What is the transaction in Hibernate?
A transaction simply represents a unit of work. In such case, if one step fails, the whole transaction fails (which is termed as atomicity). A transaction can be described by ACID properties (Atomicity, Consistency, Isolation and Durability).
What are the Hibernate interview questions?
Hibernate Interview Questions For Freshers
- What is ORM in Hibernate?
- What are the advantages of Hibernate over JDBC?
- What are some of the important interfaces of Hibernate framework?
- What is a Session in Hibernate?
- What is a SessionFactory?
- What do you think about the statement – “session being a thread-safe object”?
What is lazy loading in Hibernate interview questions?
Lazy loading in hibernate improves the performance. It loads the child objects on demand. Since Hibernate 3, lazy loading is enabled by default, and you don’t need to do lazy=”true”. It means not to load the child objects when the parent is loaded.
Which second level cache is better in Hibernate?
Hibernate Second Level Cache
| Implementation | read-only | nonstrict-read-write |
|---|---|---|
| EH Cache | Yes | Yes |
| OS Cache | Yes | Yes |
| Swarm Cache | Yes | Yes |
| JBoss Cache | No | No |
How Hibernate sessions work?
A Session is used to get a physical connection with a database. The Session object is lightweight and designed to be instantiated each time an interaction is needed with the database. Persistent objects are saved and retrieved through a Session object.
What is transaction rollback in Hibernate?
When you call transaction. rollback() , Hibernate rolls-back the database transaction. Database handles rollback, thus removing newly created object.
What is dirty check in Hibernate?
Dirty checking is an essential concept of Hibernate. The Dirty checking concept is used to keep track of the objects. It automatically detects whether an object is modified (or not) or wants to be updated. It also allows a developer to avoid time-consuming database write actions.
What is transaction in hibernate?
In hibernate framework, we have Transaction interface that defines the unit of work. It maintains abstraction from the transaction implementation (JTA,JDBC). A transaction is associated with Session and instantiated by calling session.beginTransaction () .
How Hibernate interview questions can help in cracking interview?
It’s used a lot in enterprise applications for database operations. So I decided to write a post about hibernate interview questions to brush up your knowledge before the interview. Whether you are fresher or experienced, having good knowledge or Hibernate ORM tool helps in cracking interview.
Is it better to rollback the transaction in hibernate?
In hibernate, it is better to rollback the transaction if any exception occurs, so that resources can be free. Let’s see the example of transaction management in hibernate.
What is session BeginTransaction in hibernate?
Hibernate keeps a log of every data exchange with the help of a transaction. Thereon, in case a new exchange of date is about to get initiated, the function Session.beginTransaction is executed in order to begin the transaction. 4. Where is object/relational mappings defined in Hibernate?