Database Systems Quiz

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Questions and Answers

What occurs in a relation when records are added or removed?

The number of domains changes.

The degree of the relation is fixed but the cardinality varies.

The cardinality of the relation is fixed but the degree varies. (correct)

The attributes in the domain change.

What database protection technique should be employed to prioritize security over processing speed?

Integrity controls

Backups

Encryption (correct)

User views

What is a composite key?

A primary or foreign key defined by its parent keys.

A foreign key that consists of the same attributes as the primary key from a related table.

A primary key that consists of the first two attributes of a relation.

A primary or foreign key that consists of two or more attributes of a relation. (correct)

What process is used to prevent the current database operation from reading or writing a data item while it is being accessed by another operation?

Lock Signup and view all the answers

Which of the following is NOT a characteristic of file-based database systems?

Data independence Signup and view all the answers

What is the correct order of the database design activities?

4, 3, 2, 1 Signup and view all the answers

Why is encryption used in a database system?

To enhance data security Signup and view all the answers

What is the main advantage of using a database management system?

All of the above Signup and view all the answers

What is the term that describes the management of simultaneous transactions to prevent conflicts?

Concurrency control Signup and view all the answers

When would the DBMS use a serial schedule to execute transactions?

Concurrent transactions read or write the same data structure. Signup and view all the answers

What is the correct ordering of activities by assigned numbers?

1,2,3,4 Signup and view all the answers

What is a characteristic that applies to all types of databases?

Data that is stored in a structured manner Signup and view all the answers

What is an entity in the context of databases?

An item about which information is stored Signup and view all the answers

What is white-box testing of software?

The database designer tests the software because they are able to make necessary changes to the underlying code. Signup and view all the answers

Which SQL language is used to limit access to a database or its data?

Data Control Language Signup and view all the answers

What is a data dictionary?

A system catalog containing user data Signup and view all the answers

Which subset of Structured Query Language (SQL) is used to perform operations such as data retrieval or deletion?

Data Manipulation Language Signup and view all the answers

What is the primary function of concurrency control in a database?

To manage simultaneous transactions to prevent conflicts Signup and view all the answers

Which area of database security involves maintaining access to enterprise data?

Availability Signup and view all the answers

What type of testing involves testing the software with knowledge of the underlying code?

White-box testing Signup and view all the answers

How do you remove alteration privileges from a group of users?

REVOKE INSERT, UPDATE, DELETE ON Employees FROM Group_2; Signup and view all the answers

What mechanism provides controlled access to the database through virtual tables?

View Signup and view all the answers

What is the term for a database application that has entered the testing phase?

QA-ready Signup and view all the answers

Which database architecture is best suited for implementation in the World Wide Web environment?

Three-tier using thin client Signup and view all the answers

What type of entity-relationship model lacks redundant data?

Normalized relations Signup and view all the answers

What is a database operation that is executed as a single unit?

Transaction Signup and view all the answers

Which type of tables should triggers avoid referencing?

Very large tables Signup and view all the answers

What type of partitioning is suitable for reducing backup volumes?

Range Partitioning Signup and view all the answers

What feature should be omitted from a highly available data warehouse design?

Global nonpartitioned indexes Signup and view all the answers

Which two features provide fine-grained access control?

Advanced Security Option and Oracle Database Vault Signup and view all the answers

Which security feature allows access control based on values in individual records?

Oracle Label Security Signup and view all the answers

What is required for instance recovery after a power outage?

Inactive and current redo log files Signup and view all the answers

What is required to accomplish instance recovery?

Online and archived redo files Signup and view all the answers

What happens to the SKD user after the command SQL>ALTER USR skd ACCOUNT LOCK; is executed?

The user cannot log in to the database instance Signup and view all the answers

In which database state would you need to be to re-create the control files?

MOUNT Signup and view all the answers

What is Possession in the context of Access Management?

Not a concept within the Access Management process Signup and view all the answers

What is an Alert in the context of IT service management?

A warning that a threshold has been reached Signup and view all the answers

What is the purpose of creating intermediate entities during logical database design?

To resolve complex, recursive, and many-to-many relationships Signup and view all the answers

Which process is responsible for recording relationships between service components?

Service Asset and Configuration Management Signup and view all the answers

What is the effect of the command SQL>ALTER USR skd ACCOUNT LOCK; on the objects owned by the SKD user?

The objects are accessible to other users with permission Signup and view all the answers

Study Notes

Database Concepts

When records are added or removed from a relation, the degree of the relation varies, but the cardinality remains fixed.
To prioritize security over processing speed, encryption protection technique should be employed.

Database Security

Composite key is a primary or foreign key that consists of two or more attributes of a relation.
To prevent simultaneous database operations from reading or writing a data item, the lock process is used.
Data dictionary is metadata that is stored in tables and is only accessible by the DBMS.

Database Design

In database design, entities are items about which information is stored.
normalization is applied before determining entities.
Designing user views is a later step in the database design process.

SQL and Database Management

Data Control Language (DCL) is a subset of SQL used to limit access to a database or its data.
REVOKE command is used to remove privileges from a user or group.
Views provide controlled access to the database through virtual tables.

Database Architecture

Three-tier architecture using thin client is suitable for the World Wide Web environment.
Concurrency control is the management of simultaneous transactions to prevent conflicts.

Transactions and Control

Serialization ensures that transactions are executed in a predictable order to prevent conflicts.
A serial schedule is used when concurrent transactions read or write the same data structure.
A transaction is a single unit of one or more database operations.

Testing and Quality Assurance

White-box testing involves testing the software with knowledge of the underlying code.

Partitioning and Data Warehousing

Range Partitioning is suitable for scenarios where older data does not need to be backed up frequently.
Partitioning and RAC (Real Application Clusters) are features that provide high availability.

Database Administration

Redo log files are required for instance recovery after a power outage.
The ALTER USR command with ACCOUNT LOCK option locks a user account.

Access Management and Security

Identity, Rights, and Access are concepts within the Access Management process.
An alert is a warning that a threshold has been reached, something has changed, or a failure has occurred.

Database Design and Modeling

Intermediate entities are created during logical database design to resolve complex, recursive, and many-to-many relationships.

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Description

Test your knowledge of database systems, including relations, cardinality, and security techniques.