Spring Boot Transaction Management Concepts 3

Question 1

What does the NESTED propagation behavior do when there is an existing transaction?

Accepted Answer

Uses a savepoint within the existing transaction allowing partial rollback

Answer

NESTED creates a savepoint within the existing transaction so the nested operation can be rolled back independently without affecting the outer transaction.

Question 2

When using Spring Boot with Spring Data JPA, which transaction manager is auto-configured?

Accepted Answer

JpaTransactionManager

Answer

Spring Boot auto-configures JpaTransactionManager when spring-data-jpa is on the classpath and an EntityManagerFactory is present.

Question 3

What is a 'phantom read' in database transactions?

Accepted Answer

A query returning different sets of rows due to inserts by another concurrent transaction

Answer

A phantom read happens when a transaction re-executes a range query and sees new rows inserted by another committed transaction.

Question 4

How can you configure @Transactional to roll back on a specific checked exception?

Accepted Answer

Use rollbackFor = CheckedException.class

Answer

The rollbackFor attribute accepts exception classes and instructs Spring to roll back the transaction when those exceptions are thrown.

Question 5

Which isolation level prevents dirty reads and non-repeatable reads but still allows phantom reads?

Accepted Answer

REPEATABLE_READ

Answer

REPEATABLE_READ prevents dirty and non-repeatable reads by locking read rows, but does not prevent phantom reads from new row insertions.

Spring Boot Practice Test

Spring Boot Practice Test

Spring Boot Transaction Management Concepts 3