup and view all the answers

What happens to index usage if columns referenced in the WHERE clause have indexes?

Oracle automatically uses those indexes when appropriate Signup and view all the answers

What is the first step in creating clustered tables?

Create a Cluster Signup and view all the answers

What is stored in an index segment in Oracle?

Cluster Index Signup and view all the answers

What happens if a cluster index is dropped?

Data in the cluster remains but cannot be accessed Signup and view all the answers

Can existing tables be moved into a cluster?

No, tables have to be explicitly created under the cluster Signup and view all the answers

In a cluster index, how many entries are there per cluster key value?

One entry per cluster key value Signup and view all the answers

What is required to access data in cluster tables?

A Cluster Index Signup and view all the answers