Chapter 8 Quiz

Lakukan tugas rumah & ujian kamu dengan baik sekarang menggunakan Quizwiz!

All of the following are valid datatypes in Oracle 12c EXCEPT: VARCHAR2. BOOLEAN. NUMBER. BLOB.

BOOLEAN.

Denormalization is the process of transforming relations with variable-length fields into those with fixed-length fields.

False

T/ F: A database management system needs to provide only three basic facilities for backup and recovery of a database: backup facilities, journalizing facilities, and a recovery manager.

False

T/ F: Database applications are not very disk intensive.

False

T/ F: Free range partitioning is a type of horizontal partitioning in which each partition is defined by a range of values for one or more columns in the normalized table.

False

T/ F: The Number datatype would be appropriate for a zip code.

False

T/ F: There are two principal types of authorization tables: one for subjects and one for facts.

False

T/ F: Horizontal partitioning is very different from creating a supertype/subtype relationship.

False

Which type of file is easiest to update? Indexed Clustered Hashed Sequential

Hashed

Which of the following is an objective of selecting a data type? Represent a small number of possible values Limit security Improve data integrity Maximize storage space

Improve data integrity

________ is used to undo unwanted database changes. Rollforward Encryption Rollback Restart

Rollback

Hash partitioning spreads data evenly across partitions independent of any partition key value.

True

T/ F: A typical cause of database destruction is a disk crash.

True

T/ F: Along with table scans, other elements of a query can be processed in parallel.

True

T/ F: Broad network access is a characteristic of cloud computing.

True

T/F: A hashing algorithm is a routine that converts a primary key value into a relative record address.

True

T/F: A view can be built to present only the data to which a user requires access.

True

All of the following are common denormalization opportunities EXCEPT: two entities with a one-to-one relationship. a many-to-many relationship with nonkey attributes. a one-to-many relationship. reference data.

a one-to-many relationship.

A method that speeds query processing by running a query at the same time against several partitions of a table using multiprocessors is called: perpendicular query processing. multiple partition queries. parallel query processing. query optimization.

parallel query processing.

Database access frequencies are estimated from: random number generation. user logins. security violations. transaction volumes.

transaction volumes.

Forward recovery is faster than restore/rerun because: transactions do not have to be repeated. images are mirrored. security can be avoided. systems are more complete.

transactions do not have to be repeated.


Set pelajaran terkait

EAQS Chapter 16 Nurse Assessment

View Set

AP Computer Science Principles Semester 1 Study Guide

View Set

Microbiology Chapter 8: Microbial Metabolism

View Set

B2-CLOSE UP unit 9-And What Do You Do?

View Set

Prep U Practice Questions (Tissue Integrity)

View Set

Vocabulary Workshop Level D Unit 5

View Set

Acct 3220 - Taxation Midterm Ch2

View Set

Christian Theology Exam 1 Whitlock

View Set