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Database Transactions and Concurrency Control

Authored by Quiambao Michael

Science

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Database Transactions and Concurrency Control
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55 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is a transaction in a database?

A collection of operations that form a single logical unit of work

A request to read or write data in a database

A constraint specified in the database schema

A log used to track database updates

2.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

Which of the following is an example of a transaction?

Writing a new customer's invoice

Updating the sales in a database

Reducing the quantity of on-hand products in inventory

All of the above

3.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is a database request equivalent to in an application program or transaction?

A single SQL statement

A collection of SQL statements

A database update

A database query

4.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is a database consistent state?

A state where all data is up-to-date

A state where all data is accurate

A state that satisfies the constraints specified in the schema

A state that allows concurrent transactions

5.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is the purpose of a transaction log in a DBMS?

To keep track of all the transactions that update the database

To store the database schema

To ensure data consistency

To prevent deadlock

6.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

Which property of transactions ensures that all operations of a transaction are completed?

Atomicity

Consistency

Isolation

Durability

7.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What does the consistency property of transactions ensure?

Only valid data following all rules and constraints will be written in the database

Data used during the execution of a transaction cannot be used by another transaction

Once transaction changes are done and committed, they cannot be undone or lost

All operations of a transaction should be completed

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